Why India doesn’t lose forest cover
Despite deforestation and human
encroachment, the country’s forest cover has remained stable around 20% since
Independence. This is because the loss of natural old-growth forests is
compensated on paper by expanding monoculture plantations.
Since Independence, a fifth of India’s land has consistently been under
forests. The population has increased more than three times since 1947, and
from 1951-80, a total 42,380 sq km of forestland was diverted — some 62% of it
for agriculture. And yet, the country’s forest cover continues to hover just
over 20%.
The India State of Forest Report 2017, released by the Forest Survey of
India recorded that the forest cover had increased by 6,600 sq km — 0.21% —
since 2015. For the first time since
2007, the biennial report recorded an increase of 5,198 sq km in “dense forest”
(including Very Dense Forest, with a tree canopy density of 70% and above;
and Moderately Dense Forest, with a tree canopy density of 40% and more, but
less than 70%)
It’s green, but is it forest? Given the relentless pressure on
forestland, what makes such stability, even growth, in forest cover possible?
One, the FSI uses satellite images to identify green cover as forest, and
does not discriminate between natural forests, plantations, thickets of weeds
such as juliflora and lantana, and longstanding commercial crops such as palm,
coconut, coffee, or even sugarcane
Two, in the 1980s, satellite
imagery mapped forests on a scale of 1:1 million, and thus missed details of
land units smaller than 4 sq km. The significantly refined 1:50,000 scale now
scans patches as small as 1 hectare (100 m x 100 m), and any unit that shows a
10% canopy density is considered ‘forest’. So, millions of tiny plots that earlier went unnoticed, now contribute to
India’s official forest cover.
Highly agricultural Punjab and
Haryana have managed to add more than 1,000 sq km each of forests since the
1980s.
More losses than gains
A dense forest (40% or more canopy density) can deteriorate into open forest (10%-40% canopy density) or
can be wiped out all together, becoming ‘non-forest’. And open forests can
improve in density, non-forests can grow into open forests and, over time, into
dense forests.
Over the last one and a half
decades (2003 onwards), 15,920 sq km of dense forests have become non-forest
areas. What partially offsets this loss on paper is the conversion of
non-forest areas to dense forest every two years. Since 2003, a total of 8,369
sq km of non-forest have become dense forest.
In the last two years alone, this
has added 3,600 sq km under the dense forest category.
But how could these areas with no forest become dense forests in just
two years?
The answer: these are all fast-growing plantations — not detected
by satellites in the sapling stage, but considered dense forests once they’ve
grown.
Since 2003, India has lost over 1,000 sq km of dense forest every year, and
compensated roughly half of that with plantations. Between 2005 and 2007,
2,206 sq km of dense forest were destroyed. A decade later, while the FSI
claimed an impressive biennial overall jump in dense forest cover, we actually
wiped out nearly thrice as much — 6,407 sq km — of dense forest between 2015
and 2017.
Forestland without forests
The extent of the loss can be
estimated from the fact that much of what is forestland on paper has little or
no forest on it. Combining digitised data available from 16 states with the
Survey of India’s topographic maps of greenwash areas (forestland) from the
rest, the FSI identified 7,06,899 sq km as recorded forest area in India. Of
this, the 2017 report says, 1,95,983 sq km — nearly 28% — has no forest cover
at all, and only 3,26,325 sq km — about 46% — is densely forested.
In other words, forestland roughly the size of Gujarat has
been wiped clean of forests. Also, less
than half of India’s forestland is dense forest. If almost 600 sq km of
this forest-land-without-forests became forested between 2015 and 2017, the bad
news is that over 1,000 sq km of forestland lost dense cover during the same
period.
Indeed, the forest data is less
than the sum of its parts. After four decades of surveys, it is probably time for the FSI to consider
reporting India’s green cover under more explicit categories, including
plantations, orchards etc. It could also help to make the GPS data for each
forest unit available for public audits.
No comments:
Post a Comment