树种和凋落物对杉木林土壤微生物性质的影响  

Effects of Broad-leaved Trees and Litter on Productivity and Soil Microbes of Chinese Fir Plantation

作　　者：张伟东[1,2] 汪思龙[1] 杨会侠[1,2] 于小军[3] 

机构地区：[1]中国科学院沈阳应用生态研究所,沈阳110016 [2]中国科学院研究生院,北京100049 [3]中国科学院会同森林生态实验站,会同418307

出　　处：《应用与环境生物学报》2010年第2期168-172,共5页Chinese Journal of Applied and Environmental Biology

基　　金：中国科学院知识创新工程重要方向项目(Nos.KZCX2-YW-405,KZCX2-YW-413)资助~~

摘　　要：调查了两个阔叶树种(固氮树种桤木Alnus cremastogyne Burkill和非固氮树种五角枫Acer mono Maxim)及凋落物施放对杉–阔混交林生物量和土壤微生物性质的影响.结果表明,杉–阔混交林中杉木生物量没有显著差异(P>0.05),杉木–桤木混交林总生物量比杉木–五角枫多200%(P<0.05),增加的生物量源于阔叶树种的差异.凋落物对两个类型混交林的生物量都没有产生显著影响(P>0.05).桤木混交处理0～10cm层土壤的土壤有机碳增加了16.8%,而土壤基础呼吸和呼吸熵下降了13.1%和16%.覆盖凋落物使0～10cm层的微生物量碳增加了10.8%,此外,树种和凋落物对土壤基础呼吸和呼吸熵有显著的交互作用(P<0.05).土壤有机碳和树木的生物量呈显著的正相关(R=0.775,P=0.005,N=12).不考虑处理间的差异,土壤微生物量碳与土壤有机碳(R=0.438,P=0.032,N=24)、可溶性有机碳(R=0.0.541,P=0.006,N=24)具有显著的相关性.混交林树种的选择和凋落物对杉–阔混交林林地土壤微生物学性质都具有重要的作用.The effects of broad-leaved tree introduction and litter formation on the productivity and soil microbial properties were investigated in the Chinese fir [Cunminghamia lanceolata （Lamb） Hook] plantation. The results showed that the productivity was increased by 200% after the introduction of N-fixing Alnus cremastogyne （AC） compared with that of non- N-fixing Acer mono （AM） , and the increment was obtained from A. cremastogyne. The productivity of fir was not affected by tree species （P〉0.05）. A. cremastogyne increased the total organic C by 16.8%, and decreased soil basal respiration and qCO2 by 13.1% and 16% in 0~10 cm soil, respectively. The microbial biomass C in soil at 0-10 cm depth was increased by 10.8% by litter （P〉0.05）. Furthermore, the tree species and litter had significant interactive effects on soil basal respiration and qCO2 （P〉0.05）. The total organic C in 0-10 cm soil was positively related with the productivity of tree （R^2=0.775, P=0.005, N=12）, and the microbial biomass C was significantly related with total organic C （R^2=0.438, P=0.032, N=24）. The results suggested that the tree species and litter were both important to soil microbial properties in mixed plantation. Fig 3, Tab 2, Ref 23

关 键 词：杉木 固氮树种 凋落物 生物量 微生物量碳 呼吸熵 

分 类 号：S714.33[农业科学—林学] S791.270.2