华北落叶松与胡枝子叶凋落物混合分解及其对土壤养分的影响  

The decomposition characteristics and their effect on soil nutrients of leaf litter mixtures of Larix principis-rupprechtii and Lespedeza bicolor

作　　者：贺红月 牟洪香[1] 马长明[1] 单媛媛[1] HE Hong-yue;MU Hong-xiang;MA Chang-ming;SHAN Yuan-yuan(College of Forestry,Agricultural University of Hebei,Baoding 071000,China)

机构地区：[1]河北农业大学林学院,河北保定071000

出　　处：《河北农业大学学报》2018年第5期55-61,共7页Journal of Hebei Agricultural University

基　　金：国家科技支撑计划项目(2015BAD09B01)资助

摘　　要：为深入认识华北落叶松(Larix principis-rupprechtii)叶凋落物分解特征及与伴生植物胡枝子(Lespedeza bicolor)间的关系,本试验采用野外凋落物网袋分解法,在华北落叶松人工林中设置了4种不同质量混合比例的叶凋落物处理(即纯华北落叶松,华北落叶松和胡枝子(3∶1),华北落叶松和胡枝子(1∶1),华北落叶松和胡枝子(1∶3)),研究了华北落叶松叶凋落物分解及土壤养分变化规律。结果表明:胡枝子叶凋落物能促进华北落叶松叶凋落物的分解,随着分解期的延长以及胡枝子叶凋落物比例的增加,促进作用越来越明显;随分解期的延长,叶凋落物中的N、P呈上升趋势,而K、C呈下降趋势,除C外,混合叶凋落物中的N、P、K含量均高于纯华北落叶松,且随着胡枝子比例的增加而增加;除速效P外,随着胡枝子叶凋落物比例的增大,土壤中的碱解N、速效K、有机质和pH值含量均呈现上升趋势。此结果为促进华北落叶松叶凋落物的分解,维持华北落叶松人工林地力提供理论依据。The study aims to further understand the litter decomposition characteristics of Larix principis-rupprechtii leaf litter and its relationship with Lespedeza bicolor.This study used the field litter bag experiment to set it in Larix principis-rupprechtii plantation.To study litter decomposition and soil nutrient dynamic change of Larix principis-rupprechtii leaf litter,four mixture proportions treatments were set up:pure Larix principis-rupprechtii litter,75%Larix principis-rupprechtii litter mixed with 25%Lespedeza bicol or,50%Larix principis-rupprechtii litter mixed with 50%Lespedeza bicol or,and 25%Larix principis-rupprechtii litter mixed with 75%.The results showed that:the admixture of Lespedeza bicolor leaf litter could significantly promote Larix principis-rupprechtii litter decomposition.The effect was more obvious as the decomposition proceeded and the proportion of Lespedeza bicol or leaf litter increased;as the leaf litter mixture decomposition proceeded,N and P contents in leaf litter showed an increase tendency,while K and C contents presented an opposite tendency.In addition to organic carbon,compared to pure Larix principis-rupprechtii leaf litter,mixtures containing Lespedeza bicolor litter presented increased contents of N,P,K,and the nutrient contents of mixed leaf litter increased with increasing proportion of Lespedeza bicolor litter;in addition to available P,the contents of available N,available K,organic matter and pH in the soil increased with increasing proportion of Lespedeza bicolor litter.This result provides a theoretical basis for promoting the decomposition of leaf litter of Larix principis-rupprechtii and maintaining the soil fertility of Larix principis-rupprechtii plantation.

关 键 词：华北落叶松 胡枝子 混合分解 分解速率 土壤养分 

分 类 号：S791.22[农业科学—林木遗传育种]