甘南牧区草地生产力与载畜量时空动态平衡研究

利用2005~2007年每日MODIS地表反射率产品MOD09GA和草地地上生物量鲜重实测数据与实际载畜量资料,建立甘南州草地生物量与可食牧草量遥感监测模型、不同季节放牧草场的理论载畜量模型和草畜平衡监测模型,分析天然草地的生产力与载畜量的时空动态平衡状况与调控对策。结果表明,甘南州全年总可食牧草的鲜草产量为61.9亿kg,其中暖季草场、冷季草场和全年草场的可食牧草产量分别占总可食牧草产量的35%、24%和42%。全州的理论载畜量为689.5万羊单位,冷季牧场和全年草场的超载率分别为82%和84%,而暖季草场欠载率为37%,全州草地的超载率为26%。如果保持现有的家畜数量不减,则全年需要补给牧草约26亿kg,补饲量占全州天然草地提供牧草量的42%。如果将农牧区和纯牧区的超载量分别降低50%和80%,则需要补给牧草13亿kg和5.2亿kg,补饲量占全州天然草地提供牧草量的21%和8.4%。

Spatial-temporal Dynamic Balance between Livestock Carrying Capacity and Productivity of Rangeland in Gannan of Gansu Province,China

By use of rangeland and livestock data investigated during 2005-2007 and Terra/MODIS(Moderate-resolution Imaging Spectroradiometer) daily surface reflectance product of MOD09GHK from 2005 to 2007 in Gannan,rangeland productivity and livestock carrying capacity on the spatial-temporal scales were studied.The models of monitoring rangeland aboveground biomass,available forage,theoretic livestock carrying capacity and balance between forage and animal were established based on the average available yield of ra...