洞庭湖区滩地不同土地利用类型土壤呼吸动态  

Soil respiration dynamics for different land-use types on the shoreline of Dongting Lake

作　　者：唐洁[1,2] 李志辉[1] 汤玉喜[2] 吴敏[2] 李永进[2] 王胜 

机构地区：[1]中南林业科技大学林学院,湖南长沙410004 [2]湖南省林业科学院,湖南长沙410004 [3]湖南省岳阳市君山区林业局,湖南岳阳410005

出　　处：《浙江农林大学学报》2011年第3期439-443,共5页Journal of Zhejiang A&F University

基　　金："十一五"国家科技支撑计划项目(2006BAD03A15)

摘　　要：土壤呼吸受到多种生物和非生物因素的影响,基于洞庭湖区滩地3种不同土地利用方式和不同时间尺度,分析土壤呼吸动态变化及与环境影响因子的关系,有助于深入了解滩地土壤呼吸变化的机理及精确推算碳的排放。采用LI-8100气体分析仪对洞庭湖区滩地芦苇地、农田、杨树林地土壤呼吸动态进行野外测定,分析不同土地利用类型土壤呼吸速率的日变化和季节变化,并对土壤呼吸速率与近地表温度、0～5 cm土壤含水量、0～5 cm土壤温度、空气湿度等环境因子之间的关系进行相关性分析。结果表明:3种土地利用类型土壤呼吸速率的季节和日变化比较明显,其动态均表现为单峰型,高峰值出现时间存在差异,而最低值大致出现在凌晨5:00;不同土地利用类型土壤呼吸作用强弱表现为芦苇地>杨树林地>农田;3种土地利用类型土壤呼吸速率均与近地表温度、0～5 cm土壤含水量、0～5 cm土壤温度极显著相关(P<0.01);杨树林地土壤呼吸速率与空气湿度呈极显著相关。总之,土壤呼吸主要受到温度和0～5 cm土壤含水量的协同作用。A variety of biotic and abiotic factors influence soil respiration.To contribute to a further understanding of soil respiration dynamics and to help provide an accurate calculation of carbon emissions,the relationship between soil respiration dynamics and environmental factors for three land-use types：reeds,farmland,and poplar forest,along the shoreline of Dongting Lake was field tested using an LI-8100 gas analyzer and analyzed for diurnal and seasonal changes in the soil respiration rate.A correlation analysis of the soil respiration rate among factors of near-surface temperature,0-5 cm soil moisture,0-5 cm soil temperature,and air humidity was conducted.Results showed that the dynamic performance of seasonal and diurnal changes in soil respiration were all single-peaked.Peak value times differed with the lowest value occurring about 5：00 A.M.Soil respiration intensity for land-use type was in the order：reeds poplars farmland with soil respiration rate exemely significantly correlated to near-surface temperature（P0.01）,0-5 cm soil moisture（P0.01）,and 0-5 cm soil temperature（P0.01）.Moreover,there was highly significant correlation between popular forest and air humidity.In total,soil respiration was synergied by soil temperature and 0-5 cm soil moisture（P0.05）.[Ch,2 fig.3 tab.11 ref.]

关 键 词：土壤学 滩地 土壤呼吸 昼夜变化 季节变化 土壤温度 土壤含水量 

分 类 号：S154.1[农业科学—土壤学]