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  

Soil carbon mineralization potential and its effect on soil active organic carbon in evergreen broadleaved forest and Chinese fir plantation

作　　者：王清奎 汪思龙[1] 于小军 张剑[1] 刘燕新[1] 

机构地区：[1]湖南会同森林生态系统国家野外科学观测研究站

出　　处：《生态学杂志》2007年第12期1918-1923,共6页Chinese Journal of Ecology

基　　金：中国科学院知识创新工程重要方向项目(KZCX2-YW-405);中国科学院知识创新工程青年人才领域前沿资助项目

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。With incubation test, this paper studied the minerahzation rate and cumulative miner-alized amount of soil organic carbon （C） , and the correlations of the mineralized organic C with the initial content of soil active organic C in evergreen broadleaved forest and Chinese fir （Cun-ninghamia lanceolata） plantation in Huitong region of Hunan Province. The results showed that the mineralization rate and cumulative mineralized amount of soil organic C were significantly higher in evergreen broadleaved forest than in Chinese fir plantation. At the 21st day of incubation at 9 ℃ and 28 ℃ , the cumulative mineralized amount of soil organic C at the soil depths of 0-10 cm and 10-20 cm in evergreen broadleaved forest was 1.7-2.7 times of that in Chinese fir plantation. The proportion of CO2-C released from the mineralization of soil organic C was higher in evergreen broadleaved forest than in Chinese fir plantation. There were significant correlations between the mineralized amount of soil organic C and the initial content of soil dissolved organic C and microbial biomass C （P〈0.01）. The mineralization of soil C increased soil microbial bio-mass C while decreased soil dissolved organic C, but the increment or decrement was not too great. When the incubation temperature raised from 9℃ to 28℃ , soil C mineralization rate in- creased 3.1-4. 5 times, and less difference was observed in the responses of the mineralization rate to temperature change between broadleaved forest and Chinese fir plantation.

关 键 词：碳矿化 微生物碳 可溶性有机碳 

分 类 号：S714[农业科学—林学]