Monitoring grassland degradation dynamically at Maduo County in source region of Yellow River in past 15 years based on remote sensing

作者：Chang Liu · 发表于：Ganhanqu dili · 年份：2012 · 被引用次数：5 · 研究领域：Remote Sensing and Land Use、Environmental Changes in China、Environmental and Agricultural Sciences

The Yellow River source region,as the headwater of the Yellow River,where the ecological environment is sensitive and vulnerable,is located in hinterland of the Qinhai-Tibet Plateau.It is of significant importance to protecting and constructing natural protection of Three-River Headwater by using remote sensing to monitor dynamically the grassland degradation in different temporal and spatial scale in this region.Grassland degradation refers to the overall reduction in grassland productivity as a consequence of human activities and natural processes.It represents the decline of grassland quality,density of grass cover,productivity,service function,or an increase in unpalatable grass species,and even as denudation of underlying soil.Compared with conventional grassland degradation researches,which are through field investigation to identify contributing factors and then each of the factors was graded and combined,remote sensing is much more efficient in assessing grassland degradation.Accorded to the national standard of China(GB19377-2003) and actual condition of grassland degradation in the Maduo County in the source region of the Yellow River,this study selected vegetation cover,pasture plant height,aboveground biomass,palatable pasture proportion,soil organic matter as the 5 evaluation indices.Then the calculation models were established based on the remote sense and in situ measured data,to monitor and evaluate grassland degradation in that region.Because of differential ...