摘要
基于MODIS—NDVI遥感数据,利用像元二分模型估算河东地区2000—2010年的植被覆盖度,并在像元尺度上分析河东地区植被覆盖度的时空变化规律及其驱动因子。结果表明:河东地区平均植被覆盖度为50.93%,其中,甘南高原覆盖度最高,河东北部最低,植被覆盖度由南向北递减;研究时段内年平均植被覆盖度大于60%(优等)的区域占23.06%,且90.49%的区域植被覆盖度呈增加趋势,以河东中部植被覆盖度增加速度最快,为33.68%。从空间尺度上来看,降水是其主要的影响因素;而从时间尺度上,最主要的影响因素可能是植树造林。
Based on the MODIS/Terra NDVI remote sensing data, the vegetation coverage from 2000 2010 in Hedong region was estimated and the spatial and temporal change characteristic of vegetation coverage and the driving factors was analyzed by using the dimidiate pixel model. The results showed that the average veg etation coverage was 50.93% in Hedong region where the vegetation coverage was maximum in Gannan Plat eau, and the minimum value distributed in the northwestern part. The vegetation coverage decreases from south to north. The average vegetation coverage more than 60 %occupied 23.06 %of the region. The region- al vegetation coverage in the 90.49% of the region had an increasing trend, especially in the middle of He dong region where the vegetation coverage increased fastest （33.68%）. It can be seen rainfall was the main factor on the spatial scales, and afforestation was the key influence factor on the time scale.
出处
《水土保持研究》
CSCD
北大核心
2013年第1期112-115,307,共4页
Research of Soil and Water Conservation
基金
国家自然科学基金资助项目(40961038)
生态经济学省级重点学科(5001-021)
西北师范大学知识与科技创新工程项目(NWNU-KJCXGC-03-06)
关键词
植被覆盖度
像元二分模型
植被变化
河东地区
vegetation coverage
dimidiate pixel method
vegetation change
Hedong area
