FAQ: Rainforests of India: Ecology, biodiversity, policy and livelihoods

India's tropical rainforests are distributed across four distinct geographic zones, each defined by unique rainfall patterns, plant diversity, and evolutionary history.

The  Western Ghats, a mountain range extending approximately 1,600 kilometres along India's western coast from Gujarat to Kerala, host the country's most extensive mainland rainforests. These forests are concentrated in regions such as Wayanad, Coorg, Agasthyamalai, and the Anamalai Hills, which receive between 2,000 and 7,000 millimetres of annual rainfall. The Andaman and Nicobar Islands, comprising 572 islands in the Bay of Bengal, of which around 38 are inhabited, support some of the most pristine evergreen and semi-evergreen rainforests in India. Many of these forests remain intact because of restricted civilian access.

North-east India, encompassing Arunachal Pradesh, Assam, Meghalaya, Nagaland, Manipur, Mizoram, and Tripura, forms part of two global biodiversity hotspots: the Eastern Himalayas and Indo-Burma. The region receives some of the highest rainfall recorded anywhere on Earth. Mawsynram and Cherrapunji in Meghalaya regularly compete for the title of the world's wettest place, according to the India Meteorological Department.

Odisha retains small but ecologically significant rainforest remnants in the Eastern Ghats districts of Koraput, Malkangiri, and Rayagada. Although often overlooked, this region serves as an important ecological link connecting the forest lineages of the Deccan Plateau and northeastern India.

India hosts ecosystems that closely resemble temperate rainforests, although their classification remains scientifically debated. Many ecologists prefer terms such as subtropical montane moist forest or Himalayan temperate moist forest.

These forests are found primarily in the higher elevation zones of the Eastern Himalayas, including Sikkim, especially the Khangchendzonga Biosphere Reserve, a UNESCO World Heritage Site, the Darjeeling and Kalimpong hills of northern West Bengal, and the western valleys of Arunachal Pradesh. They typically occur between elevations of 1,800 and 3,500 metres.

Temperate forests differ from tropical rainforests in several important ways. They are dominated by oaks such as Quercus lamellosa and Quercus semecarpifolia; rhododendrons, with more than 30 species recorded in Sikkim alone; magnolias; alders; and conifers, including Abies densa and Tsuga dumosa. In contrast, tropical rainforests are characterised by dipterocarps, fig trees, and other lowland tropical species.

Temperatures in these forests rarely exceed 20 degrees Celsius even during summer. Persistent cloud cover sustains extraordinary communities of epiphytes, including mosses, liverworts, lichens, and orchids that cover tree branches. Annual precipitation ranges from 2,000 to 4,000 millimetres, supplemented by snowmelt.

Biodiversity patterns also differ. Temperate forests generally support fewer species per unit area than tropical forests, but they harbour exceptionally high numbers of cold-adapted endemic species. These include the red panda (Ailurus fulgens, Endangered), listed as Endangered, the Himalayan monal pheasant (Lophophorus impejanus); and numerous endemic primula, gentian, and rhododendron species. The structural complexity of these forests, characterised by multiple vegetation layers, dense moss carpets, fallen logs, and boulder fields, creates habitat niches rarely found in tropical forests.

The term 'biodiversity hotspot' was coined by ecologist Norman Myers in a 1988 paper in The Environmentalist and has a precise scientific definition. To qualify, a region must contain at least 1,500 endemic vascular plant species, representing more than 0.5 percent of the world's total, and must have lost at least 70 percent of its original habitat. Only 36 regions globally qualify these criteria.

The Western Ghats are among the world's eight "hottest hotspots", regions with the most extreme combination of endemism and habitat loss. The region supports more than 5,000 flowering plant species, of which about 1,700 are endemic. It is home to 139 mammal species; 508 bird species, including 19 endemic species; 179 amphibian species, with roughly 65% endemism, among the highest amphibian endemism rates anywhere in the world; and more than 290 freshwater fish species.

In 2012, the UNESCO World Heritage designation of 2012 designated 39 sites across six states in the Western Ghats as World Heritage properties.

The Western Ghats also function as one of India's most important water towers. They form the watershed for more than 50 rivers, including the Cauvery, Godavari, Krishna, and Periyar, making the region critical for the freshwater security of an estimated 400 million people downstream.

However, hotspot status also carries a warning. Having already lost more than 70 percent of its original habitat, the Western Ghats is no longer a pristine wilderness. Conservation here involves managing fragmented and stressed landscapes under constant pressure from human activities, requiring approaches very different from those used in large intact protected areas.

Tropical and montane rainforests are among the most carbon-rich terrestrial ecosystems on Earth. India's evergreen forests store an estimated  100–250 tonnes of carbon per hectare in above-ground biomass alone, compared with roughly 60 to 80 tonnes per hectare in temperate forests. Significant carbon reserves are also stored in soils, dead wood, and root systems.

Forests in Arunachal Pradesh and the wider north-east are estimated to sequester approximately 35 million tonnes of carbon dioxide equivalent annually, according to assessments reviewed by the Indian Council of Forestry Research and Education (ICFRE). The India State of Forest Report 2023 estimated the country's total forest carbon stock at 7,204 million tonnes of CO₂ equivalent in ISFR 2023.

The Western Ghats also play a crucial role in regulating regional climate through atmospheric moisture recycling. Research from the Indian Institute of Science (IISc), including a  2015 study in Nature Climate Change, found that deforestation in the Western Ghats reduces moisture recycling and is linked to declining rainfall across the Deccan Plateau, 200 to 400 kilometres inland. This relationship affects millions of farmers who depend on rain-fed agriculture.

The forests of the Andaman and Nicobar Islands provide another vital climate service through coastal protection. Mangrove forests and littoral vegetation absorb storm surges and reduce wave energy during cyclones. Their importance became especially evident during the 2004 Indian Ocean tsunami, when villages protected by intact coastal forests experienced significantly lower mortality. This finding, documented in a 2005 paper in Science by Danielsen and colleagues, helped draw global attention to mangrove conservation as an essential climate adaptation strategy.

Indian rainforests harbour endemic species across every taxonomic group, many with no surviving populations anywhere else on Earth. In the Western Ghats, the lion-tailed macaque (Macaca silenus, Endangered), with fewer than 2,500 mature individuals remaining, is confined to fragments of Shola forest in Kerala and Karnataka. The Nilgiri tahr (Nilgiritragus hylocrius, Endangered) survives on high-altitude grassland forest edges, and a 2023 WII (Wildlife Institute of India) census estimated approximately 3,122 individuals remaining. The  purple frog (Nasikabatrachus sahyadrensis), described only in 2003 in Nature, spends almost its entire life underground and surfaces for only about two weeks during the monsoon to breed. Its closest known relative is a frog found in the Seychelles, providing evidence of the ancient Gondwana landmass connection.

In the Andaman and Nicobar Islands, the Narcondam hornbill (Rhyticeros narcondami, Vulnerable) exists only on Narcondam Island, a single dormant volcano covering just 6.8 square kilometres. The  Nicobar pigeon (Caloenas nicobarica, Vulnerable) is the closest living relative of the extinct dodo. The islands' biogeographic links with the Sundaland hotspot mean that many species are more closely related to Southeast Asian fauna than to species found on mainland India.

In north-east India, the  western hoolock gibbon (Hoolock hoolock, Endangered), India's only ape, is restricted to forests north of the Brahmaputra and has an estimated population of fewer than 12,000 individuals. The clouded leopard (Neofelis nebulosa, Vulnerable) and the Namdapha flying squirrel (Biswamoyopterus biswasi), known from only a single specimen collected in 1981, reflect the region's extraordinary and still poorly documented mammal diversity. The north-east also hosts more than 850 species of orchids, representing approximately half of India's total orchid flora. Indian rainforests harbour endemic species across every taxonomic group, many with no surviving populations anywhere else on Earth.

The two regions represent fundamentally different biogeographic histories, and understanding this distinction is essential for interpreting their conservation challenges, species composition, and management needs.

The Western Ghats are ancient Gondwanan remnants whose flora and fauna evolved in relative isolation as the Indian tectonic plate drifted northward across the Tethys Sea over the past 65 million years. This long period of isolation produced exceptionally high levels of endemism, meaning many species are found nowhere else on Earth. The purple frog (Nasikabatrachus sahyadrensis)  is a striking example. It descends from ancient lineages predating the breakup of Gondwana, and its closest living relative occurs in the Seychelles, nearly 4,000 kilometres away. Remarkably, the species was discovered only in 2003 despite living alongside humans for millions of years because of its almost entirely underground lifestyle.

Northeast India, in contrast, lies at the meeting point of the Indian, Indo Malayan, and Sino Himalayan biogeographic regions, functioning as a biodiversity corridor. The region shares strong floral and faunal connections with Myanmar, Yunnan, and mainland Southeast Asia. As a result, northeast India supports higher overall species richness, while the Western Ghats support higher levels of endemism, a distinction highlighted in the Critical Ecosystem Partnership Fund (CEPF) hotspot profiling assessments. Structurally, northeast forests are characterised by species such as  Hollong (Dipterocarpus macrocarpus), the state tree of Assam, extensive bamboo understoreys, and highly complex vertical forest layers shaped by strong altitudinal gradients.

Conservation pressures also differ substantially. The Western Ghats face pressures from agriculture, plantations, urban expansion, and infrastructure development within relatively established governance systems. North-east India's forests face additional challenges from international timber trade, cross border wildlife trafficking along the China-Myanmar corridor, customary land tenure systems that operate alongside formal state laws, and the complex political realities of areas affected by the Armed Forces Special Powers Act (AFSPA). These cross-border dynamics have been documented extensively in landscape assessments conducted by the Wildlife Institute of India.

Tropical rainforests operate through a remarkable ecological paradox. They are among the most productive ecosystems on Earth, yet they often grow on some of the poorest and most heavily leached soils, typically Oxisols and Ultisols in India's humid tropical regions. These soils are rich in iron oxides, reddish in colour, and generally low in plant-available nutrients.

Unlike many ecosystems where nutrients are stored in the soil, the nutrient capital of tropical rainforests is held primarily within living vegetation. Nutrients are continuously recycled through a rapid decomposition and uptake system driven by fungi, bacteria, soil invertebrates, and extensive fine root networks. This efficient recycling process ensures that nutrients are absorbed quickly before they can be washed away into groundwater, a mechanism described in Jordan (1985), Nutrient Cycling in Tropical Forest Ecosystems.

When forests are cleared, this biological nutrient pump collapses. Agricultural productivity on cleared rainforest land often declines within three to five years, leaving behind degraded lateritic crusts. India's experience with jhum, or shifting cultivation, in north-east India illustrates this process. Traditionally, fallow periods lasted between ten and fifteen years, allowing ecosystems sufficient time to recover. As documented by Ramakrishnan in Shifting Agriculture and Sustainable Development (1992), these longer fallow periods enabled nutrient replenishment and forest regeneration.

However, population pressures have shortened fallow cycles in many areas to just two to four years. The consequences include declining soil fertility, invasion by weeds, and severe land degradation from which neither agriculture nor forests can easily recover without active restoration efforts.

These forests also perform critical hydrological functions. Research published in the journal Hydrological Processes shows that intact forest cover in the Western Ghats can reduce peak flood discharge by 30 to 50 percent while maintaining dry season stream flows. Streams that remain perennial under forest cover often dry up within five to seven years following forest clearance.

The devastating Kerala floods of 2018, the worst experienced in nearly a century, were concentrated in districts where forest conversion to plantations had been particularly extensive. This relationship was highlighted in the Madhav Gadgil Western Ghats Ecology Expert Panel Report (2011), which recommended stronger restrictions on development in ecologically sensitive areas. Many of these recommendations, however, were subsequently diluted amid pressure from industrial and development interests.

The principal threats to India's rainforests operate across different timescales and institutional domains, making them particularly difficult to address simultaneously.

Agricultural conversion has historically been the single largest driver of forest loss. Tea, coffee, rubber, cardamom, oil palm, and banana plantations have replaced millions of hectares of rainforest, especially in the Western Ghats and north-east India. An important but often overlooked aspect of this transformation is that much of it was actively supported by the state during the twentieth century. Colonial Forest Department plantation programmes, post-independence land settlement schemes, and plantation financing through the National Bank for Agriculture and Rural Development NABARD-financed plantation schemes created institutional pathways for forest conversion that remain embedded within land revenue systems today.

Infrastructure development now represents one of the fastest-growing threats. Roads, dams, railways, and other linear projects fragment habitats and create what ecologists call edge effects. These are changes in temperature, humidity, light penetration, and invasive species pressure that can extend between 300 and 500 metres on either side of a clearance area. According to the Wildlife Institute of India (WII), road densities exceeding 0.4 kilometres per square kilometre within forest landscapes are associated with measurable declines in large mammal populations. The proposed expansion of the Char Dham highway in the upper Himalayas and the widening of National Highway 37 through Kaziranga National Park have both become subjects of legal challenges before the Supreme Court of India.

Invasive species create a more subtle but equally damaging threat. Lantana camara, an exotic shrub introduced during the colonial period, has invaded the understorey of an estimated 40 percent of India's forest landscapes. By preventing the establishment of native seedlings, it suppresses natural forest regeneration. Mikania micrantha, commonly known as the mile-a-minute weed, is now widespread across north-east India and the Andaman Islands, where it smothers native vegetation through shading and chemical interactions with surrounding plants.  Eichhornia crassipes, or water hyacinth, clogs wetland edges adjoining rainforest ecosystems, disrupting amphibian breeding habitats and altering aquatic ecological processes.

A critical point to recognise is that agricultural expansion, infrastructure development, and invasive species spread are not purely ecological problems. Each is enabled, directly or indirectly, by institutional structures such as government ministries, budget allocations, policies, and legal frameworks that permit or encourage these activities. Effective rainforest conservation therefore requires engagement with these institutions, rather than merely documenting the ecological consequences after they occur. The  MoEFCC- Ministry of Environment, Forest and Climate Change's Forest Clearance database provides a transparent record of approved forest diversion projects across India's forest landscapes, offering insight into the scale and distribution of these ongoing pressures.

Climate change impacts on Indian rainforests are already measurable across multiple biological dimensions. This is not a future risk but a process that is unfolding right now. One of the clearest signs is phenological disruption, or changes in the timing of flowering, fruiting, and leaf emergence. Across the Western Ghats, several tree species are now flowering two to four weeks earlier than herbarium records and field observations from the 1970s to the 1990s indicate. These shifts disrupt what ecologists call phenological synchrony, the timing relationships between trees and the pollinators and seed dispersers that depend on them. Research by Visser & Both (2005) in Proceedings of the Royal Society B describes this phenomenon as a phenological mismatch. When these ecological relationships become decoupled, reproductive success can decline even in the absence of direct habitat loss.

The Forest Conservation (Amendment) Act 2023, which amended the  Forest Conservation Act 1980, is widely regarded as the most significant change to India's forest governance framework in more than four decades. The law has attracted sustained criticism from ecologists, forest rights advocates, and legal scholars.

Its most consequential provision is the narrowing of the definition of forests eligible for legal protection. Under the 1980 Act, and following the Supreme Court's landmark 1996 T.N. Godavarman Thirumulpad judgment (WP No. 202/1995), all lands exhibiting forest characteristics were protected, regardless of whether they were officially recorded as forests in government land records. The 2023 amendment limits protection primarily to land recorded as forest in government records on or after October 25, 1980. This effectively removes the protection that the Godavarman judgment extended to millions of hectares of ecologically functional deemed forests, unclassified forests, and revenue forests.

The amendment also exempts several categories of projects from forest clearance requirements. These include land within 100 kilometres of international borders for strategic and security projects, linear infrastructure projects covering up to 0.10 hectares, ecotourism facilities and zoos within forest areas, and reconnaissance surveys conducted for resource prospecting.

Legal analyses by the Centre for Policy Research (CPR)  and the Legal Initiative for Forest & Environment (LIFE) argue that these exemptions create substantial carve-outs in rainforest landscapes of northeastern India, particularly near the China and Myanmar borders, where some of the country's most intact forests remain. The government, however, maintains that the amendments reduce regulatory ambiguity, streamline approvals for border infrastructure, and do not weaken core forest protections.

Indian rainforests are home to some of the world's most culturally and linguistically diverse indigenous communities. Their relationship with forests is not merely one of residence. These ecosystems have shaped their cultures, livelihoods, governance systems, and identities over thousands of years.

In the Western Ghats, major forest-dwelling communities include the Soligas of Karnataka's Biligiri Rangaswamy Temple Tiger Reserve, whose rights within tiger reserves were recognised through a landmark Supreme Court judgement in 2011 (WP (Civil) 109/2008). Other communities include the Irulas of Tamil Nadu and Kerala, who are licensed by the Tamil Nadu government for snake venom extraction, a biodiversity-based livelihood model documented by  ATREE. The Kanikar, Muthuvan, Paniya, Malayarayan, and Jenukuruba communities also maintain longstanding cultural and ecological ties to the forests of southern India.

North-east India is home to more than 200 distinct tribal groups, each with its own governance systems, customary institutions, and land tenure arrangements. The Khasi and Jaintia communities of Meghalaya manage forests through customary laws and clan-based community forests, a system documented by Khiewtam & Ramakrishnan (1993) in Forest Ecology and Management. In Nagaland, village councils exercise significant authority over forests under customary law. Nagaland community-managed forests account for more than 60 percent of the state's forest area.

The Andaman and Nicobar Islands are home to five Particularly Vulnerable Tribal Groups (PVTGs), representing some of the oldest continuously inhabited human populations outside Africa. The Sentinelese, estimated to number fewer than 100 individuals, are the world's only known uncontacted people who continue to actively resist outside contact. The Great  Andamanese population numbers fewer than 60 individuals. The Andaman Trunk Road, which passes through the Jarawa Tribal Reserve, has been the subject of a long-running legal and conservation debate because of its ecological and cultural impacts. These communities are not simply stakeholders in conservation. They are rights holders whose constitutional, cultural, and territorial claims are deeply intertwined with the future of India's rainforests.

The Scheduled Tribes and Other Traditional Forest Dwellers (Recognition of Forest Rights) Act 2006, commonly known as the Forest Rights Act (FRA), is among the most ambitious environmental and social justice laws enacted in India. It seeks to correct historical injustices faced by forest-dwelling communities by recognising their rights over forests and forest resources.

The Act recognises three major categories of rights. Individual Forest Rights (IFRs) grant rights over land cultivated for at least three generations before December 2005. Community Forest Rights (CFRs) recognise collective rights over shared forest resources. Community Forest Resource Rights (CFRRs), often regarded as the most transformative provision, give communities the legal authority to manage, protect, regenerate, and sustainably use entire forest landscapes. The Act also provides habitat rights for Particularly Vulnerable Tribal Groups (PVTGs) and recognises rights over traditional knowledge and customary practices.

Implementation, however, has been highly uneven across the country. According to Ministry of Tribal Affairs FRA progress data, only about 4.5 million claims had been recognised by 2023, despite estimates suggesting that between 10 and 15 million claims may be eligible. Rejection rates in states such as Gujarat, Maharashtra, and Odisha have exceeded 50 percent. Community Forest Resource Rights, which many experts consider the provision with the greatest conservation potential, have been implemented in only a small fraction of eligible villages, estimated at around 5 percent nationally by the Community Forest Rights Learning and Advocacy (CFR-LA) network

Several factors have slowed implementation. Forest departments often have institutional incentives to resist recognition of rights because it transfers authority from the department to local communities. Revenue departments frequently fail to update land records. Many gram sabhas lack the technical and administrative support needed to process claims effectively without assistance from civil society organisations.

The Act's vulnerability was highlighted in the 2019 Supreme Court order (WP 109/2008), which ordered the eviction of more than a million households whose claims had been rejected. The order was later stayed following widespread protests and public concern.

Despite these challenges, the FRA remains the most significant legal instrument available for simultaneously advancing social justice, indigenous rights, and community-based conservation in India's forests. However, it continues to face administrative obstacles and insufficient institutional support.

India's rainforest conservation framework is built upon several major laws and policies that address different aspects of forest governance. While these laws provide substantial legal protection, they often overlap, conflict, or suffer from weak implementation.

The Wildlife Protection Act 1972 (WPA), significantly amended in 2022, provides the legal basis for protecting wildlife and habitats. It establishes 106 national parks and 567 wildlife sanctuaries, covering roughly 5 percent of India's land area; prohibits hunting of protected species; and supports the operation of 54 tiger reserves under  Project Tiger  and the National Tiger Conservation Authority.

The Forest Conservation Act 1980 (FCA) requires central government approval before forest land can be diverted for non-forest purposes. The Environment Protection Act 1986 (EPA) enables the creation of Eco Sensitive Zones around protected areas, while the Supreme Court has directed that all protected areas should have a minimum 1 kilometre Eco Sensitive Zone. The Biological Diversity Act, 2002, implements India's obligations under the Convention on Biological Diversity through the National Biodiversity Authority and Access and Benefit Sharing mechanisms.

India also maintains 18 biosphere reserves, including Nilgiri, Agasthyamalai, Great Nicobar, and Nokrek, which seek to balance conservation and human use through integrated landscape management. The National Forest Policy 1988, sets a target of 33 percent forest cover for the country, compared with the current reported forest and tree cover of about 21.7 percent.

The greatest weakness lies not in the laws themselves but in implementation. India has one of the lowest forest officer-to-forest-area ratios in the world. Coordination between forest departments, revenue authorities, and tribal welfare agencies remains poor. The Comptroller and Auditor General's 2023 audit of the Ministry of Environment, Forest and Climate Change documented persistent shortcomings in enforcement, monitoring, and inter-agency cooperation. As a result, India possesses a relatively strong legal framework on paper, but conservation outcomes are often constrained by limited institutional capacity and weak implementation.

India joined 195 other countries in adopting the Kunming-Montreal Global Biodiversity Framework (GBF) at the Convention on Biological Diversity Conference of Parties in December 2022. Under the agreement, countries committed to protecting 30 percent of terrestrial and marine areas by 2030, an objective commonly known as the "30 by 30" target. Other commitments include halting human-induced extinction of threatened species, reducing biodiversity-harming pollution by 50 percent, and mobilising at least 200 billion US dollars annually for biodiversity conservation by 2030, including USD 30 billion per year in international support for developing countries.

At present, India's formal protected area network covers only about 5 percent of its land area, leaving a substantial gap between current protection levels and the 30 percent target. To bridge this gap, the government has proposed using the OECM (Other Effective Area-Based Conservation Measures) framework, which would include community-managed forests, sacred groves, Eco Sensitive Zones, and private conservation areas alongside conventional protected areas.

While this approach has international support, some conservation experts caution that it could lead to inflated protection figures if areas are counted without effective conservation outcomes or if overlapping categories are counted more than once. India updated its National Biodiversity Strategy and Action Plan (NBSAP) in 2024 to align national goals with the Global Biodiversity Framework. However, several civil society organisations, including Kalpavriksh and the Forum for Law, Environment, Development and Governance (FLEDGE), have pointed out that India accelerated forest clearances during 2022 and 2023, shortly after adopting the Framework. This has raised questions about policy consistency.

Ultimately, the credibility of India's biodiversity commitments depends less on the targets themselves and more on the reforms that support them. Strengthening forest governance, fully implementing the Forest Rights Act, improving enforcement, and reducing economic incentives for forest conversion will be essential if the country is to meet its international biodiversity commitments while protecting its remaining rainforests.

Several approaches are demonstrating genuine promise, though none has yet been scaled to match the magnitude of the threat. Community Forest Resource Rights under the FRA, where implemented, represent the most powerful conservation tool available in India. Documented successes include community forest protection in Mendha-Lekha village (Maharashtra), where the Gond community has halted commercial bamboo extraction and restored forest quality; and community-managed forests in Odisha's Nayagarh district, documented by the CFR-LA network. Landscape-scale corridor restoration is gaining traction in the Western Ghats, particularly in the Anamalai-Parambikulam-Palakkad corridor and Nilgiri-Wayanad landscape, where the Nature Conservation Foundation (NCF) and WWF India work with government agencies and private landholders to restore connected forest patches for elephant and tiger movement.

Ecological restoration using Assisted Natural Regeneration (ANR), removing invasive Lantana camara and allowing native species to regenerate from the soil seed bank, is proving significantly more cost-effective and ecologically superior to conventional plantations in degraded Western Ghats landscapes, per research in Restoration Ecology. Payment for Ecosystem Services (PES) pilots are being tested in Kerala's Periyar watershed – creating financial transfers from downstream water users to upstream forest communities.

On the science side, environmental DNA (eDNA) sampling and LIDAR-based remote sensing are enabling previously impossible fine-grained biodiversity mapping in inaccessible forest interiors. The CAMPA (Compensatory Afforestation Fund Management and Planning Authority) manages over Rs 66,000 crore in compensatory afforestation funds – a resource that, if directed towards ANR rather than monoculture plantations, could be transformative for rainforest restoration at scale.