杉木根系和凋落物对土壤微生物学性质的影响  

Effects of root system and litter of Chinese fir on soil microbial properties

作　　者：张伟东[1,2] 汪思龙[1] 颜绍馗[1] 杨会侠[1,2] 徐广标[1] 

机构地区：[1]中国科学院沈阳应用生态研究所会同森林生态实验站,沈阳110016 [2]中国科学院研究生院,北京100049

出　　处：《应用生态学报》2009年第10期2345-2350,共6页Chinese Journal of Applied Ecology

基　　金：中国科学院知识创新工程重要方向性项目(KZCX2-YW-405;KZCX2-YW-413)资助

摘　　要：通过模拟试验,研究了杉木根系和凋落物及其交互作用对土壤微生物学性质的影响.结果表明:杉木根系和凋落物在土壤生态过程中发挥的作用有所不同.与对照相比,杉木根系处理的土壤微生物生物量碳(MBC)、土壤基础呼吸、土壤有机碳(TOC)和微生物熵显著增加,土壤呼吸熵(qCO2)显著降低(P<0.05);凋落物处理中,仅土壤基础呼吸和qCO2显著降低(P<0.05),而MBC、TOC和微生物熵没有显著变化(P>0.05).杉木根系和凋落物对土壤基础呼吸和qCO2的影响具有显著的交互作用.qCO2与土壤可溶性碳(R2=0.325)及TOC(R2=0.209)含量呈显著正相关,说明微生物对碳的利用效率随土壤有机碳数量的增加而降低.与凋落物相比,杉木根系在土壤生态过程中发挥着更重要的作用.A simulation test was conducted to study the effects of the root system and litter of Chi- nese fir （ Cunninghamia lancceolata） on soil microbial properties. After the amendment with C. lancceolata root system, the soil microbial biomass C, basal respiration, total organic C, and microbial quotient increased significantly （ P 〈 0. 05 ）, while soil metabolic quotient （ qCO2 ） presented an opposite trend. In the treatment amended with C. lancceolata litter, the soil basal respiration and qCO2 decreased significantly （P 〈 0. 05） , whereas soil microbial biomass C, total organic C, and microbial quotient had less change. A significant interaction between C. lancceolata root system and litter was observed on soil basal respiration and qCO2. The qCO2 had significant positive correlations with soil total organic C （R^2 = 0. 209） and dissolved organic C （R^2 = 0. 325 ）, suggesting that the C use efficiency of soil microbes decreased with increasing soil organic C content. Comparing with litter, the root system of C. lancceolata played more important roles in soil ecological processes.

关 键 词：杉木 根系 凋落物 微生物碳 土壤呼吸熵 土壤总有机碳 

分 类 号：S714.3[农业科学—林学] S791.27