石羊河流域草地资源现状调查

The Current Situation of Grassland Resource in the Shiyanghe River Basin

石羊河流域是我国生态保护核心地区之一,草地是该流域占比最大的土地利用类型。为及时掌握石羊河流域草地资源现状,以国土三调和甘肃省第二次草地资源调查资料为基础,通过空间叠置分析以及野外补充调查,对石羊河流域草地面积、生产力、等级以及退化情况进行调查与评价。结果表明,石羊河流域草原共5个类30个型,总面积1215523.87 hm^(2);石羊河流域草地年鲜草总产量18.28×10^(8)kg,温性草原类总产量居首位,占全流域草原总产量的33.46%;石羊河流域草原资源总体质量中等偏下,以Ⅴ等、Ⅲ等、Ⅳ等以及6、7、8级草原为主;退化草地面积971458.29 hm^(2),占全流域草地总面积的79.92%,其中轻度退化占14.01%,中度退化占33.63%,重度退化占32.28%。

The Shiyanghe River basin is one of the core areas of ecological protection in China.The grassland was the largest land use type in the basin.In order to get the current situation of grassland resources in the Shiyanghe River basin,grassland area,productivity,grade and degradation was investigated and evaluated,based on the third national land survey and the second survey of grassland resources in Gansu province,using spatial overlay analysis and supplementary field investigation method.The result showed that the grassland resources in the Shiyanghe River basin were divided into 5 categories and 30 types,with a total area of 1215523.87 hm^(2).The annual yield of grass was 18.28×10^(8)kg,and the yield of temperate steppe was the highest,accounting for 33.46%of the total yield of grass in the whole basin.The overall quality of grassland resources in the Shiyanghe River basin was lower than medium,and it was mainly composed ofⅤ,Ⅲ,Ⅳand 6,7,8 grades.The degraded grassland area was 971458.29 hm^(2),accounting for 79.92%of the total grassland area in the whole basin,of which the slightly degraded grassland accounted for 14.01%,moderate degradation accounted for 33.63%,severe degradation accounted for 32.28%.