不同土地利用对土壤有机碳储量及土壤呼吸的影响  

Effects of different land use types on soil organic carbon storage and soil respiration

作　　者：赵竑绯[1] 赵阳[1] 徐小牛[1] 

机构地区：[1]安徽农业大学林学与园林学院,合肥230036

出　　处：《生态学杂志》2012年第7期1738-1744,共7页Chinese Journal of Ecology

基　　金：国家科技支撑计划项目(2009BADA6B05);全球变化研究国家重大科学研究计划项目(2010CB950602)资助

摘　　要：为了探讨土地利用方式对土壤碳储及土壤呼吸的影响,对安徽沿淮洼地杞柳纯林、杞柳-杨树混交林及杨树纯林3种不同土地利用方式下土壤有机碳储量及土壤呼吸特点进行了比较。结果表明:杞柳纯林、杞柳-杨树混交林、杨树纯林0～30cm土壤有机碳含量分别为6.80、8.50和7.71g·kg-1,土壤有机碳密度分别为2.88、3.26和2.95kg·m-2,土壤有机碳含量和土壤碳密度随土层深度的增加而降低。不同土地利用类型土壤呼吸年平均值分别为1.68μmol·m-2·s-1(杞柳纯林)、2.33μmol·m-2·s-1(杞柳-杨树混交林)、1.61μmol·m-2·s-1(杨树纯林),土壤呼吸日均值最高出现在夏季(6.64μmol·m-2·s-1),最低为冬季(0.13μmol·m-2·s-1)。相关分析表明,土壤呼吸速率与地表气温之间呈显著的指数关系,杞柳纯林、杞柳-杨树混交林、杨树纯林的相关系数R2分别为0.71、0.62、0.54。杞柳-杨树混交林较杞柳纯林有利于土壤有机碳的固定,杞柳纯林土壤有机碳储量偏低,与其粗放经营有关。在今后的栽植管理中,应采取合理的耕作施肥措施,在提高土壤肥力的同时增强土壤的碳固定。To understand the effects of land use type on soil carbon storage and soil respiration,a comparative study was made to study the characteristics of soil carbon storage and soil respiration under three different land use types,i.e.,pure willow plantation（WP）,willow-poplar mixed plantation（WPP）,and pure poplar plantation（PP） on the lowlands along the Huaihe River in Funan of Anhui Province,East China.The organic carbon storage in 0-30 cm soil layer in WP,WPP,and PP was 6.80,8.50 and 7.71 g·kg-1,and the corresponding organic carbon density was 2.88,3.26,and 2.95 kg·m-2,respectively.Under the same land use types,both the soil organic carbon storage and density decreased with soil depth.The mean annual soil respiration rate in WP,WPP,and PP was 1.61,2.33 and 1.61 μmol·m-2·s-1,respectively,and the mean daily soil respiration rate was the maximum（6.64 μmol·m-2·s-1） in summer and the minimum（0.13 μmol·m-2·s-1） in winter.There was an exponential relationship between soil respiration rate and ground surface air temperature,with the R2 value being 0.71 for WP,0.62 for WPP,and 0.54 for PP.The WPP was beneficial to the sequestration of soil organic carbon,as compared to WP,and the lower soil organic carbon storage in WP was related to its extensive management.It was suggested that in the future forest management,reasonable tillage and fertilization should be taken to improve soil fertility and enhance soil carbon sequestration.

关 键 词：土地利用 土壤有机碳 土壤呼吸 地表气温 

分 类 号：S714[农业科学—林学]