Press Esc to close
Friday 26 May 2017
News updated at 2:09 AM IST

Reduction in forest area has led to deficit rainfall, says IISc study

Bosky Khanna, Bengaluru, Aug 19, 2016, DHNS: 1:31 IST
The study, conducted by Prof T V Ramachandra, Centre for Ecological Sciences, IISc along with Uttam Kumar and Anandita Dasgupta, showed that the dense forest areas in the northern, central and southern Western Ghats have decreased by 2.84%, 4.38% and 5.77% respectively and agricultural or grasslands have increased by 2.23%, 4.32% and 5.85%.
The state has received deficit rainfall this season. This is not just because of global warming and el Nino effect, but also because of change in land use, especially reduction of forest cover.

A recent study by researchers from the Indian Institute of Science (IISc) titled “Time-Series Modis Normalised Difference Vegetation Index (NDVI) based vegetation change analysis with land surface temperature and rainfall in Western Ghats, India” shows that because of change in landscape of north, central and southern Western Ghats, there is a decline in rainfall trend, which is also having an adverse impact on the food and water security.

The study, conducted by Prof T V Ramachandra, Centre for Ecological Sciences, IISc along with Uttam Kumar and Anandita Dasgupta, showed that the dense forest areas in the northern, central and southern Western Ghats have decreased by 2.84%, 4.38% and 5.77% respectively and agricultural or grasslands have increased by 2.23%, 4.32% and 5.85%.

The rainfall time-series data also showed a decreasing trend in the rainfall pattern from 2013 towards 2020 in the northern, central and southern Western Ghats, revealing a grave situation threatening water and food security in peninsular India with an increasing trend of deforestation. Also, the number of rainy days had decreased in the southern Western Ghats region.

The trends in rainfall time-series data were analysed using statistical methods and modelled using auto-regressive integrated moving average (ARIMA) which indicated a decreasing trend in the rainfall pattern, Ramachandra said.

There is also a marginal increase in human settlement or soil area and small decrease in the spatial extent of water bodies in all the three regions. The study also revealed that the temperature in dense forests has always been less than in agricultural or grassland areas in all the three seasons.

"We focused on vegetation data to investigate the distribution of land surface temperature and rainfall because the existing vegetation distribution is largely controlled by temperature and precipitation pattern. Monthly climatic changes and trends of the last 10 years provided a clear illustration of the NDVI trends,’’ he said.

Differences in NDVI–temperature and NDVI–precipitation correlations relative to vegetation types such as forest and agriculture or grassland were also investigated. This result supports and is of similar magnitude as temporal studies showing increase of NDVI corresponding to increase in growing season temperature over the length of the satellite record, Ramachandra added.

Go to Top

Photo Gallery
German Chancellor Angela Merkel (R-L), former US President Barack Obama and Heinrich...

German Chancellor Angela Merkel (R-L), former US President Barack Obama and Heinrich...

External Affairs Minister Sushma Swaraj greeting Indian woman Uzma at Jawahar Bhawan after she...

External Affairs Minister Sushma Swaraj greeting Indian woman Uzma at Jawahar Bhawan after she...

Police officials stand by the wreckage of the Sikorsky VT-CMM helicopter, carrying Maharashtra...

Police officials stand by the wreckage of the Sikorsky VT-CMM helicopter, carrying Maharashtra...

Supporters of Indias Bharatiya Janata Party (BJP) try to break a police barricade during...

Supporters of Indias Bharatiya Janata Party (BJP) try to break a police barricade during...

A supporter of Bharatiya Janata Party (BJP) smashes an overturned car during a protest against...

A supporter of Bharatiya Janata Party (BJP) smashes an overturned car during a protest against...

Members of Sadou Asom Nirman Sramik Union under the banner of CITU staging a protest...

Members of Sadou Asom Nirman Sramik Union under the banner of CITU staging a protest...

Pakistan occupied Kashmir (PoK) refugees shouting slogans during a protest for their various...

Pakistan occupied Kashmir (PoK) refugees shouting slogans during a protest for their various...

Activists of All Bodo Students Union (ABSU) taking out a protest rally against an alleged fake...

Activists of All Bodo Students Union (ABSU) taking out a protest rally against an alleged fake...

NCC cadets of Jammu and Kashmir unit raising patriotic slogans after performing drills during...

NCC cadets of Jammu and Kashmir unit raising patriotic slogans after performing drills during...

Relatives and villagers attending the funeral of eight activists who had lost their lives...

Relatives and villagers attending the funeral of eight activists who had lost their lives...

Like us on Facebook

Copyright 2017, The Printers (Mysore) Private Ltd., 75, M.G Road, Post Box 5331, Bengaluru - 560001
Tel: +91 (80) 25880000 Fax No. +91 (80) 25880523
Powered by Yodasoft Technologies Pvt. Ltd.