摘要
水分条件是决定植物生长、分布的主要因子之一 ,也是生态学和地理学研究所关注的一个基本问题。本文依据最新的数据资料对东北农牧交错区水分条件的基本特征进行了分析 ,以三维图形表达了湿度指数的空间分布格局 ;对典型站点的年干燥度以及在年内的变化进行了分析 ;通过Kira指数、湿度指数和NDVI植被指数说明了农牧交错区植物生长。
Moisture regime, which served as a major factor, determines the plant distribution in transitional areas of farming and pasturing of the northeastern China. It is essential to analyze the relationship between the moisture regime and the plant distribution, in order to adjust measures to local conditions and prevent the desertification. The characteristics of moisture regime in the research areas had been analyzed by using the latest data. The spatial pattern of HI was expressed in three dimensions as well. The result of this research shows that the annual aridity increases from the east to west of the research area, although it is affected by contour microclimates. The aridity in summer and fall is less than that in winter and spring. Using the Kira index, HI, and NDVI vegetation index, the relation was shown more clearly. The seasonal change of NDVI values of different vegetation indicates that the correlation between monthly average of NDVI and precipitation is higher than that between monthly average NDVI and temperature. It is, therefore, obvious that the moisture regime is the principle factor for the land cover change in the research areas.
出处
《地理科学》
CSCD
北大核心
2001年第4期297-300,共4页
Scientia Geographica Sinica
基金
国家自然科学基金重点资助项目 (4973 10 2 0 )
