Govt’s Claim of Rise in ‘Forest Cover’ is Misleading, Say Experts
There is an ongoing debate on the resolution of satellite imagery the government uses to conduct the forest survey.
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A misrepresentation of the word “forest cover” has led to a flawed government conclusion that India’s forests grew by 6,778 sq km or 1 percent – about the size of Sikkim–over two years to 2017, various experts told FactChecker.
This increase includes forests converted to commercial plantations, degraded and fragmented forests, and the health of these forests is gauged by satellite imagery of inadequate resolution, they said.
The increase in forests was part of the government’s response to a Parliament question on 6 April 2018, and was based on India’s state of forest report (ISFR), 2017, which defines “forest cover” as a 1-hectare (ha) area with a tree canopy of 10 percent or more.
“We do not make a distinction between natural forest or forest species in our definition of forest cover in the report,” Subhash Ashutosh, director general of the Forest Survey of India (FSI), the government organisation that wrote the ISFR report, told FactChecker.
“Despite the fact that other species were included, forest-cover expansion plays a positive environmental and ecological role,” he said. “It may not be similar to the role of a natural forest, but this is also significant from an environmental point of view.”
Ashutosh’s distinction was contested by various experts.
Govt’s Definition Of ‘Forest Cover’ Flawed: Experts
In 2015, “forest cover” nationwide increased by 3,775 sq km–-six times the size of Mumbai–-as compared to 2013, according to the State of Forests Report, IndiaSpend reported on July 27, 2017. This at a time when, globally, forest area (as a percentage of land area) decreased by a percentage point to 30.8 percent over 25 years to 2015, according to World Bank data.
“This ISFR 2017 data flies in the face of several reports of forest degradation in India, particularly because of de-notification, and other forms of development-related clearance,” said Bharath Sundaram, a forest researcher.
The number of districts sampled in the government survey of 2017 was higher than the number of districts sampled in 2015. The 2015 assessment covered 589 districts while ISFR 2017 covered 633 and this may have pushed up forest estimates, said Sundaram.
Indian remote-sensing satellites produce images with a resolution of 23.5 metres per pixel, too coarse to unequivocally identify small-scale deforestation based on expert opinion, as per Nature’s report. Instead it should use imagery with resolution of 5.8 m per pixel, it was suggested.
A 23.5-m resolution cannot distinguish state-owned forests, private forests, and community-managed forests, a move that is is “obviously political”, Sundaram alleged.
Ashutosh of the FSI acknowledged that current satellite imagery could not record plantations, but he said improving resolution was not immediately possible.
While it was possible to improve the resolution, that process could take between five and eight years, Ashutosh explained. “We process 323 scenes, with each scene, [spread across] around 19,000 sq km,” he said. “With higher resolution it will increase to 3,000-4,000 scenes, which will need more time to process and analyse.”
Plantation Growth Included In Forest Cover Expansion
Plantations grew by around 15,400 sq km a year between 1995 and 2005, according to a 2010 Nature report. It further found that native Indian forests declined by 1.5 – 2.7 percent over the same period, an average of 2.4 percent a year and a loss of more than 124,000 sq km over the decade.
“Taking flawed lessons from World Bank-inspired forestry policies, the government, against all advice, pushes for plantation of quick-growing tree species on fragile habitats like river banks, lakes, beaches and even semi-arid, and desert tracts where grasses and their associated species have survived for millennia,” Bittu Sahgal, editor of Sanctuary Asia, a nature and conservation magazine, told FactChecker.
Why Forests Are Important
The increase in forests is important to improving biodiversity and reducing damage caused by natural disasters like floods. States that have reported damage by floods had fewer forests compared to states that had reported less damage, IndiaSpend reported on September 22, 2017.
At the heart of the forest-cover debate is the definition and density of a forest.
15 States/Union Territories Are 33% Forest–Officially
Of the 21.5 percent of India categorised as “forest cover”, 9.3 percent and 9.1 percent is under “moderately dense” and “open forest”, respectively, as per the ISFR report. Only 2.9 percent is “dense forest”. These categories are based on densities of forest canopies (see definitions below table).
Up to a fifth (21 percent) of the 98,158 sq km of “very dense” forest is in Arunachal Pradesh, while Chhattisgarh has the highest percentage of “moderately dense” forest (10.4 percent), the ISFR report noted.
Categories used in these reports – very dense, dense, open, degraded, primary, etc – are debatable, noted Sundaram. “Given the complexity of forest types in India, it makes sense to move to the actual type of forest cover like evergreen, riparian, semi-deciduous, alpine, tropical dry deciduous, and so on,” he said.
“We have mapped forest types in an exercise conducted between 2005-10,” said Ashutosh of the FSI. “But this involves mapping, ground truthing, analysis etc, which cannot be done in two years. It’ll require more time.”
Forests sprawl over more than 33 percent of 15 states and union territories (UTs), of which seven states account for more than 75 percent of forest. Madhya Pradesh (2.3 percent) and Arunachal Pradesh (2 percent) have the highest proportion of forests as a percentage of national geographic area, while Lakshadweep (90.3 percent) Mizoram (86.3 percent) and Arunachal Pradesh (79.9 percent) have the most land covered by forests.
Loss In Forest Land and Degradation
The data do not take into account forest degradation in India. The Eastern Ghats, stretching from Odisha to Tamil Nadu and covering parts of Karnataka, are important because they support precious biodiversity. These mountains have lost 15.83 percent of their forests over 95 years, noted a February 2018 study by Indian Institute of Tropical Meteorology, University of Hyderabad, and Jawaharlal Nehru University.
The forest loss was 5.8 percent in the three decades ending 2005, highlighting the impact of forest fragmentation on biodiversity, Bhargav said, citing a study by ISRO scientists titled ‘National Assessment of Forest Fragmentation in India’. The study concluded that increased fragmentation in most of the biogeographic zones is due to deforestation.
Decline In Forest ‘Greenness’
There has also been a decline in the “greenness” of Indian forests between 2001 and 2014, as per this study by National Remote Sensing Centre, Hyderabad. “Greenness” is an index that determines the “vigour” of a forest and a decline indicates its vulnerability to degradation.
In July 2016, India enacted the Compensatory Afforestation Fund Act allocating Rs 41,000 crore ($6.2 billion) for the expansion of India’s forest cover from 21.34 percent to 33 percent. A large part of compensatory afforestation fund management and planning authority fund must be applied for consolidation of remaining forest blocks and not wasted on raising plantations, noted Bhargav.
(This article was first published on Fact Checker and has been republished here with permission)
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