Analysisof gddin north-west indiain context to climate change using gis

Mohan Singh, Ram Niwas and Godara A.K

A study was conducted to quantify trend in growing degree days (GDD), its variability and spatial distribution and its influence on fruit production in north-west Indiafor this purpose more than 30 years data on maximum and minimum temperatures of twenty two different agrometeorological stations of Jammu & Kashmir, Himachal Pradesh, Utrakhand, Punjab, Haryana, Chandigarh, Delhi, Uttar Pradesh and Rajasthan were used. The temperatures data was analyzed for computation ofGDD and the coordinates were converted (into decimal system) for each meteorological station, for spatial analysis. GDD trends for different meteorological stations in hills, plains of north-west India were evaluated using trend analysis. The map of north-west India was digitized and different GDD zones were delineated using GIS. The slope value (oC days/years) was positive for all the stations except Ranichauri (-0.93), Delhi (-0.29), and Narnaul (-0.8). The normal growing degree days available was 2199.4, 5136.8 and 4335.7 GDD with coefficient of variation of 13.3, 3.8 and 6.4% and showed an increasing rate of 8.56, 2.68 and 4.28 per year for hills, plains and north-west India, respectively. The normal GDD during effective growing season were 2178.2, 4752.8 and 4050.7 with increasing rate of 37, 32.2 and 33.5 GDD per decade for hills, plains and north-west India, respectively. During dormant season the normal GDD was 21.2, 384 and 285 for hills, plains and north-west India and were decreasing in plains at the rate of 54 GDD per 100 years but increasing in hills and north-west India at a rate of 93 GDD per 100 years.Based on spatial variation in GDD availability the north-west India was divided into five zones <2000 GDD, 2000-3000 GDD, 3000-4500 GDD, 4500-5200 GDD and >5200 GDD showing increasing trend from north-east to south-west direction of the study area.

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