神农架海拔梯度上4种典型森林的土壤呼吸组分及其对温度的敏感性

被引：36

作者：

罗璐 ^{[1
,2
,3
]}

申国珍 ^{[1
,3
]}

谢宗强 ^{[1
,3
]}

周利光 ^{[4
]}

机构：

[1] 中国科学院植物研究所植被与环境变化国家重点实验室

[2] 中国科学院研究生院

[3] 湖北神农架森林生态系统国家野外科学观测研究站

[4] 内蒙古大学生命科学学院

来源：

植物生态学报 | 2011年 / 07期

关键词：

自养呼吸; 异养呼吸; Q10值; 土壤含水量; 土壤温度;

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：

量化森林土壤呼吸及其组分对温度的响应对准确评估未来气候变化背景下陆地生态系统的碳平衡极其重要。该文通过对神农架海拔梯度上常绿阔叶林、常绿落叶阔叶混交林、落叶阔叶林以及亚高山针叶林4种典型森林土壤呼吸的研究发现:4种森林类型的年平均土壤呼吸速率和年平均异养呼吸速率分别为1.63、1.79、1.74、1.35μmolCO2·m-2·s-1和1.13、1.12、1.12、0.80μmolCO2·m-2·s-1。该地区的土壤呼吸及其组分呈现出明显的季节动态,夏季最高,冬季最低。4种森林类型中,阔叶林的土壤呼吸显著高于针叶林,但阔叶林之间的土壤呼吸差异不显著。土壤温度是影响土壤呼吸及其组分的主要因素,二者呈显著的指数关系;土壤含水量与土壤呼吸之间没有显著的相关关系。4种典型森林土壤呼吸的Q10值分别为2.38、2.68、2.99和4.24,随海拔的升高土壤呼吸对温度的敏感性增强,Q10值随海拔的升高而增加。

引用

页码：722 / 730

页数：9

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