水土保持研究2012，Vol.19Issue(3)：78-81,4.
苜蓿对旱地土壤有机碳氮变化的驱动作用
Driving Effect of Alfalfa （Medicago sativa L. ） on Dynamics of Soil Organic Carbon and Nitrogen in Dryland
摘要
Abstract
Land use has a significant impact on change in soil organic carbon and nitrogen. The driving effect of alfalfa （Medicago sativa L. ） on the dynamics of soil organic carbon and nitrogen in dryland was studied based the long-term field experiment and the method for separating the soil organic matter into particulate organic matter and mineral-associated organic matter. The level of soil organic carbon （SOC） and nitrogen in the land grown alfalfa without fertilization increased compare with the bare land, the particulate organic carbon （POC） did not demonstrate significant changes whereas the mineral-associated organic carbon （MOC） and nitrogen increased. The status of SOC and N in the land grown alfalfa applied manure and N and P fertilizers showed significant increase compared with that in the land grown alfalfa without fertilizer, and the increased organic carbon and nitrogen distributed in the fraction of POC and MOC, respectively. These results suggest that applying the manure and chemical fertilizer in the alfalfa land and keeping the rational alfalfa productivity is the sustainable way to sequester organic carbon and nitrogen and to improve soil fertility in the semiarid area.关键词
旱地/苜蓿/土壤有机碳/土壤全氮/微粒有机质Key words
dryland/Alfalfa (Medicago sativa L. )/soil organic carbon/soil total nitrogen/particulate organic matter分类
农业科技引用本文复制引用
杨洋,王百群,李玉进..苜蓿对旱地土壤有机碳氮变化的驱动作用[J].水土保持研究,2012,19(3):78-81,4.基金项目
中国科学院战略性先导科技专项-应对气候变化的碳收支认证及相关问题 （）
国家自然科学基金项目（40301024）黄土高原土壤侵蚀与旱地农业国家重点实验室自主课题 （）
