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阴山北麓农牧交错带植被变化对降水的响应

夏虹1;范锦龙2;武建军1   

  1. 1北京师范大学 环境演变与自然灾害教育部重点实验室, 北京师范大学资源学院, 北京 100875;2中国气象局 中国遥感卫星辐射测量和定标重点开放实验室 国家卫星气象中心, 北京 100081
  • 收稿日期:2006-09-12 修回日期:1900-01-01 出版日期:2007-05-08 发布日期:2007-05-08

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

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

  1. 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

摘要: 选取中国北方农牧交错带的阴山北麓地区,以NOAA-AVHRR遥感数据和气象站点观测的降水数据作为主要数据源,利用植被指数(NDVI)指示研究区植被覆盖状况,用标准化降水指数(standard precipitation index, SPI)表征区域水分状况,研究降水对区域植被覆盖变化的影响。对研究区1983—2003年间生长季(5—10月)的逐月NDVI序列和同期1个月尺度的SPI(即1-SPI)序列进行相关分析。结果表明:5—10月,NDVI与1-SPI的相关关系随月份的变化而各不相同,总体上5月份相关系数较高;植被覆盖变化率(velocity of NDVI change, VNDVI)反映植被生长速率,其大小影响植被对降水变化的响应程度。

关键词: 水稻, N素水平, 产量模拟, 优化

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