Responses of vegetation in ecotone of North Yinshan Mountain area to precipitation.

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Responses of vegetation in ecotone of North Yinshan Mountain area to precipitation.

XIA Hong¹; FAN Jin-long²; WU Jian-jun¹

¹Key Laboratory of Environmental Change and Natural Disaster of Education Ministry, College of Resources Science and Technology, Beijing Normal University, Beijing 1000875，China;²Key Laboratory of Radiometric Calibration and Validation for Environmental Satellites, China Meteorological Administration,Beijing 100081, China

Received:2006-09-12 Revised:1900-01-01 Online:2007-05-08 Published:2007-05-08

Abstract

Abstract: The eco-environment in northern China is vulnerable and changeful, and drought is one of the main affecting factors. By using NOAA/AVHRR NDVI and SPI (standard precipitation index) as the proxies of vegetation activity and water resource, the effects of precipitation on the vegetation change in agro-pasture ecotone of North Yinshan Mountain area was investigated. The correlation coefficient between monthly NDVI in growth season (May to October) and corresponding one month SPI (1-SPI) was calculated, and a 1983—2003 data series was created.It was found that the correlation coefficient between NDVI and 1-SPI during May-October differed with months, but was generally the highest in May. The velocity of NDVI change (VNDVI) could indicate the vegetation growth rate, and had influence on the responses of vegetation to precipitation.

Key words: Rice, Nitrogen application levels, Yield simulation, Optimization, Paddy field

XIA Hong¹; FAN Jin-long²; WU Jian-jun¹. Responses of vegetation in ecotone of North Yinshan Mountain area to precipitation.[J]. cje.

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Responses of vegetation in ecotone of North Yinshan Mountain area to precipitation.

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