渭河流域关中段近30年植被动态变化分析  

DYNAMIC CHANGES OF VEGETATION IN GUANZHONG PART OF WEIHE RIVER BASIN IN RECENT 30 YEARS

作　　者：乔晨[1] 占车生[2] 徐宗学[3] 李玲[3] 

机构地区：[1]北京师范大学地理学与遥感科学学院,北京100875 [2]中国科学院地理科学与资源研究所,陆地水循环与地表过程重点实验室,北京100101 [3]北京师范大学水科学研究院,北京100875

出　　处：《北京师范大学学报（自然科学版）》2011年第4期432-436,共5页Journal of Beijing Normal University(Natural Science)

基　　金：国家水体污染控制与治理科技重大专项资助项目(2009ZX07212-002);科技部国际合作资助项目(2009DFA22980)

摘　　要：选取渭河流域关中段1980、1990、2000、2005、2007年5期MSS/TM/ETM影像数据,计算提取流域不同时期的归一化植被指数(NDVI),并根据像元二分模型估算关中段流域1980—2007年的植被覆盖度分布,将计算得到的植被覆盖度进行分级处理,获得渭河流域关中段植被覆盖度分级图,系统研究了渭河关中段近30 a来的NDVI和植被覆盖的时空变化特征,详细地分析了不同时期、不同区域植被在其生长周期内的长势情况,以及植被生长状况在空间上的差异性,系统研究了渭河流域关中段近30 a的植被动态变化.结果表明:该区域NDVI和植被覆盖度近30 a总体上呈增长趋势,仅1990—2000年期间有所下降.Dynamic changes in vegetation has important implications for regional ecological systems and environmental change regulations. This study selected five periods of MSS/TM/ETM image data filmed in 1980, 1990, 2000, 2005 and 2007 over the Guanzhong part of Weihe River basin, calculated and extracted NDVI in different periods. Vegetation coverage distributions in 1980 to 2007 were estimated and graded according to the dimidiate pixel model. The spatial distribution of vegetation fraction over Guanzhong region was generated. Growth status of different vegetation types and their spatial difference could be understood in detail by analyzing spatio--temporal change characteristics of NDVI and vegetation coverage in the last 30 years. Data indicated that NDVI and vegetation coverage in the area tended to increase with some fluctuations in the past 30 years, with decline seen in the early 1990s to 2000.

关 键 词：植被动态变化 渭河流域关中段 NDVI 植被覆盖度 

分 类 号：S157.1[农业科学—土壤学]