紫色土丘陵坡地恢复过程中土壤微生物生物量碳与水溶性有机碳变化特征  

Dynamics of Soil Microbial Biomass Carbon and Soil Water Soluble Organic Carbon along Re-vegetation Chronosequences on Hillslope Land with Purple Soils

作　　者：杨宁[1,2] 杨满元[1] 邹冬生[2] 林仲桂[1] 付美云[1] 

机构地区：[1]湖南环境生物职业技术学院园林学院,湖南衡阳421005 [2]湖南农业大学生物科学技术学院,湖南长沙410128

出　　处：《草地学报》2016年第4期812-818,共7页Acta Agrestia Sinica

基　　金：湖南省科技厅项目(S2006N332);湖南省教育厅科学研究项目(16C0559);湖南省林业科技创新计划项目(XLK201341);湖南省衡阳市科技计划项目(2014KN27);湖南环境生物技术学院南岳学者项目资助

摘　　要：为了研究湖南省衡阳市紫色土丘陵坡地恢复过程中土壤微生物生物量碳（SMBC）与水溶性有机碳（SWSOC）的变化特征。采用空间序列代替时间序列的方法,选用立地条件基本相似的草坡阶段（GT）、草灌阶段（MT）、灌丛阶段（FX）、灌乔阶段（FA）、乔木阶段（AR）和顶极阶段（TV）,通过调查取样和试验分析,对不同恢复阶段的0～10,10～20和20～40cm土层土壤的SMBC、土壤微生物熵（SMQ）、SWSOC、水溶性有机碳与土壤有机碳的比值（SWSOC/SOC）、土壤基础呼吸（SBR）的变化规律以及他们与土壤理化性质的关系进行了研究。结果表明：SMBC和SBR随着土层深度的增加而减小,随着恢复的进行而增加;SMQ随着土层深度的增加和恢复进行而增加;在不同的恢复阶段,SWSOC均随着土层深度的增加而减小,在0～10cm土层,SWSOC随着恢复的进行而增加,在10～20和20～40cm土层,SWSOC随着恢复的进行先增后减;SWSOC/SOC随着土层深度的增加而增加,随着恢复的进行而减小;SMBC,SMQ,SWSOC,SBR均与土壤理化性质存在密切的相关性。研究表明,植被恢复有利于土壤质量的提高和土壤有机碳库的累积。The purpose of this study was to study the dynamics of SMBC（Soil microbial biomass carbon）and SWSOC（Soil water soluble organic carbon）along re-vegetation chronosequences on hillslope land with purple soils in Hengyang City of Hunan Province.By using the space for time method,six typical sampling plots（grassplot（GT）,meadow thichet（MT）,frutex（FX）,frutex and arbor（FA）,arbor（AR）,and top-level vegetation（TV））were selected to explore the variable regulations of SMBC,SMQ（Soil microbial quotient）,SWSOC,SWSOC/SOC,SBR（Soil basal respiration）in 0～10,10～20and 20～40cm soil layers and the relationship between them and soil physio-chemical properties.The six communities were similar and typical,and denoted six different successive stages on hillslope land with purple soils in Hengyang City of Hunan Province.The results showed that：The content of SMBC and SBR decreased with increasing soil depth but increased with the process of re-vegetation;SMQ increased with increasing soil depth and with the process of re-vegetation;SWSOC content decreased with increasing soil depth in different re-vegetation stages;in 0～10cm soil layer,SWSOC content increased with the process of re-vegetation,while in 10～20and 20～40cm soil layers,SWSOC content decreased after an initial increase;SWSOC/SOC increased with increasing soil depth,but decreased with the process of re-vegetation;there were close correlations between SMBC,SMQ,SWSOC and SBR and soil physic-chemical properties.Allthe results indicated that it was essential to take strong measures to accelerate the re-vegetation and help to improve soil quality and accumulate soil organic carbon on hillslope land with purple soils in Hengyang City of Hunan Province.

关 键 词：土壤微生物生物量碳 土壤水溶性有机碳 土壤基础呼吸 植被恢复 紫色土 湖南省衡阳市 

分 类 号：Q14[生物学—生态学] S718[生物学—普通生物学]