森林与环境学报2016，Vol.36Issue(4)：416-422,7.DOI:10.13324/j.cnki.jfcf.2016.04.006
间伐对杨树人工林土壤微生物量和氮含量的影响
Effects of thinning intensity and method on soil microbial biomass and nitrogen content in the poplar plantations
摘要
Abstract
Based on the existed problems for large diameter timber cultivation of poplar plantations, four thinning treatments ( CK, 30% lower thinning, 50% lower thinning and 50% mechanical thinning ) were designed, and the dynamics in the contents of inorganic nitrogen, dissolved organic nitrogen (DON), microbial biomass nitrogen (MBN) and carbon (MBC) under different thinning treatments were monthly investigated at two soil depths. The results indicated that thinning treatments modified the soil temperature and moisture, and consequently intensive thinning treatments ( 50% lower thinning and 50% mechanical thinning ) significantly improved soil MBC and MBN contents, with the order of 50% mechanical thinning>50% lower thinning>30% lower thinning>CK during the growing season, while showing the opposite trend during the non￣growing season. Intensive thinning treatments also significantly increased inorganic nitrogen content of the soil, but no significant difference was observed between 50%lower thinning and 50% mechanical thinning. Soil inorganic nitrogen was mainly in the form of nitrate nitrogen, and showed an obvious seasonal variation. Intensive thinning treatments enhanced DON content, but a significance was only detected in summer and fall. From the view of soil depths, the contents of soil microbial biomass, inorganic nitrogen and dissolved organic nitrogen were higher at 0-10 cm than at 10-20 cm soil, showing a clear surface aggregation characteristics. Results from this study would provide some theoretical and technical supports for the sustainable management of the poplar plantations.关键词
杨树/间伐处理/无机氮/水溶性有机氮/微生物量氮/微生物量碳Key words
poplar/thinning treatment/inorganic nitrogen/dissolved organic nitrogen/microbial biomass nitrogen/microbial biomass carbon分类
农业科技引用本文复制引用
林达,DAO Ngoc Chuong,洪森先,田野,方升佐..间伐对杨树人工林土壤微生物量和氮含量的影响[J].森林与环境学报,2016,36(4):416-422,7.基金项目
国家科技支撑计划“阔叶树速生丰产林定向培育技术研究”(2015BAD09B02)；国家重点基础研究发展计划(2012CB419600)。 （2015BAD09B02）
