内蒙古温带草原典型草地生态系统生产力对水分在不同时间尺度上的响应

被引:14
作者
郭群 [1 ]
李胜功 [1 ]
胡中民 [1 ]
赵玮 [1 ,2 ]
王敏 [3 ]
机构
[1] 中国科学院地理科学与资源研究所生态系统网络观测与模拟重点实验室
[2] 中国科学院大学
[3] 环境保护部环境与经济政策研究中心
关键词
温带草原; 生产力; 降水;
D O I
暂无
中图分类号
S812 [草地学、草原学];
学科分类号
090503 ; 0909 ;
摘要
水分是干旱、半干旱区草地生态系统生产力的主要限制因素,但水分如何影响生产力的季节内变异,以往研究相对不足。本研究以内蒙古温带典型草原为研究对象,基于多通道自动原位监测箱系统获得的生态系统日尺度总初级生产力(GPP)及遥感植被归一化指数估算年尺度的地上净初级生产力数据,在不同时间尺度上研究了水分对生产力的影响。结果表明:年降水量对该典型草原草地生态系统地上净初级生产力年际变异无显著影响,但土壤水分显著影响GPP的季节变异,土壤水分解释了GPP季节变异的22%;其他环境因子对生产力的季节变异也有一定影响;温度是生态系统处于干旱时GPP的主要限制因素,GPP随温度的升高而降低;而辐射是生态系统处于湿润时GPP的主要限制因素,GPP随辐射的升高而升高。本研究结果将有利于提升未来降水格局改变对草地生态系统生产力影响的认识。
引用
收藏
页码:616 / 623
页数:8
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