干旱胁迫降低了内蒙古羊草草原的碳累积

被引:33
作者
郝彦宾
王艳芬
崔骁勇
机构
[1] 中国科学院研究生院生命科学学院
关键词
碳累积; 干旱; 生态系统呼吸; 总初级生产力; 羊草草原; 净生态系统交换;
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
采用涡度相关法,分析了2004年(平水年)和2005-2006年(干旱年)生长季内蒙古锡林河流域羊草(Leymus chinensis)草原的净生态系统碳交换(net ecosystem exchange,NEE)、总初级生产力(gross primary productivity,GPP)和生态系统呼吸(ecosystem respiration,Re)的季节和年度变化。结果表明:平水年羊草草原的日最大GPP和Re分别为4.89和1.99g C·m-2·d-1,而干旱年GPP和Re分别为1.53-3.01和1.38-1.77g C·m-2·d-1。与平水年相比,干旱年日最大GPP、Re分别下降了38%-68%和11%-12%。平水年羊草草原累积的GPP、Re分别为294和180g C·m-2,而在干旱年分别为102-123g C·m-2和132-158g C·m-2。和平水年相比,干旱年的GPP、Re分别下降了58%-65%和12%-27%。用Van't Hoff模型模拟的8个窄土壤含水量(θ)跨度生态系统呼吸(Re)对土壤温度(Ts)的敏感程度表明:曲线斜率在θ=0.16-0.17m3·m-3范围内达到最大,高于或者低于这个阈值,Re对Ts的敏感度降低。干旱胁迫降低了生态系统生产力和生态系统呼吸量。与平水年相比,干旱年的GPP比Re下降的幅度更大,干旱胁迫降低了内蒙古羊草草原的碳累积,使生态系统由碳汇变为碳源。
引用
收藏
页码:898 / 906
页数:9
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