秸秆还田对稻田土壤溶液中溶解性有机质的影响  

EFFECT OF WHEAT STRAW INCORPORATION INTO PADDY SOIL ON DISSOLVED ORGANIC MATTER IN SOIL SOLUTION

作　　者：卢萍[1] 单玉华[2] 杨林章[1] 韩勇[1] 

机构地区：[1]中国科学院南京土壤研究所,南京210008 [2]扬州大学环境科学与工程学院,江苏扬州225009

出　　处：《土壤学报》2006年第5期736-741,共6页Acta Pedologica Sinica

基　　金：国家重点基础研究发展规划项目(2005CB121108);江苏省教育厅高校自然科学基金项目资助

摘　　要：研究了麦秆不同方式还田、施用无机氮肥及不同移栽时间对水稻田土壤溶液中溶解性有机碳(DOC)、溶解性有机氮(DON)浓度的影响。结果表明,淹水后土壤溶液中DOC浓度在淹水初期明显增加,而后逐渐下降。添加麦秆这一有机物料,在水稻生长期前2个月内显著提高了DOC,对DON在一段时间内也表现出促进作用,其后差异不显著。施用无机氮肥降低了土壤溶液中DOC、DON浓度。DON的浓度与施肥量呈负相关。水稻推迟移栽,土壤溶液中溶解性有机质(DOM)均显著降低。Dissolved organic carbon （DOC） and dissolved organic nitrogen （DON） are the main components of soil solution and involve in many soil processes. An experiment was carried out to study effect of wheat straw incorporation, nitrogen fertilization and transplant date management on dissolved organic carbon （DOC） and dissolved organic nitrogen （DON） in soil solution in paddy field. Soil solution samples were obtained by centrifuging fresh soil samples. Results show that the concentration of DOC in soil solution was significantly increased at the initial stage of flooding and then decreased gradually regardless of straw incorporation. Wheat straw incorporation significantly increased DOC in the first two months of flooding, and DON, too, in the initial period. Application of inorganic nitrogen led to a decrease in concentrations of DOC and DON. The concentration of DON decreased with fertilizer nitrogen application rate increasing. When the soil was flooded in the same time, delayed transplantation of rice seedlings for three weeks significantly decreased DOM.

关 键 词：秸秆 氮肥 稻田 溶解性有机碳(DOC) 溶解性有机氮(DON) 

分 类 号：S141.4[农业科学—肥料学] S153.5[农业科学—农业基础科学]