洞庭湖区耕地利用方式对土壤活性有机碳的影响  

Soil Active Organic Carbon of Farmland Under Different Uses in Dongting Lake Region

作　　者：黄伟生[1] 彭佩钦[1] 苏以荣[1] 黄道友[1] 朱奇宏[1] 

机构地区：[1]中国科学院亚热带农业生态研究所亚热带农业生态重点实验室

出　　处：《农业环境科学学报》2006年第3期756-760,共5页Journal of Agro-Environment Science

基　　金：中国科学院知识创新工程项目(KZCX3-SW-426);国家自然科学基金重点项目(40235057);中国科学院知识创新领域前沿项目(02200220020223)

摘　　要：在洞庭湖区选取典型样区,于2004年3月通过调查和密集取样,测定了各种耕地利用方式(旱地、水旱轮作地、一季稻水田和双季稻水田)的溶解性有机碳(DOC)、微生物生物量碳(MBC)、土壤总有机碳(TOC)的含量,分析了DOC、MBC、TOC的关系。结果表明,(1)DOC含量为水旱轮作地(66.3mg·kg-1)>双季稻水田(64.7mg·kg-1)>一季稻水田(60.1mg·kg-1)>旱地(55.7mg·kg-1),MBC含量为双季稻水田(885.9mg·kg-1)>一季稻水田(730.6mg·kg-1)>水旱轮作地(720.9mg·kg-1)>旱地(488.6mg·kg-1),有机物质的输入量、种植制度和水肥管理是差异存在的重要原因;(2)旱地、水旱轮作地、双季稻水田和一季稻水田的DOC/TOC均值分别为0.32%、0.27%、0.24%、0.24%,其相应的MBC/TOC均值分别为3.02%、2.88%、3.22%、2.91%;(3)DOC、MBC、TOC相互之间极显著相关(P<0.01)。秸秆还田(土)和增加土地复种指数是调控土壤活性有机碳含量的可行措施。The impacts of farmland use type and management practices on dissolved organic carbon （DOC） and microbial biomass carbon （MBC） were investigated. Soil samples （0-15 cm） in Datong town （112° 16′-112°56′E, 28°42′-29°11′N） in Hunan province were collected densely with GPS orientation in March 2004, and historical materials were investigated in typical plots. The content of DOC and MBC, and the relationships between DOC, MBC and TOC in four typical farmland use types （including dry land, flood-drought cultivation land, single cropping rice and double cropping rice） were analyzed in Dongting Lake region. The results showed that： （1） The content of DOC followed the order： flood-drought cultivation land （66.3 mg·kg^-1）〉double cropping rice （64.7 mg. kg^-1）〉single cropping rice （60.1 mg·kg^-1）〉dry land （55.7 g. kg^-1）; the content of MBC was double cropping rice （885.9 mg·kg^-1）〉single cropping rice （730.6 mg·kg^-1）〉flood-drought cultivation land （720.9 mg·kg^-1）〉dry land （488.6 mg·kg^-1）. The significant difference was derived from the distinctness of organic matter input, farming system and management of water and fertilizer; （2） DOC constituted 0.32%, 0.27%, 0.24% and 0.24% of TOC under dry land, flood-drought cultivation land, double cropping paddy field and single cropping paddy field, respectively. MBC constituted 3.02%, 2.88%, 3.22% and 2.91% of TOC under dry land, flood-drought cultivation land, double cropping rice and single cropping rice, respectively. （3） There were highly significant correlations （P 〈0.01） between DOC, MBC and TOC. The results also revealed that straw incorporation and increasing in cropping index could regulate and control soil active organic carbon content in Dongting lake region.

关 键 词：利用方式 耕地 溶解性有机碳 微生物生物量碳 

分 类 号：S153.6[农业科学—土壤学]