常绿阔叶林与杉木林的土壤碳矿化潜力及其对土壤活性有机碳的影响

被引：58

作者：

王清奎

汪思龙

于小军

张剑

刘燕新

机构：

[1] 湖南会同森林生态系统国家野外科学观测研究站

来源：

生态学杂志 | 2007年 / 12期

关键词：

碳矿化; 微生物碳; 可溶性有机碳;

D O I：

10.13292/j.1000-4890.2007.0366

中图分类号：

S714 [森林土壤学];

学科分类号：

0903 ; 090301 ;

摘要：

采用室内土壤培养法,比较分析了湖南省会同地区常绿阔叶林、杉木纯林土壤有机碳的矿化速率和累计矿化量,分析了有机碳矿化量与土壤活性有机碳初始含量的关系。结果表明:常绿阔叶林土壤有机碳矿化速率和累计矿化量均显著高于杉木纯林。在培养的第21天,在培养温度为9℃和28℃条件下,常绿阔叶林0～10和10～20cm土层的土壤有机碳累计矿化量为杉木纯林的1.7～2.7倍。常绿阔叶林土壤有机碳矿化释放的CO2-C分配比例高于杉木纯林。林地土壤有机碳矿化量受土壤微生物碳、可溶性有机碳初始含量的影响(P<0.01)。土壤有机碳矿化使土壤微生物碳增加而可溶性有机碳下降,但变化幅度均不大。温度从9℃升高到28℃后,林地土壤有机碳矿化速率提高3.1～4.5倍;2林地有机碳矿化对温度的敏感性无显著差异。

引用

页码：1918 / 1923

页数：6

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