摘要
利用8 km分辨率的AVHRR/NDVI数据分析了延河流域1982~2006年NDVI时空变化特征及其对降水变化的响应。结果表明,近25年来,延河流域年均NDVI增长趋势并不显著,但存在明显的空间差异。延河流域西北部地区植被NDVI显著增加;西南部地区NDVI显著下降。从植被类型看,荒草地的年均NDVI显著提高,林地的年均NDVI显著下降。延河地区NDVI变化与降水有密切的相关性,并且不同类型植被对降水变化的敏感程度存在差异,其中耕地和荒草地对降水变化最为敏感,其次草地,而林地受降水变化影响最小。
The spatio-temporal changes of NDVI and precipitation in Yanhe River Basin were analyzed based on 8 km resolution multi-tempo- ral NOAA AVHRR-NDVI data and precipitation data from 1982 to 2006. Meanwhile, the response of growing season NDVI to precipitation was also studied. The results showed that in recent 25 years, the mean land cover （ND^I） and precipitation had no significant change in the Yan- he River Basin. However, the NDVI and precipitation distribution of spatial were changed significantly. The NDVI value in the northwest area of the Yanhe River Basin, which mainly covered with grassland, was raised with decreased of NDVI value in the southwest area of the Yanhe River Basin, which mainly covered with forest land. At the same time, the effects of precipitation on NDVI were difference for different vegeta- tion types. The precipitation changes affected grassland NDVI significantly, and followed with the farm land and grass-shrub land. Compared with grassland or farmland, the precipitation effect on forest land was not significant.
出处
《安徽农业科学》
CAS
2013年第22期9381-9384,共4页
Journal of Anhui Agricultural Sciences
基金
陕西省自然科学基金项目(2011JQ5005)
霍英东教育基金会高等院校青年教师基金项目(131025)
陕西师范大学中央高校项目(GK261001004)
关键词
NDVI
植被
降水
延河流域
NDVI
Vegetation
Precipitation
Yanhe River Basin
