秸秆施用后土壤溶解性有机质的动态变化  

Dynamic changes of dissolved organic matter in the soils amended with rice straw

作　　者：周江敏[1] 陈华林[1] 唐东民[1] 祝亮[1] 

机构地区：[1]温州大学生命与环境科学学院,浙江温州325027

出　　处：《植物营养与肥料学报》2008年第4期678-684,共7页Journal of Plant Nutrition and Fertilizers

基　　金：国家自然科学基金(40506015);浙江省自然科学基金项目(Y307068)资助

摘　　要：采用室内培养方法研究了水稻秸秆腐解对土壤溶解性有机质(Dissolved Organic Matter,DOM)含量及其化学组成的动态影响。结果表明,秸秆腐解的前7 d显著增加了土壤溶解性有机碳(DOC)含量,7 d后则无明显影响;同时,秸秆腐解增加了土壤中溶解性糖(DS)、溶解性酚酸(DP)以及芳香族化合物含量。随着腐解时间的延长,溶解性糖在DOC中所占比例下降,而芳香族化合物逐渐上升,表明秸秆腐解不同阶段DOM的化学组成发生了变化。溶解性总氮(TDN)的变化表明,秸秆腐解增加土壤氮素的固定。A laboratory incubation experiment was carried out to investigate the dynamic effect of the decomposition of rice straw in three paddy soils on dissolved organic matter（DOM） and its chemical fraction including dissolved sugars （DS）, dissolved phenols acids（DP） and aromatic compounds. The results showed that the content of DOC increased significantly in the first 7 days of incubation, then no significant changes was observed. Decomposition of rice straw increased DS and DP in the soils. As straw decomposition continued, the percent of DS to DOC decreased while aromatic compounds increased. This suggested that the chemical composition of DOC changed during the period of incubation. The dynamic changes of total dissolved nitrogen（TDN）showed that the decomposition of rice straw induced N immobilization in the soils.

关 键 词：水稻秸秆 溶解性有机碳 溶解性糖 溶解性酚酸 

分 类 号：S141[农业科学—肥料学] S158[农业科学—农业基础科学]