土地利用变化对土壤及团聚体结合有机碳的影响  

Effects of Land-use Change on Soil and Aggregate-Associated Organic Carbon

作　　者：孔雨光[1] 张金池[1] 张东海[1] 王洪[1] 崔志华[1] 陶宝先[1] 

机构地区：[1]南京林业大学森林资源与环境学院,江苏南京210037

出　　处：《中南林业科技大学学报》2009年第2期39-44,共6页Journal of Central South University of Forestry & Technology

基　　金：国家"十一五"科技支撑计划项目(2006BAD03A140301)

摘　　要：选取苏北淤泥质海岸土地利用变化过程中的海滩裸地、芦苇Phragmites communis地、小麦Triticum aestivum L.田及水杉Metasequoia glyptostroboides Hu＆ Cheng林地4种典型土地利用类型为研究对象，采用于筛法研究了土地利用变化对表层（0～10cm）土壤及其不同粒级土壤团聚体结合有机碳的影响．结果表明：土地利用变化对全土及团聚体有机碳含量、储量均有显著影响；土地利用方式由海滩裸地转变为芦苇地及由芦苇地开发为农田或水杉林地后，全土及各粒径团聚体结合有机碳含量及储量均有显著提高；水杉林地全土及各粒径团聚体有机碳含量、储量均大于农田土壤，芦苇地转变为水杉林地比转变为农田土壤更能有效地固定有机碳；苏北淤泥质海滩冲积形成后，土壤具有固碳作用，芦苇地、农田及水杉林地0～10cm土层碳汇作用分别为5156．84、11276．08和13476．18kg·hm-2．Four typical land-use patterns, namely, coastal bare land, costal bulrush land, wheat land and water-fir land, in the silting coastal area in northern Jiangsu Province were selected as samples to study the effects of land-use change on surface soil （0-10 cm layer） and aggregate-associated organic carbon in the soil. Results show that the content and reserve of the organic carbon associated with total soil and aggregates are significantly affected by land-use change; that the content and reserve associated with total soil and all sizes of aggregates are both remarkably improved after a conversion of land-use pattern from coastal bare land to bulrush land and then to wheat or water-fir land; that those of water-fir land are bigger than those of wheat land, indicating that the soil of water-fir land can sequestrate carbon more effectively than that of cropland; and that the soil of the alluvial coast in northern Jiangsu Province is a carbon sink, sequestrating in the 0-10 cm layer 5 156.84 kgC for bulrush land, 11 276.08 kgC for farmland and 13 476. 18 kgC for water-fir land.

关 键 词：生态学 土地利用方式 淤泥质海岸 土壤有机碳 团聚体结合碳 

分 类 号：S152.4[农业科学—土壤学]