Fire burns down all vegetation and leaf litter accumulated on forest floor. ©:Sanjay Gubbi
During the months of February and March this year, reports
about vast forest fires sprouted like radishes in south Indian media. It became
a hot topic. Fires blackened some protected areas in Karnataka; Nagarahole,
Bandipur, Shettihalli were on the forefront bringing the issue of fire
management into the vanguard of conservation debate. Forest fires act as an
important portent of the larger conservation problems due to its ecological and
socio-political angle. They perhaps give an insight of our relationship with
nature.
Forest Survey of India predicts that about 3.3 million
hectares of forests are annually affected by fires in India largely affecting
deciduous and scrub habitats and pine forests. India hosts parts of the four
biodiversity hotspots of the world; the Western Ghats, Himalayas, Indo-Burma
and Indian ocean islands. Unfortunately, fires threaten most parts of these
hotspots.
Causes
Tropical dry deciduous forests are most prone to fires due
to their vegetation characteristics. However, proximate causes of fires are neither
due to lightning nor bamboo rubbing, as popularly believed. Fires are intentionally
ignited.
Man tames landscapes to his advantages and one of the key
tools has been fire. Though in the modern times fires are set for reasons that are
varied, a widespread cause of human-induced forest fires is the vendetta
against forest department. Poachers, timber smugglers and others who hold a
grudge against the department use summer as an ideal opportunity to settle
scores.
Forest fires and livestock grazing are interwoven. Several
communities living on the borders of protected areas depend on livestock for
livelihood and other purposes. Cattle grazers set forests on fire to promote
growth of green fodder for their livestock.
Collectors of non-timber forest produce, popularly termed as
NTFPs, such as amla (Phyllanthus emblica), ink nut (Terminalia
chebula), Mahua flowers (Madhuca longifolia), deer antlers, lemon
grass (Cymbopogon grass) all set forests on fire to facilitate
collection of these products. The thick forest undergrowth obstructs clear
vision making collection of these products very difficult. Hence, the
collectors find the easier way out by burning the undergrowth and many times,
these fires go uncontrolled devastating large patches of forests. Sometimes
collectors of beedi leaves (Diospyros melanoxylon) set fires in the
belief that fire would enhance the growth and yield of leaves.
The causal factors of fire are generally similar across the
country with some regional variations. For instance, shifting cultivation (Jhum
cultivation) is no more prevalent in parts of the country but it still persists
in north-eastern area which is one of the important reasons of man-made forest
fires.
Religious congregations, festivals and fairs held inside
protected areas are a serious concern for fire protection. These annual events,
many of them coinciding with high fire risk period, are an important source of
forest fires. Bandipur Tiger Reserve in Karnataka is a typical example of this.
Over 10 large congregations happen within the tiger reserve annually with
several thousand people attending these events.
There are instances of self-goal as well; most times this is
due to negligence or by accident and unintentional. Managers as part of the
broad management strategy carry out controlled burning in the form of creation
of fire lines. Vegetation and leaf litter along forest roads and fire lines
that criss-cross the forests are burnt under controlled conditions to prevent
fires spreading from one area to another. Nevertheless, due to negligence or
untimely burning of these fire lines can also lead to destructive fires.
An agent of change
There is little argument about the various impacts of forest
fires on flora and fauna though hard core scientific evidence exists on a few
factors. Effects can be categorized as immediate or long-term, direct or
indirect impacts. But all of these effects indeed have a large impact on the
ecosystem. Even from an economic perspective, forest fires cause grave losses.
Ministry of Environment and Forests estimates about $110 million worth of
forests being lost to fires annually in India.
Fires destabilize the system locally. However the
destructive power of fire is perhaps instantly and glaringly seen on
vegetation. Fires leave a doomsday image in the forests. Natural forests are
charred burning countless plants, trees and micro fauna causing a spurt in human-induced
ecological changes. Fires burn out seeds on the forest floor that would otherwise
be waiting for the rains to germinate, impacting tree groups that solely depend
upon seed germination for regeneration than those that can resprout clonally.
Similarly, tree seedlings are lost to fires. Both these severely affect forest
regeneration.
Repeated forest fires encourage the growth of fire hardy tree
species such as rosewood (Dalbergia latifolia), catechu (Acacia
catechu), Indian laburnum (Casia fistula), dog teak (Dillenia
pentagyna), dhaura (Anogeisus latifolia) and others. If we skip
ahead 50 years, the picture changes and the forests will be forced to
monoculture negatively affecting species diversity and forest composition. There
are adequate and appropriate scientific evidences that demonstrate the decrease
in endemic species as fire tolerant tree species increase in an area. Narendra
Kodandapani of the Asian Nature Conservation Foundation who has carried out
impact studies of fires on forest diversity estimates a reduction of tree
species by 60% in fire prone areas compared to areas with low fire frequency in
the tropical dry deciduous forests of the Nilgiri Biosphere Reserve.
This apart, juvenile trees get stunted for years gravely influencing
tree growth rates in areas that repeatedly suffer burning, encouraging stunted
forest understory. Invasive and exotic weeds such as lantana and eupatorium are
also promoted by fires.
Ground fires will kill forest regeneration and encourage fire hardy species in an area. ©Sanjay Gubbi
Though fire-induced mortality on faunal species is less
visible except for the occasional detection of carcass of smaller mammals, fires
should indeed be affecting young ones of large mammals such as tigers,
leopards, jungle cat, leopard cat, civets, martens who hide their young ones in
tree cavities. Similarly, woodpeckers, barbets, owls, parakeets and a host of
other bird groups that nest in tree holes or ground nesting birds such as
lapwings, pipits, nightjars, peafowl would see their eggs or young ones charred
in fires. The bigger, indirect impact is the loss of food sources and habitat for
larger fauna. Fire will burn out food sources of all herbivorous, granivorous,
insectivorous and other fauna. However, studies on these impacts are less
studied in our country.
Leaf litter accumulated through the year completely
decomposed and converted to nutrients are all lost due to raging fires. This leads
to loss of micro fauna that is so important in fixing nutrients affecting soil
quality and degrading overall eco-system.
Making forests fire safe
So, do we have answers to mitigate problems of forest fires?
As with several conservation related problems, answers are based on a
combination of factors. It may not be possible to bring forest fires to ground
zero; however, tragedies and large-scale fires are avoidable with preparedness
and timely interventions.
Traditional fire management practices, if well planned and
implemented, are the best mode of controlling forest fires. Timely
implementation of preventive measures such as fire lines that need to be burnt
during late winters when there is enough moisture in the vegetation is vital. Employing
fire control watchers at the appropriate time, watchmen equipped with wireless
stationed at high vantage locations to observe for any incidences of fires are
all components of good fire management practices.
Developing a rapport with communities on the immediate
vicinity of forests and other outreach activities can help to a large extent.
This is a place where conservation volunteers can play an important role. In
Karnataka, several interested youngsters belonging to groups such as Vanya,
Wildlife Matters, Aranya and others have been working in villages around
Biligirirangaswamybetta, Nugu, Nagarahole and Bandipur protected areas. With
the ending of winter, these youngsters in collaboration with forest department
toil in areas that are extremely hostile towards wildlife conservation. Results
for their efforts may not be obvious and instant; hopefully, in the long run it
should prove useful. There should be several other groups in other parts of the
country carrying out similar worthy tasks.
Civil societies that promote harvesting of NTFPs as
livelihood models should develop methodologies and educate communities on
practices that do not use fire for harvesting of NTFPs, wherever they are
legally allowed.
A very serious issue that normally goes unnoticed is linked
to the Government’s financial year. Unfortunately, high fire risk season
coincides with the ending of Governmental financial year (31st
March). Foresters are under pressure to meet their financial targets during these
months and the focus, leadership, manpower and management for fire control does
not take precedence. Hence funding for protected area management should arrive
in field level accounts in a timely manner or new policies need to be evolved
such that spending targets especially for protected areas are on different
timelines.
Does advanced technology help prevent forest fires? Advances
in technology have helped in monitoring fires both on a local and global scale.
It’s an important tool to analyse fires post burning than used for fire
prevention. Understanding spatial distribution, seasonal variation of fire
patterns can largely be done using technology. Remote Sensing and Geographical
Information System can help in identifying fire prone zones for development of
appropriate management regimes. But to remind these are gears to review and
evaluate retrospectively than to prevent fires.
One of the solutions promoted includes eradication of exotic
weeds such as Lantana. This issue is still largely debated even within the scientific
community with diverse views. In a recent publication in the reputed journal
Plos One, scientists of Oxford University suggest that removal of lantana is almost
next to impossible; hence, not offering solutions for fire prevention.
Managing fires is a hard task for field staff ©Sanjay Gubbi
Is black green?
Forest fires are one of the important ubiquitous threats as
our protected areas are abutted by high human densities, many of them with
antipathy towards conservation. From evidences, the trends and fire intervals
now seem quite predictable. So, are we learning the hard lessons from previous incidences?
Are we developing comprehensive fire management strategies? These are some of
the questions that arise every time major forest fire incidences occur. How to
manage fires should be science based argue some, a few say it has to be based
on socio-political issues and some bet their money on strict protection. Some even say fires are good for forests as it
burns down the fuel load preventing large scale fires.
Conservation science certainly has uncertainties with no
black and white answers. However, until we have strong evidences about various
questions the intelligentsia throw in, the ground rule remains the same; we
need to protect our forests from fires. While we discuss and contemplate as to
what are the most appropriate methods to handle the few biodiversity rich patches
that are locked in our national parks, wildlife sanctuaries and other
ecologically sensitive areas, they should be protected from the deleterious
effects of fires. Any outcomes of scientific debates can always be rooted into
the process once answers are out.
Some major fires in protected areas of Karnataka
Year
|
Location
|
Area burnt due to fires (ha)
|
1999
|
Nagarahole Tiger Reserve
|
9,008*
|
1999
|
Bhadra Tiger Reserve
|
2,500$
|
2004
|
Bhadra Tiger Reserve
|
446&
|
2004
|
Nagarahole Tiger Reserve
|
9,505*
|
2004
|
Bandipur Tiger Reserve
|
22,657+
|
2012
|
Nagarahole Tiger Reserve
|
3,912*
|
2012
|
Bandipur Tiger Reserve
|
2,267*
|
Sources: *K.Ullas Karanth/WCS-India/CWS, +Somashekar et
al. 2009, &Somashekar et al. 2008, $Krithi Karanth
2007
|