去根处理对樟树林土壤呼吸的影响  

Effects of root exclusion on soil respiration in Cinnamomum camphora plantation

作　　者：刘智[1] 闫文德[1] 王光军[1] 郑威[1] 梁小翠[1] 宿少锋[1] 

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

出　　处：《中南林业科技大学学报》2012年第5期120-124,共5页Journal of Central South University of Forestry & Technology

基　　金："十二五"农村领域国家科技计划课题(2011BAD38B0204);教育部新世纪优秀人才支持计划(NCET-10-0151);湖南省科技厅项目(2010TP4011-3);湖南省教育厅项目(湘财教字[2010]70号);长沙市科技局项目(K1003009-61)

摘　　要：采用LI-8100开路式土壤C通量测定系统,对去根处理的樟树人工林土壤呼吸进行了为期1 a的观测。结果表明:去根处理和对照的土壤呼吸速率均呈现显著的季节性变化,土壤CO2呼吸速率月平均值变化动态呈单峰曲线;对照处理土壤呼吸速率变化范围为1.426～5.641μmol·m-2s-1,去根处理后的土壤呼吸速率范围为1.137～4.257μmol·m-2s-1;去除根系的土壤呼吸速率与5 cm土壤温度之间均呈显著指数相关(P=0.000),与5 cm土壤湿度之间呈二次曲线相关(P=0.012)。根系是影响土壤CO2通量的一个重要因子。Soil respiration was measured with Li-8100 soil CO2 efflux system in Cinnamomum camphora plantation in forest park of Changsha, Hunan, with de-rooting treatments and trenching method, from August 2009 to July 2010. The results show that the soil respiration had a significant seasonal change both in the trenched plots and the control plots. The rates of soil CO2 efflux were about 1.426 - 5.641 umol.m-2.s-1 in the trenched plots, and 1.137 - 4.257 umol.m-2s-1 in the control plots, respectively. The soil respiration rate in the trenched plots exhibited a highly markedly exponential correlation with the soil temperature at 5 cm depth （P =0.000） （ without living roots） and a highly markedly quadric relationship with the soil moisture at 5 cm depth （ P=0.012 ） . The results indicate that the root system was an important factor affecting soil CO2 efflux, soil temperature and soil moisture in forest.

关 键 词：土壤呼吸 樟树人工林 土壤温度 土壤湿度 

分 类 号：S792.23[农业科学—林木遗传育种] S718.516[农业科学—林学]