青海省达日县退化草地研究 Ⅰ退化草地遥感调查

The Investigation of Grassland Degradation in Dari Countyof Qinghai Province I: Remote Sensing and Mapping

应用遥感和地理信息系统以及地面调查等多种技术，通过对达日县１９８５～１９９７年地面观测资料和遥感影像的对比分析，确定了该区可利用草地系数、可食牧草系数和牧草利用系数，建立了草地资源遥感动态监测模型；模拟计算了全县及各乡的草地资源产草量、理论载畜量、季节牧场载畜量和草地生长动态；并且分析了全县草地资源退化的数量及其空间分布，绘制了草地产量、载畜量和草地分级等图件。上述研究结果，对达日县草地资源的持续监测及严重退化的高寒草甸的治理，可提供科学的依据。

ased on Remote Sensing and Geographic Information System technologies, the ratio of usable grassland, usable grass and edible grass were identified in Dari County of Qinghai Province by comparing field work with RS images from 1985 to 1997, and a RS dynamic monitoring model of grassland resource was constructed, measuring the total grass yield for each township in this county, theoretic animal capacity, seasonal stocking rate and the dynamics of grassland growth. In addition, the degree and spatial distribution of degraded grassland was investigated and the maps of grass yield, grassland gradation, and stocking rate were made. The investigation results by this approach can provide a reference foundation for systematically monitoring grassland resource dynamics and making a policy for management of sever grassland degradation.