Study on the Dynamically Monitoring and Simulating the Vegetation Cover in Northwest China in the Past 21 Years
Study on the Dynamically Monitoring and Simulating the Vegetation Cover in Northwest China in the Past 21 Years
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发表时间：
2003
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通讯作者：
M. Ming
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作者：
M. Ming
本文的研究区域是西北地区的中国。该数据是1981年至2001年的8公里AVHRR。采用平均值法、差值法分析年变化和年际变化。采用一元线性回归方法模拟最大NDVI值的变化趋势，并计算变化量。结果表明，植被盖度在每年的7~8月份达到最佳状态。近21年来，中国西北大部分地区植被退化较为严重。然而，有些地区的植被覆盖率正在增加。但总体上上升幅度小于下降幅度。模拟结果表明，植被覆盖改善区主要出现在新疆维吾尔自治区西部和北部。
The study area of this paper is Northwest China. The data is 8 km AVHRR from 1981 to 2001. The average value method, difference value method were used to analyze the annual and interannual changes. The linear regression of one variable was used to simulate the change trend of the maximal NDVI values and calculate the change quantity. As a result, the vegetation cover reaches the best condition between July and August in each year. During the last 21 years, the vegetation degradation is popular in most of Northwest China. However, there are some regions where vegetation cover is increasing. But the increasing range is smaller than the decreasing range on the whole. The simulating results indicate that the improved regions of vegetation cover mainly appear in west and north parts of Uygur Autonomous Region of Xinjiang.