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| 过去21 a中国西北植被覆盖动态监测与模拟 | |
| 引用本文： | 马明国,董立新,王雪梅.过去21 a中国西北植被覆盖动态监测与模拟[J].冰川冻土,2003,25(2):232-236. |
| 作者姓名： | 马明国 董立新 王雪梅 |
| 作者单位： | 1. 中国科学院,寒区旱区环境与工程研究所冻土工程国家重点实验室,甘肃,兰州,730000 2. 青海省气象科学研究所,青海西宁,810001 3. 中国科学院,寒区旱区环境与工程研究所,甘肃,兰州,730000 |
| 基金项目： | 中国科学院知识创新工程项目;KZCX1-10-06和KZCX2-301; |
| 摘 要： | 利用1981至2001年8kmAVHRR数据．采用均值法、差值法和一元线性回归模拟法．分析西北植被年内变化、年际变化特征，并模拟近21aNDVI最大化值的变化趋势线和NDVI增长幅度．统计结果表明，中国西北植被覆盖在7—8月达到年内最丰盛；近21a来植被覆盖存在普遍退化的趋势，且后10a变化幅度大于前10a变化幅度，在局部区域有权被改善的趋势，改善幅度小于退化幅度．摸极结果表明，植被改善的区城主要分布在新疆西部和北部地区． |
| 关 键 词： | 均值法 差值法 植被 年际变化 新疆 西北地区 季节变化 |
| 文章编号： | 1000-0240(2003)02-0232-05 |
| 修稿时间： | 2002年10月15日 |
Study on the Dynamically Monitoring and Simulating the Vegetation Cover in Northwest China in the Past 21 Years |
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| MA Ming guo ,DONG Li xin ,WANG Xue mei.Study on the Dynamically Monitoring and Simulating the Vegetation Cover in Northwest China in the Past 21 Years[J].Journal of Glaciology and Geocryology,2003,25(2):232-236. | |
| Authors: | MA Ming guo DONG Li xin WANG Xue mei |
| Institution: | MA Ming guo 1,DONG Li xin 2,WANG Xue mei 3 |
| Abstract: | 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. |
| Keywords: | Northwest China vegetation cover AVHRR remote sensin g |
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