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鄱阳湖区域植被覆盖变化与降水相互响应关系

顾婷婷;周锁铨;邵步粉;李强   

  1. 南京信息工程大学江苏省气象灾害重点实验室, 南京 210044
  • 收稿日期:2008-09-01 修回日期:1900-01-01 出版日期:2009-06-10 发布日期:2009-06-10

Interactions between vegetation cover change and precipitation in Poyang Lake region.

GU Ting-ting;ZHOU Suo-quan;SHAO Bu-fen;LI Qiang   

  1. Jiangsu Key Laboratory of Meteorological Disaster, Nanjing University of Information Science & Technology, Nanjing 210044, China
  • Received:2008-09-01 Revised:1900-01-01 Online:2009-06-10 Published:2009-06-10

摘要: 利用1982—1999年归一化植被指数(NDVI)数据集和鄱阳湖区域87个气象站点降水数据,采用年代差异变化、经验正交函数分析及相关分析方法,对鄱阳湖区域植被和降水的相互响应关系进行分析,从年内和年际不同尺度分别阐明植被和降水的相互影响时间和程度。结果表明:降水和植被的变化具有很好的空间一致性;多年平均表明,植被滞后于降水的变化;NDVI的年际变化对后期降水存在一定影响;相关分析显示,植被的生长变化滞后于降水变化6、7、8旬的相关性最高,相关系数分别为0.564、0.571和0.549,并且季节的相关分析发现,滞后一个季节的相关性最显著,且春秋季的降水对植被生长尤为重要。

关键词: 刺槐, 水分生理生态, 立地, 黄土高原

Abstract: Based on the 8 km resolution multi-temporal NOAA AVHRR-NDVI datasets and the daily precipitation data from 87 meteorological observation stations in 1982〖KG-*2〗-〖KG-*7〗1999, the interactions between NDVI and precipitation in Poyang Lake region were analyzed at annual and inter-annual scales by applying inter-decadal variations, empirical orthogonal function (EOF), and correlation analysis. There was a good spatial coincidence between the variations of NDVI a nd precipitation. In multi-year average, the NDVI variation lagged behind preci pitation change, and the inter-annual variation of NDVI had definite effects on the later precipitation. The correlation coefficients of NDVI and precipitation reached the peak with the time lags of 60, 70, and 80 days, being 0564, 057 1, and 0549, respectively. At seasonal scale, the correlation between NDVI and precipitation was significant, and the precipitation in spring and autumn was p articularly important for vegetation growth.

Key words: Robinia pseudoacacia, Water physiological ecology, Habitat, Loess Plateau