1995—2014年北洛河流域植被恢复的地形分布特征  

Topographical Distribution Characteristics of Vegetation Restoration in the Beiluo River Basin from 1995 to 2014

作　　者：闫瑞[1] 张晓萍[1,2] 闫胜军[3] 赵文慧[1] 

机构地区：[1]西北农林科技大学土壤侵蚀与旱地农业国家重点实验室,陕西杨凌712100 [2]中国科学院水利部,陕西杨凌712100 [3]北京师范大学水环境模拟国家重点实验室,北京100875

出　　处：《东北大学学报（自然科学版）》2016年第11期1598-1603,共6页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(41440012;41230852;41101265);中科院重点部署项目(KZZD-EW-04-03-03);中科院知识创新项目(KZCX2-XB3-13)

摘　　要：以1995,2007和2014年Landsat TM影像为数据源,计算归一化植被指数(NDVI),分析退耕还林政策下北洛河流域植被的恢复程度.结果表明,流域三年平均植被覆盖度分别为:46.4%,63.4%和73.4%.上游吴起、志丹等县所在丘陵沟壑区增加态势最明显,三年平均植被覆盖度分别为20.2%,41.64%,51.2%.系统分析流域上游丘陵沟壑区植被恢复在地形上的趋势变化.结果表明:不同高程、坡度和坡向分布带上均表现出植被覆盖度随着时间进展呈现明显好转态势.Taking the Beiluo river basin as an example, the Landsat TM image data in 1995, 2007 and 2014 were employed and the vegetation coverage was derived to analyze how the vegetation restored. The results showed that the average vegetation coverage in the three years of the whole basin are 46.43%, 63.42%, and 73.4%, respectively. The trends of vegetation distribution on landform were analyzed in the upper reaches of the basin. It is showed that whatever the elevation belts, slope gradient spans, and slope aspect zones were, the vegetation coverage improved distinctively in 1995, 2007 and 2014. Meanwhile, the extent or the area of low vegetation coverage transforming to high vegetation coverage tends to be greater with the elevation lower, slope gradient larger, and slope aspect inclining to be shady. © 2016, Editorial Department of Journal of Northeastern University. All right reserved.

关 键 词：植被恢复 覆盖度 地形因子 北洛河 丘陵沟壑区 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]