农业现代化研究2012，Vol.33Issue(4)：470-474,5.
退耕还林(草)背景下渭河流域植被覆盖时空变化分析
Analysis of Spatial and Temporal Variation of Vegetation Cover in Wei River Basin under Background of Converting Farmland into Forest or Grassland
摘要
Abstract
Time-series SPOT VGT NDVI datasets, which served as an evaluation index of the vegetation cover, were used in this paper to analyze the distribution characteristics and change trend of year maximum NDVI in Wei River Basin since converting farmland into forest or grassland project implementation with the help of Arc GIS 10.0 and ENV1 4.7 software. The results indicated that: there were high value in Liupan Mountain, Ziwu Mountain, northern slope of Qin Mountain and Guanzhong area. The vegetation cover condition in source area of Wei River was best, loess tableland area was worse, hilly and gully region was worst. The overall vegetation coverage was improving while local vegetation coverage presented a bad trend. The slight improvement, moderate improvement and significant improvement area accounted for 29.35%, 26.49% and 8.21% respectively. Nevertheless, 6.59% area of the whole basin presented a degrading trend, so it is necessary to further strengthen the ecological environment construction in the future. Most regions in the Wei River Basin showed significant positive correlation between NDVI and time over the past decade, especially in the Loess Hilly-gully Region where the achievements of vegetation construction were quite noticeable. Counties or cities with negative slope mainly located in the middle and lower part of Wei River. Moreover, the vegetation cover in four different slope areas experienced great improvement from 1998 to 2010, which were arranged by the order of 0° -6°, 6° -15° , 15° -25° and above 25°. Wuqi County which is located in hilly and gully region presented the most obvious recover trend, midstream of Jing River, upstream and midstream Beiluo River as well as upstream of Wei River also had significant recover trend.关键词
渭河流域/植被覆盖/NDVI/退耕还林(草)/时空变化Key words
Wei River Basin/ vegetation cover/ NDVI/ converting farmland into forest or grassland/ temporal and spatial variation分类
农业科技引用本文复制引用
蒋冲,王飞,穆兴民,李锐..退耕还林(草)背景下渭河流域植被覆盖时空变化分析[J].农业现代化研究,2012,33(4):470-474,5.基金项目
国家自然科学基金资助项目"基于相同气候条件的人类活动对河流水沙影响定量评价-以黄土高原延河流域为例(编号:41171420) （编号:41171420）
中国科学院水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室基金项目"北方旱区表层土壤水分遥感监测试验研究"(编号:10502-Z12-9) （编号:10502-Z12-9）
中荷联合主题研究项目"渭河流域水环境问题综合治理对策研究"(中国科学院对外合作重点项目,GJHZ1018,Netherlands Organization for Scientific Research,0ND1339291) （中国科学院对外合作重点项目,GJHZ1018,Netherlands Organization for Scientific Research,0ND1339291）
