土地利用方式对土壤水溶性有机碳的影响  

Influence of land-use type on soil dissolved organic carbon in the Sanjiang Plain.

作　　者：张金波[1] 宋长春 杨文燕[1] 

机构地区：[1]中国科学院东北地理与农业生态研究所

出　　处：《中国环境科学》2005年第3期343-347,共5页China Environmental Science

基　　金：中国科学院知识创新工程重大项目资助(KZCX1-SW-01);(KZCX1-SW-19);(KZCX3-SW-332)

摘　　要：采集三江平原不同利用方式的土壤,测定土壤水溶性有机碳(DOC)含量,以及E280值、E250/E365和E240/TOC比值,研究土地利用方式对土壤DOC的影响.结果表明,随着土地利用方式的变化,土壤DOC含量变化明显,土地开垦耕作是导致土壤DOC含量降低的主要原因.湿地土壤的开垦耕作,不仅导致土壤DOC数量的减少,而且DOC的质量也在下降.土壤DOC与土壤总有机碳含量呈正相关(R2=0.66),与游离态轻组有机碳的相关性更强(R2=0.84),与土壤重组有机碳呈明显的负相关(R2=0.52).Soils of different land use type were collected for measuring the content of soil dissolved organic carbon (DOC), E280 value and specific values of E250E365 and E240/TOC, and studying the influence of land use type on soil DOC. In the Sanjiang Plain the content of soil DOC changed obviously with changing of land use type; the land cultivation was the main cause of decreasing the content of soil DOC. Wed land cultivation decreased not only the quantity, but also the quality of soil DOC. There was positive relation between soil DOC and soil total organic carbon (R2=0.66), the relation between DOC and free light fraction organic carbon was more strong (R2=0.84); while there was obvious negative relation between DOC and heavy fraction organic carbon (R2=0.52).

关 键 词：水溶性有机碳(DOC) 土地利用 湿地 

分 类 号：X144[环境科学与工程—环境科学]