杉木与阔叶树叶凋落物混合分解对土壤活性有机质的影响  

Effects of Cunninghamia lanceolata-broadleaved tree species mixed leaf litters on active soil organic matter

作　　者：王清奎[1] 汪思龙[1] 于小军 张剑[1] 刘燕新[1] 

机构地区：[1]中国科学院沈阳应用生态研究所,沈阳110016 [2]湖南会同森林生态系统国家野外科学观测研究站,湖南会同418307

出　　处：《应用生态学报》2007年第6期1203-1207,共5页Chinese Journal of Applied Ecology

基　　金：中国科学院知识创新工程重要方向项目(KZCX2YW405);国家自然科学基金资助项目(30470303)

摘　　要：通过室内培养,研究了杉木叶凋落物及与桤木、刺楸和火力楠混合叶凋落物对土壤活性有机质的影响.结果表明:添加叶凋落物显著地增加了土壤微生物碳、氮及土壤呼吸强度和可溶性有机碳含量.其中,添加杉-阔混合叶凋落物对土壤活性有机质的增加效应大于纯杉木叶凋落物.在培养后期(第135天),添加纯杉木叶凋落物和杉-阔混合叶凋落物处理土壤微生物碳含量分别比对照土壤高49%和63%,微生物氮高35%和75%,土壤呼吸强度高65%和100%,可溶性有机碳含量高66%和108%.添加叶凋落物对土壤微生物熵和微生物C/N的影响不显著(P>0·05).With incubation test, this paper studied the effects of Cunninghamia lanceolata leaf litter and its mixture with the litters of main broadleaved tree species in subtropical China, such as Alnus cremastogyne, Kalopanax septemlobus and Michelia macclurei on active soil organic matter. The results showed that adding leaf litters into soil could significantly increase soil microbial biomass C and N, respiration rate and dissolved organic C, and mixed leaf litters were more effective than C. lanceolata leaf litter in increasing soil dissolved organic C. By the end of the incubation, the increment of soil microbial biomass C and N, respiration rate, and dissolved organic C in treatments C. laneeolata leaf litter and C. laneeolata-broadleaved tree species mixed leaf litters was 49% and 63%, 35% and 75%, 65% and 100%, and 66% and 108%, respectively, compared with control. The addition of leaf litters had no significant effects on soil microbial quotient and microbial biomass C/N ratio.

关 键 词：杉木 混合叶凋落物 土壤微生物量 可溶性有机碳 

分 类 号：S714[农业科学—林学]