土壤温度和水分对油松林土壤呼吸的影响

被引：63

作者：

严俊霞 ^{[1
,2
]}

秦作栋 ^{[3
]}

张义辉 ^{[1
]}

李洪建 ^{[1
]}

机构：

[1] 山西大学黄土高原研究所

[2] 中国科学院遥感应用研究所

[3] 不详

来源：

生态学报 | 2009年 / 29卷 / 12期

关键词：

土壤呼吸; 土壤温度和水分; 关系模型; 油松林; 山西高原;

D O I：

暂无

中图分类号：

S714 [森林土壤学];

学科分类号：

0903 ; 090301 ;

摘要：

用LI-COR6400-09土壤呼吸测定系统,在太原天龙山自然保护区对油松林的土壤呼吸进行了4a测定。结果表明,土壤呼吸具有明显的季节变化特点,最大值出现在8月份,在6～10μmolm-2s-1之间,最小值出现在12月份和3月份,在0.5μmolm-2s-1左右。2005、2006、2007和2008年土壤呼吸CO2的年平均值分别为(4.71±3.74)、(3.08±2.91)、(2.96±2.58)μmolm-2s-1和(2.12±1.54)μmolm-2s-1;4a的CO2总平均值为(3.27±2.95)μmolm-2s-1。4个测定年土壤呼吸的平均值总体差异显著。4个测定年土壤CO2释放C量分别为1103.5、882.8、918.4gm-2和666.3gm-2,总C平均值为892.8gm-2,具有明显的年际差异。指数方程可以很好的表达土壤呼吸与10cm深度土壤温度的关系,R2值4a分别为0.39,0.60,0.68和0.71,Q10值分别为3.10,4.41、4.05和5.18,用4a全部数据计算的Q10值为4.31。土壤水分对土壤呼吸的作用较弱,R2值4a分别仅为0.31、0.25、0.13和0.02,但是夏季土壤干旱对土壤呼吸的抑制作用非常明显,可使土壤呼吸下降50%以上。夏季土壤干旱是导致土壤呼吸年际变化的主要原因。4个包括土壤温度和水分的双变量模型均可以很好地模拟土壤呼吸的季节变化,拟合方程的R2值从0.58到0.79。

引用

页码：6366 / 6376

页数：11

共 23 条

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