退耕还林(草)背景下渭河流域植被覆盖时空变化分析

ISWC OpenIR > 水保所知识产出(1956---)

	退耕还林(草)背景下渭河流域植被覆盖时空变化分析
其他题名	Analysis of Spatial and Temporal Variation of Vegetation Cover in
	蒋冲; 王飞; 穆兴民; 李锐
	2012
发表期刊	农业现代化研究
卷号	33 期号:04 页码:470-474
摘要	以SPOT VGTETATION的归一化植被指数为基础,借助GIS软件的空间分析功能和线性回归分析法对渭河流域植被覆盖空间分布特征以及退耕还林(草)工程实施以来植被覆盖时空变化趋势进行了分析。结果表明:渭河流域六盘山、子午岭、秦岭北麓和关中盆地一带各有一条NDVI高值区。渭河源区植被覆盖较好,黄土塬区次之,丘陵沟壑区最差。退耕以来NDVI年最大化值增加显著,植被覆盖在空间上呈现出整体改善,局部退化趋势。轻微改善、中度改善、明显改善的区域所占面积分别为29.35%、26.49%和8.21%,另有6.59%的土地轻微退化。其中,黄土高原丘陵沟壑区植被覆盖增加趋势显著,变化斜率出现负值的区域主要位于渭河中下游和泾河中上游地区。研究区不同坡度等级的坡地植被覆盖状况得到明显改善,变化速率由大到小依次排序为0°-6°、6°-15°、15°-25°和>25°的坡地。位于丘陵沟壑区的吴旗等县坡地植被恢复趋势最为明显,泾河中游、北洛河中上游以及渭河上游等地区也有明显好转趋势。
其他摘要	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 ENVI 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°.WuqiCountywhich is located in hilly and gully region presented themost obvious recover trend, midstream of Jing River, upstream and midstream Beiluo River as well as upstream of Wei River also had significant recover trend. Key words：Wei River
关键词	渭河流域 Wei River Basin 植被覆盖 Vegetation Cover Ndvi Ndvi 退耕还林(草) Converting Farmland Into FOrest Or Grassland 时空变化 Temporal And
语种	中文
文献类型	期刊论文
条目标识符	sbir.nwafu.edu.cn/handle/361005/5334
专题	水保所知识产出(1956---)
推荐引用方式 GB/T 7714	蒋冲,王飞,穆兴民,等. 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(04):470-474.
APA	蒋冲,王飞,穆兴民,&李锐.(2012).退耕还林(草)背景下渭河流域植被覆盖时空变化分析.农业现代化研究,33(04),470-474.
MLA	蒋冲,et al."退耕还林(草)背景下渭河流域植被覆盖时空变化分析".农业现代化研究 33.04(2012):470-474.

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