土地利用方式对中亚热带山地土壤微生物生物量磷的影响  

Effect of land use on soil microbial biomass phosphorus in mid-subtropical zone

作　　者：李胜蓝[1,2] 方晰[1,2] 李岩[1,2] 项文化[1,2] 张仕吉[3] LI Shenglan FANG Xi LI Yan XIANG Wenhua ZHANG Shiji(College of Life Science and Technology State Key Laboratory of Ecological Applied Technology in Forest Area of South China College of Material Science and Technology, Central South University of Forestry and Technology, Changsha, Hunan 410004, China)

机构地区：[1]中南林业科技大学生命科学与技术学院,湖南长沙410004 [2]中南林业科技大学南方林业生态应用技术国家工程实验室,湖南长沙410004 [3]中南林业科技大学材料科学与工程学院,湖南长沙410004

出　　处：《西北农林科技大学学报（自然科学版）》2016年第8期162-170,共9页Journal of Northwest A&F University(Natural Science Edition)

基　　金：国家级林业科技推广项目([2012]61号);国家林业局林业软科学研究项目(2014-R11);中南林业科技大学研究生科技创新基金项目(CX2014B29)

摘　　要：【目的】研究中亚热带山地不同土地利用方式土壤微生物生物量磷（MBP）的含量特征。【方法】在地处中亚热带地区的湖南长沙大山冲选取6种土地利用方式（杉木人工林、次生林（马尾松＋石栎针阔混交林、南酸枣落叶阔叶林、石栎＋青冈常绿阔叶林）、毛竹林和弃荒地）的样地,分别采集其0-15cm和15-30cm土层土壤样品,测定其MBP、全磷（TP）、有效磷（AP）、有机碳（SOC）、全氮（TN）含量,并测定样地的凋落物量和细根生物量,分析MBP与土壤养分（C、N、P）、凋落物量、细根生物量之间的关系。【结果】（1）6种土地利用方式土壤MBP含量均表现为0-15cm土层高于15-30cm土层,不同土地利用方式土壤MBP含量差异显著,毛竹林最高,杉木人工林最低。（2）同一土层,不同土地利用方式土壤TP、AP含量差异显著,弃荒地、毛竹林较高,杉木人工林最低。（3）不同土地利用方式土壤MBP占TP含量百分比差异显著,毛竹林最高,其次是次生林、弃荒地,杉木人工林最低。（4）整个研究区土壤MBP与SOC、TN含量呈极显著正相关,与TP、AP不存在显著的相关性,杉木人工林、次生林土壤MBP与SOC、TP、AP含量呈显著或极显著正相关,但与凋落物量、细根生物量相关性不显著。【结论】不同土地利用方式土壤TP、SOC、TN含量的差异是导致土壤MBP含量差异的主要因素,人为活动（如施肥、耕作措施）是导致土壤MBP含量差异的直接因子之一。【Objective】This research investigated characteristics of microbial biomass phosphorus（MBP）contents with different land use types.【Method】Six sample plots with different land use types（Cunninghamia lanceolata plantation forest,secondary forests（Pinus massoniana＋Lithocarpus glaber mixed forest,Choerospondias axillaries deciduous broad leaved forest,L.glaber＋Cyclobalanopsis glauca evergreen broad-leaved forest）,Phyllostachy edulis plantation,and wasteland）at Dashanchong forest parkin mid-subtropical zone were selected for collecting soil samples from depths of 0-15 and 15-30 centimeter.Contents of MBP,total phosphorus（TP）,available phosphorus（AP）,soil organic carbon（SOC）,total nitrogen（TN）,litter fall and fine-root biomass were measured and correlations between MBP and soil nutrients（C,N,P）,litter fall,and fine-root biomass were analyzed.【Result】（1）MBP contents of six land use types at 0-15 centimeter soil layer were all higher than that at 15-30 centimeter with significant difference among different land use types.The average content was highest in P.edulis plantation and lowest in C.lanceolata plantation forest.（2）At same soil layer,there were significant differences in TP and AP between different land use types.Contents of TP and AP in P.edulis plantation and wasteland were the highest while that in C.lanceolata plantation forest were the lowest.（3）The ratios of MBP to TP under six land use types were also significantly different with highest in P.edulis plantation,followed by secondary forests and wasteland,and the lowest in C.lanceolataplantation forest.（4）MBP contents were significantly correlated with SOC and TN,and were not correlated with TP and AP.MBP contents in C.lanceolataplantation forest and secondary forests were significantly correlated with SOC,TP,and AP,but not correlated with litter fall and fine-root biomass.【Conclusions】Differences in TP,SOC and TN under different land use types were main factors affecting MBP content and human

关 键 词：中亚热带 土地利用方式 山地土壤 微生物生物量磷 

分 类 号：S718.5[农业科学—林学]