摘要
土壤溶解性有机质及其可利用性与土壤质量密切相关。通过研究秸秆不同还田方式(粉碎还田、覆盖还田、高茬还田)对农田土壤溶解性有机碳的影响,探讨了土壤溶解性有机碳对土壤质量的贡献。水溶性有机碳(WSOC)和热水溶性有机碳(HWSOC)通过冷水和热水提取获得。结果表明:秸秆还田能够增加土壤有机质的含量,影响土壤中水溶性有机碳和热水溶性有机碳的含量。在粉碎还田、覆盖还田、高茬还田处理中,粉碎还田的农田土壤中WSOC和HWSOC的含量比覆盖还田、高茬还田的高,粉碎还田的农田土壤中的WSOC和HWSOC占土壤有机碳的百分比也最高。另外,WSOC和HWSOC与土壤呼吸有很好的相关性(相关系数分别为0.75,0.85)。
Soluble organic matter and its biodegradability are important in relation to soil quality. The objective of this study was to evaluate the quantity of soluble organic matter in soil under different stock return practices, i.e. crush, high stubble and mulch. Water soluble organic matter （WSOC） and hot water-soluble organic matter （HWSOC） were extracted in cold and hot （80 ℃） water. The results show that the concentration of WSOC and HWSOC in crush treatment is higher than the other two treatments. Furthermore, the proportion of WSOC and HWSOC in soil organic carbon is highest in the crush treatment. Simultaneously, soil respiration was determined by incubation method. Soil respiration is positively related to WSOC and HWSOC with relation coefficient 0.75 and 0.85.
出处
《生态环境》
CSCD
北大核心
2006年第1期80-83,共4页
Ecology and Environmnet
基金
中国科学院知识创新工程项目(KZCX-SW-416)
中国科学院沈阳应用生态研究所创新基金项目(C12SC-SCXMS0303)
关键词
秸秆还田
水溶性有机碳
热水溶性有机碳
土壤呼吸
stock return
water soluble organic carbon
hot water soluble organic carbon
soil respiration
