1982～2000年黄淮海地区植被覆盖变化特征分析

Analysis on the Vegetation Cover Change in the HHH Zone of China in 1982～2000

利用1982～2000年8km NOAA—AVHRR数据，采用均值法、差值法和一元线性回归模拟法，分析了中国黄淮海地区植被的动态变化及其空间分布特征，模拟了年NDVI均值的变化趋势，并对不同植被类型的NDVI年内和年际变化规律进行了分析。结果表明：黄淮海地区植被覆盖总体上呈增加趋势，20世纪90年代末相对80年代初平均NDVI值增加了近0．03。从空间分布上看，大部分地区NDVI都呈增加的趋势，其中NDVI极显著增加的区域主要分布在山东的西北部和西部、河南的东部、河北的北部及江苏的北部地区，F检验的显著性水平达到了99％。NDVI呈减少趋势的地区很少，主要分布在北京、天津、山西中部。各植被类型的NDVI在年内的变化呈很强的季节性，年际变化规律大致相同，呈波动上升的趋势。

The spatial distribution and dynamic change of vegetation cover in the Huanghe-Huaihe-Haihe （HHH） zone are analyzed based on 8 km NOAA AVHRR-NAVI data from 1982 to 2000. The average value method, difference value method were used to analyze the monthly and annual changes. The linear regression of one variable was used to simulate the change trend of the NDVI values. As a result, the vegetation cover of the research area trends to increase as a whole, and the average NDVI value of the end of 1990s increased nearly 0. 03 in contrast with that of the beginning of 1980s. The simulating results indicate that the NDVI vale of most regions increased, and the significantly increased regions mainly appear in west and northwest parts of Shandong,east part of Henan,north part of Hebei and north part of Jiangsu, in which regions the significant level of F test reach to 99%. However, there are only some regions of Beijing, Tianjin, and middle of Shanxi where vegetation cover decreased. The monthly changes of NDVI of different vegetation types display intense seasonality,while the annual NDVI trend to increase fluctuantly.