三江源草地ANPP变化特征及其与气候因子和载畜量的关系

发布时间：2018-06-04 19:50

  本文选题：三江源 + 地上净初级生产力(ANPP)　； 参考：《中国草地学报》2017年03期

【摘要】：在野外调查数据检验的基础上,采用CASA模型计算了2000~2014年三江源草地的地上净初级生产力(ANPP),进而分析了ANPP与气候因子和载畜量之间的关系。结果表明:2000~2014年三江源地区草地ANPP平均值为27.53gC/m2,其中75.81%的区域呈增加趋势,24.19%的区域呈减少趋势;整个三江源地区草地ANPP变化与年均温具有显著(P0.01)的正相关关系,且在不同降水区域内ANPP随年均温的升高表现为先增加后减少;不同区域草地ANPP对年降水量的响应受温度的制约,在年均温-2℃的区域ANPP随年降水量的增加而增加,年均温在-2~-6℃之间的区域表现为先增加后下降,而在年均温-6℃的区域则无响应;三江源草地ANPP对载畜量的影响存在时间滞后性,与当年载畜量的相关性不明显,而与次年载畜量存在极显著的相关关系。
[Abstract]:Based on the field survey data, the CASA model was used to calculate the aboveground net primary productivity (NPP) of the grassland in Sanjiangyuan from 2000 to 2014, and the relationship between ANPP and climatic factors and carrying capacity was analyzed. The results showed that the average value of grassland ANPP was 27.53gC / m2 from 2000 to 2014, among which 75.81% showed an increasing trend and 24.19% showed a decreasing trend, and there was a significant positive correlation between grassland ANPP and annual mean temperature (P 0.01). The response of ANPP to annual precipitation in different regions was restricted by temperature, and the ANPP increased with the increase of annual mean temperature at 2 鈩，

本文编号：1978630