呼伦贝尔草甸草原牧草产量及载畜力估算  

Estimation of meadow steppe yield and carrying capacity of meadow grassland in Hulunber region

作　　者：闫瑞瑞[1] 杨桂霞[1] 张宏斌[1] 张保辉[1] 辛晓平[1] 

机构地区：[1]农业部资源遥感与数字农业重点开放实验室呼伦贝尔草原生态系统国家野外科学观测研究站中国农业科学院农业资源与农业区划研究所,北京100081

出　　处：《草业科学》2010年第12期140-147,共8页Pratacultural Science

基　　金：呼伦贝尔草原牧草产量的遥感估算与载畜能力研究(RDA0911);现代农业产业技术体系建设专项资金;公益性行业科研专项(200903060)

摘　　要：采用改进后的CASA模型估算2009年呼伦贝尔谢尔塔拉草甸草原生长季的牧草产量和载畜量状况,利用2009年牧草生长季的地面实测样方数据对CASA模型进行验证。结果表明,呼伦贝尔谢尔塔拉草甸草原的NPP值(以C计算)全年呈单峰变化,7月份达到最大,为71.92 g/m2。NPP值的年内变化与草原植被的返青期-生长期-衰退期相对应。估算的牧草产量值与地面实测值无显著性差异,且季节变化与地面样方实测值的变化趋势基本相一致,牧草产量的模拟精度达到94.05%。群落生长各阶段的总盖度、牧草高度与牧草产量之间均存在显著正相关关系。根据2009年谢尔塔拉牧场草甸草原的产量估测结果,适宜载畜量应为7 562.40牛单位,但实际载畜量大于适宜载畜量,超载率达13.37%。The improved CASA model was used to estimate the net primary productivity(NPP) and the carrying capacity of Xieertala meadow steppe during growing season of 2009 in Hulunber region,and then output from the improved CASA model was validated by the field survey data during growing season of 2009.The results of this study indicated that the estimated NPP of Xieertala meadow steppe in Hulunber region showed a unimodal curve throughout the year,peaking in July with 71.92 g/m2 yield.NPP changes corresponded to ci...

关 键 词：呼伦贝尔 谢尔塔拉草甸草原 CASA模型 牧草产量 载畜力 

分 类 号：S812.8[农业科学—草业科学]