Despite consecutive years of extreme precipitation over short periods in the Nilgiri Biosphere, hardly any step has been taken to address ecological security
Thousands of trees lay dead and strewn around the western parts of the Nilgiri Plateau in southern India. Deep gashes scar ancient mountains, standing a stark contrast to the lush green vegetation that they otherwise support.
As conservationists and activists are fighting to protect forests and wilderness areas from being deforested, mined and diverted to developmental projects, there is another level of destruction happening to our last remaining wild spaces. Climate change is causing widespread collapse of ecosystems.
Carbon dioxide levels in the atmosphere hit a record-breaking 417 parts per million (ppm) in May 2020, highest inthreemillion years. Along with global warming caused sea level rise and the melting of polar ice caps and glaciers, the steep increase in greenhouse gas concentrations has led to a surge in the frequency of extreme climate events.
A region where climate change caused weather extremities are exceedingly apparent are the coastal plains and Western Ghats of southern India. In the last four years, this region has been affected by eight tropical cyclones and consecutive extreme rainfall events during the southwest monsoon periods of the last two years. These bouts of intense storms have been interspersed with periods of severe droughts, heatwaves, deficient and failed monsoons.
On August 8, 2019, the Avalanche and Emerald valley regions, which are part of the Kundha watershed, received an unprecedented 900 millimetre (mm) rainfall within 24 hours. It broke the record for the highest rainfall in Tamil Nadu, by nearly twice the amount. Over four days, the region experienced close to 2,500 mm rainfall.
To put this in perspective, Coimbatore, the nearest city in the plains of Tamil Nadu, receives 600 mm of rain annually. The Kundha watershed bore a deluge that was four times the annual rainfall amount, over just four days. The upper watershed of the Kundha river is a complex of several peaks above 2,400 m and broad deep valleys.
The river, which is a primary tributary to the Bhavani that feeds into the Cauvery, is fed by numerous streams and rivulets at the headwater sections. With the barraging downpour, nearly every stream and rivulet burst its course. Vast tracts of precious soil and shola ecology slipped away on either side of the watercourses.
Gone are the rich black soil layers topped with spongy humus that line the streams; washed away are the dark moss and wild balsam covered rocks that shaped the flow of every stream; lost are the thousands of shola trees, dwarf bamboo and forest kurinji (shrubs of blue flowers which covered the hills) that guarded the streams, saplings, ferns and orchids of the forest floor.
In place of these are deep cuts of gauged out Earth, revealing the underlying lateritic soil and rocks.
(Left) An Aerides ringens orchid growing on a shola tree; (Right)Neela-Kurinjior Strobilanthes kunthiana flowering in the grassland habitats of the Nilgiris. This spectacle takes place only once in 12 years.Photo: Godwin Vasanth Bosco
Shola-grassland mosaic in danger
The cloud forest ecology, known as sholas, grows along the folds and valleys of these mountains. They are old-growth vegetation and harbour several endemic and rare species of flora and fauna. These naturally confined forests are already some of the most endangered forest types because of habitat loss and destruction.
The recent episode of extreme precipitation caused landslides have dealt a telling blow on these last remaining forest tracts. What is even more shocking is that montane grassland stretches have also experienced large landslides.
The montane grasslands occur over larger portions of the mountains here, covering all the other areas that sholas do not grow in. Together, the shola-grassland mosaic is most adept at absorbing high rainfall amounts and releasing it slowly throughout the year, giving rise to perennial streams.
Over a year they can experience 2,500-5,500 mm of rainfall, which is intricately sequestered by complex hydrological anatomy that carefully lets down most of this water, using what is needed to support the ecology upstream.
The native tussock grasses are highly adapted to hold the soil strongly together on steep slopes. However, even this ecology is now giving way under pressure from extreme weather events.
The shola-grassland mosaic ecology cannot withstand the tremendously high amounts of rainfall (over 2,400 mm) that occur in significantly short periods (over four days). Worsening climate change is driving the intensity and frequency of extreme weather events, resulting in a level of ecosystem collapse, never witnessed before.
A massive landslide in one of the largest sholas in the Avalanche region, with hundreds of native trees and the stream ecology washed away. Photo: Godwin Vasanth Bosco
In the southwest monsoon season of 2018, unusually high rainfall over the highland districts of Idukki, Wayanad and Coorg caused hundreds of landslides. A predominant view was that this was primarily because of the indiscriminate construction of roads and proliferating concretisation of the hills.
However, even within the highly stable shola-grassland ecology, a large number of landslides occurred in spots with no apparent disturbance such as roads and pathways cut through them. This signifies that climate change has reached a level that is beyond the capacity of the ecosystem and land resilience.
What is causing the collapse of the last remaining wild spaces is the cumulation of every action that has contributed to the climate crisis. The actions invariably stem from places that have long lost their plant ecological cover the global urban-industrial-agricultural complex. There is no time to keep ignoring this primary cause.
If we overlook the main cause and only try to safeguard the last remaining wilderness areas from the more direct forms of destruction, they will be susceptible to climate change-related collapse. It is important that threats closer to the last remaining ecological spaces are also curtailed.
But despite the consecutive years of extreme precipitation over short periods in the Nilgiri Biosphere, hardly any step has been taken to address ecological security. Building regulations stand to get eased and road expansion works continue in full swing.
Till June-end, parts of Tamil Nadu experienced a 45 per cent deficiency in the monsoon. The trend is worryingly similar to what happened in the last two years when much of the annual rainfall was concentrated over a few days later in the monsoon period.
Destruction by dams and tunnels
The Kundha watershed region can be broadly divided into two the higher slopes and the descending valleys. Shola-grassland ecology dominates the higher slopes with various types of land uses such as tea cultivation, vegetable farming, villages and non-native tree plantations dominating the descending valleys.
An example of intact shola-grassland mosaic in the hills of the Nilgiri plateau, with the sholas growing in valleys and grasslands covering the slopes.Photo: Godwin Vasanth Bosco
The descending valleys are covered with several dams and hydroelectric structures. The Kundha Hydro-Electric Power Scheme is one of the largest hydropower generating installations in Tamil Nadu with 10 dams, several kilometres of underground tunnels and a capacity of 585 MW.This system is getting two more dams and a seriesof tunnels to set up a pumped storage hydropower facility, which is claimed to generate 1500 MW for peak hour demand but will expend 1800 MW in the process.
With the level of destruction that extreme precipitation events are bringing to the Kundha watershed, it is disastrous to add more large dams and tunnels. The intensity of floods has turned so strong that even the largest dam complexes in the world face threats of being breached.
Safeguarding the last remaining zones of ecology and biodiversity from threats of direct destruction is crucial. Concurrently, the larger worldwide urban-industrial-agricultural complex, from where the climate crisis stems from, needs drastic change. The constant incursions into more and more ecological spaces in the form of new dams, roads, and buildings are also connected to this complex.
Whether it is the landslides in the grasslands of the high elevation plateaus in southern India; the melting glaciers of the Himalayas in northern India; the dying coral and rising sea levels elsewhere in the planet; the COVID-19 pandemic that has brought about unimaginable changes we have to understand the interconnectedness of these dire effects and learn from nature.
Godwin Vasanth Bosco is an ecologist working to restore shola and grassland ecology in the Nilgiri Biosphere. He is the author of the book Voice of a Sentient Highland on the Nilgiri Biosphere
This was first published in Down To Earths print edition (dated 1-15 August, 2020)
We are a voice to you; you have been a support to us. Together we build journalism that is independent, credible and fearless. You can further help us by making a donation. This will mean a lot for our ability to bring you news, perspectives and analysis from the ground so that we can make change together.
Continue reading here:
Peril in the hills: Extreme weather a danger for Nilgiri ecosystem - Down To Earth Magazine
- Green with Envy | How to Spot an Eco-Snob | Part III - November 8th, 2009 [November 8th, 2009]
- EcoLogo - November 8th, 2009 [November 8th, 2009]
- 5 Ways to Green Your Exercise Routine - November 8th, 2009 [November 8th, 2009]
- Seed Bombs - November 8th, 2009 [November 8th, 2009]
- Guerrilla gardening - November 8th, 2009 [November 8th, 2009]
- Green Your Morning Routine - November 8th, 2009 [November 8th, 2009]
- Environmental Benefits of Telecommuting - November 8th, 2009 [November 8th, 2009]
- Safeway Sponsors Portland Community Cleanup - November 8th, 2009 [November 8th, 2009]
- Electric Vehicle Race - November 8th, 2009 [November 8th, 2009]
- Portland Bridge Pedal 2009 - November 8th, 2009 [November 8th, 2009]
- E-waste in Oregon - November 8th, 2009 [November 8th, 2009]
- Bike Sharing in Portland - November 8th, 2009 [November 8th, 2009]
- Bucks for the Bay Challenge - November 8th, 2009 [November 8th, 2009]
- Drive to Make a Difference with MyMPG - November 8th, 2009 [November 8th, 2009]
- Bathroom Sprayers - Green your Toilet Routine - November 8th, 2009 [November 8th, 2009]
- Ubuntu OS can Save Energy - November 8th, 2009 [November 8th, 2009]
- Green Metropolis, David Owen - November 8th, 2009 [November 8th, 2009]
- Sustainable Pens: GLO Pens - November 8th, 2009 [November 8th, 2009]
- International Day of Climate Action - November 8th, 2009 [November 8th, 2009]
- Donate to Oregon Toxics Alliance - November 8th, 2009 [November 8th, 2009]
- Biomass Energy Generation Myths - November 8th, 2009 [November 8th, 2009]
- Crude The Real Price of Oil | Playing in Portland - November 8th, 2009 [November 8th, 2009]
- Pictures From 350 Climate Day in Portland - November 8th, 2009 [November 8th, 2009]
- Arcimoto Electric Vehicles in Oregon - November 8th, 2009 [November 8th, 2009]
- Urban Rooftop Wind Turbines - November 8th, 2009 [November 8th, 2009]
- Chromium 6 Emissions from ESCO in Portland - December 13th, 2009 [December 13th, 2009]
- Food Inc. Review - December 19th, 2009 [December 19th, 2009]
- Making Maps with Google Earth and Google Maps by Shane Bradt of the University of New Hampshire Cooperative Extension - March 23rd, 2010 [March 23rd, 2010]
- Demonstration of Miradi 3.1 by Nick Salafsky of Foundations of Success - March 23rd, 2010 [March 23rd, 2010]
- Advanced Mashups – KML and the Mapping API by Cary Chadwick of the University of Connecticut Center for Land Use Education and Research - March 23rd, 2010 [March 23rd, 2010]
- Demonstration of InVEST by Heather Tallis of the Natural Capital Project - March 23rd, 2010 [March 23rd, 2010]
- GIS Maps Online by Emily Wilson of the University of Connecticut Center for Land Use Education and Research - March 23rd, 2010 [March 23rd, 2010]
- From ArcGIS to Web Maps: Simple Techniques for Publishing GIS Maps Online by Emily Wilson of the University of Connecticut Center for Land Use Education and Research - March 25th, 2010 [March 25th, 2010]
- Demonstration of Marine InVEST by Anne Guerry of the Natural Capital Project - March 31st, 2010 [March 31st, 2010]
- Eliminate and Decrease Styrofoam - March 31st, 2010 [March 31st, 2010]
- Portland Plans to Spend $600 million on Master Bike Plan - April 2nd, 2010 [April 2nd, 2010]
- (Webinar in Spanish) Demostración sobre Vista 2.5 de NatureServe en línea (Webinar) por Ian Varley, Carmen Josse, y Alexandra Sanchez de Lozada de NatureServe. - April 6th, 2010 [April 6th, 2010]
- Using and Adding Your Content to Google Ocean by Charlotte Vick, Google Content Manager of Mission Blue - April 13th, 2010 [April 13th, 2010]
- End Paper Receipts - May 1st, 2010 [May 1st, 2010]
- Demonstration of CanVis by Chris Haynes of NOAA Coastal Services Center - May 6th, 2010 [May 6th, 2010]
- Demonstration of HD.gov Web Portal by Jeff Adkins from NOAA Coastal Services Center - May 13th, 2010 [May 13th, 2010]
- Demonstration of Ecosystem Assessment and Reporting Tool by Steve Schill of The Nature Conservancy - May 13th, 2010 [May 13th, 2010]
- Demonstration of Version 2.0 of the Multipurpose Marine Cadastre by Adam Bode and Brian Smith of NOAA Coastal Services Center - May 17th, 2010 [May 17th, 2010]
- CRUDE Filmmakers Subpoenaed by Chevron - May 22nd, 2010 [May 22nd, 2010]
- Demonstration of the Digital Coast Coastal Inundation Toolkit by Steph Beard, Jodie Sprayberry and Billy Brooks of NOAA Coastal Services Center - May 25th, 2010 [May 25th, 2010]
- Presentation on the Creating Resilient Communities EBM Tool Demonstration Project by Jocelyn Hittle of PlaceMatters - June 10th, 2010 [June 10th, 2010]
- Presentation on Economic Data Needed for EBM by Linwood Pendleton of Duke University - October 11th, 2010 [October 11th, 2010]
- Recycling Water - October 16th, 2010 [October 16th, 2010]
- ODOT Partners with Oregon Toxics Alliance to Reduce Pesticides - October 17th, 2010 [October 17th, 2010]
- Goats Hired to Mow Portland Lot - October 17th, 2010 [October 17th, 2010]
- A World of Health: Connecting People, Place, and Planet - October 17th, 2010 [October 17th, 2010]
- Alternative Recycling Options - October 17th, 2010 [October 17th, 2010]
- No More Bullying the Bull Trout - October 17th, 2010 [October 17th, 2010]
- 1000+ EV Charging Stations Slated for Oregon I-5 Corridor - October 17th, 2010 [October 17th, 2010]
- The Vertical Farm Concept - October 17th, 2010 [October 17th, 2010]
- Blog Action Day 2010 | Water - October 17th, 2010 [October 17th, 2010]
- Eco Districts - October 24th, 2010 [October 24th, 2010]
- Will The Nissan Leaf Thrive? - October 24th, 2010 [October 24th, 2010]
- A Green Railroad - October 24th, 2010 [October 24th, 2010]
- Biomass is not Oregon's clean-energy future as currently promoted - October 24th, 2010 [October 24th, 2010]
- Electrified Parking Spaces - October 24th, 2010 [October 24th, 2010]
- Tree Planting - October 24th, 2010 [October 24th, 2010]
- Three Tips to Reduce Your Carbon Footprint and Live Longer. - October 24th, 2010 [October 24th, 2010]
- Biomass is not Oregon’s clean-energy future as currently promoted - October 31st, 2010 [October 31st, 2010]
- Rail~Volution - October 31st, 2010 [October 31st, 2010]
- Green Streets Initiative - October 31st, 2010 [October 31st, 2010]
- Mayor Kitty Piercy and Envision Eugene - November 7th, 2010 [November 7th, 2010]
- The Willamette River Transit Bridge - November 13th, 2010 [November 13th, 2010]
- Collaborative Learning and Land Use Tools to Support Community Based Ecosystem Management by Chris Feurt of the Wells National Estuarine Research Reserve - November 14th, 2010 [November 14th, 2010]
- Portland Federal Building Begins Green Makeover - November 14th, 2010 [November 14th, 2010]
- Vestas’ New HQ in Portland Shoots for LEED Platinum - November 14th, 2010 [November 14th, 2010]
- College Degrees to Get You in the Environmental Field - November 14th, 2010 [November 14th, 2010]
- Demonstration of openNSPECT, an Open Source Version of the Nonpoint-Source Pollution and Erosion Comparison Tool by Dave Eslinger of NOAA Coastal Services Center - February 14th, 2011 [February 14th, 2011]
- Demonstration of EMDS by Keith Reynolds of the US Forest Service - February 14th, 2011 [February 14th, 2011]
- Demonstration of Habitat Priority Planner by Chrissa Waite and Danielle Bamford of NOAA Coastal Services Center - February 14th, 2011 [February 14th, 2011]
- Presentation on the Coastal Adaptation to Sea Level Rise Tool (COAST) by Sam Merrill of the New England Environmental Finance Center - February 14th, 2011 [February 14th, 2011]
- Presentation on the Coastal and Marine Ecological Classification Standard by Kathy Goodin of NatureServe - February 14th, 2011 [February 14th, 2011]
- Demonstration of Coral Reef Scenario Evaluation Tool (CORSET) by Jessica Melbourne-Thomas of the University of Tasmania - February 14th, 2011 [February 14th, 2011]
- Demonstration of Multi-scale Integrated Models of Ecosystem Services (MIMES) by Roel Boumans and David McNally of AFORDable Futures LLC - February 14th, 2011 [February 14th, 2011]
- Creating Life in the Desert - February 14th, 2011 [February 14th, 2011]