广东省不同土地利用方式对土壤微生物量碳氮的影响  

Effects of different land use patterns on microbial biomass carbon and nitrogen in Guangdong Province

作　　者：徐华勤[1,2] 章家恩[1] 冯丽芳[1] 全国明[1] 毛丹娟[1] 秦钟[1] 

机构地区：[1]华南农业大学农业部生态农业重点开放实验室,广州510642 [2]湖南农业大学农业生态研究所,长沙410128

出　　处：《生态学报》2009年第8期4112-4118,共7页Acta Ecologica Sinica

基　　金：国家重大基础研究发展计划(973项目)资助项目(2006CB100206);国家自然科学基金资助项目(40871118);广东省科技计划资助项目(2006B20601004);广东省自然科学基金资助项目(8151064201000048);中国博士后科学基金资助项目(20080440761)

摘　　要：通过野外调查与室内分析,研究了广东省韶关红壤、广州赤红壤、雷州砖红壤3个地区4种不同土地利用方式（林地、果园、草地和农田）表层土壤（0-20 cm）微生物量C、N特征。研究结果表明：不同土壤类型和不同土地利用方式对土壤微生物量C、N均有一定影响,其中土地利用方式影响更为明显。不同土地利用方式下土壤微生物量C、N差异显著,均表现为果园和林地高于农田和草地。土壤有机C、全N同样以果园较高。而对微生物商分析结果表明,不同的土地利用方式对土壤有机C总量和微生物生物量C的影响程度并不一致。相关分析表明,土壤微生物量C、N与全N、有机C、速效N显著正相关;土壤微生物量C、N之间显著相关,证实土壤微生物量C、N是可以表征土壤肥力的敏感因子。Soil microorganism plays an important role in material cycling and energy transformation in an ecosystem.Due to its sensitivity to environmental changes,soil microorganism is considered to be one of the key indicators to reflect the variation of soil quality.In this paper,field investigations and lab experiments were carried out to study characteristics of microbial biomass carbon（MBC） and microbial biomass nitrogen（MBN） in surface soil（0-20 cm）.Three soil types（including latosolic red soil from Shaoguan,red soil from Guangzhou,and latosol from Leizhou） of Guangdong Province and four land use patterns（including grassland,forest,farmland and orchard）were included in this study.Results showed that there were significant differences between MBC and MBN both respond to different land use patterns and different soil types and such differences were more significant for land use patterns.The MBC and MBN were much higher in the forestland and orchard than those in the farmland and grassland.Results further revealed that total organic carbon（TOC） and total nitrogen（TN） were also higher in the orchard than those in the other three land use pattern.However,compared to land use patterns,soil types had much less impacts on the MBC and MBN.Analysis of microbial quotient showed that land use patterns had different impacts on TOC and MBC.A correlation analysis showed that soil MBC,MBN,TN,TOC,and available N were all significant and positive correlated.The significantly and positively correlation between MBC and MBN suggested that The contents of MBC and MBN significantly correlated to those of SOC and TN,this suggested the contents of soil MBC and MBN were the sensitive indicators for characterizing of changes of soil fertility.

关 键 词：土壤微生物量碳 土壤微生物量碳氮 土壤类型 土地利用方式 

分 类 号：S154[农业科学—土壤学]