【作者】 查勇； 倪绍祥； 沈宁泽；

【Author】 Zha Yong;Ni Shaoxiang;Shen Ningze;School of Geographic science,Nanjing Normal University;

【机构】 南京师范大学地理科学学院；

【摘要】 利用现代遥感技术,系统地探讨了草地资源退化的定量遥感评价方法。首先从反映草地资源退化的指标中选择了两个重要指标——草地植被盖度和可食牧草率,通过样方对不同实测光谱植被指数分别与盖度和可食牧草率之间进行相关分析发现,盖度和可食牧草率分别与归一化植被指数和土壤调节植被指数间相关性最大。然后以地面遥感为基础,建立了草地资源退化指标的卫星遥感反演模型。最后把草地资源退化综合等级划分为无退化、轻度退化、中度退化与强度退化四级,得到了研究区草地资源退化综合评价图。更多还原

【Abstract】 This paper systematically addressed the evaluation method of quantifying degradation grassland resources by the remote sensing technology.First,two important indicators of grassland resources degradation,grassland cover density and proportion of palatable grass species,were selected from a number of factors.Correlation analysis between vegetation indices derived from in situ measured spectral reflectance and grass cover density and the proportion of palatable grass species reveals that these two grassland parameters were the most closely related to normalized difference vegetation index(NDVI) and soil adjusted vegetation index(SAVI).Second,the ground measured spectral reflectance data were used to establish the regression model for grassland resources degradation from satellite imagery data.Finally,the grassland resources degradation was mapped at four severity levels of intact,slight degradation,moderate degradation and severe degradation to show the evaluated results of overall degradation in the study area.更多还原