土壤异养呼吸的测定及其温度敏感性影响因子

被引:22
作者
范志平
王红
邓东周
孙学凯
高俊刚
曾德慧
机构
[1] 中国科学院沈阳应用生态研究所大青沟沙地生态实验站
关键词
土壤异养呼吸; 测定方法; 温度; 土壤含水量; 土壤有机碳; Q10;
D O I
10.13292/j.1000-4890.2008.0232
中图分类号
S154 [土壤生物学];
学科分类号
071012 ; 0713 ;
摘要
土壤异养呼吸主要指土壤中微生物分解有机质释放CO2的过程,是陆地生态系统中土壤碳的主要净输出途径,土壤异养呼吸与净初级生产力的差值是决定生态系统碳源/汇的关键。本文介绍了土壤异养呼吸的测定方法———室内培养的去根土壤样品培养和原状土柱培养,以及野外原位测定的根排除法、环割法和同位素法等操作方法的优缺点以及适用范围。在土壤异养呼吸的研究方面,土壤异养呼吸温度敏感性(Q10)是碳循环研究的重要方面之一,温度、水分以及土壤呼吸底物是影响Q10的主要因子,一般情况下,随着温度的升高,Q10下降;土壤含水量过低或过高时,Q10降低;土壤有机碳的有效性影响着土壤异养呼吸对温度变化的响应程度,当有效性降低时Q10下降,不同周转时间的有机碳的温度敏感性也不相同,活性有机碳的温度敏感性较惰性有机碳的温度敏感性低。
引用
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页码:1221 / 1226
页数:6
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