[1]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(03):78-81.
　YANG Yang,WANG Bai-qun,LI Yu-jin.Driving Effect of Alfalfa (Medicago sativa L.) on Dynamics of Soil Organic Carbon and Nitrogen in Dryland[J].Research of Soil and Water Conservation,2012,19(03):78-81.
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苜蓿对旱地土壤有机碳氮变化的驱动作用

《水土保持研究》[ISSN:1005-3409/CN:61-1272/P] 卷: 19 期数: 2012年03期 页码: 78-81 栏目: 出版日期: 2012-06-20
Title:
Driving Effect of Alfalfa (Medicago sativa L.) on Dynamics of Soil Organic Carbon and Nitrogen in Dryland
作者:
杨洋1, 王百群1,2,3, 李玉进1
1. 西北农林科技大学 资源环境学院, 陕西 杨凌 7121001;
2. 西北农林科技大学 水土保持研究所, 黄土高原土壤侵蚀与旱地农业 国家重点实验室, 陕西 杨凌 712100;
3. 中国科学院 水利部 水土保持研究所, 陕西 杨凌 712100
Author(s):
YANG Yang1, WANG Bai-qun1,2,3, LI Yu-jin1
1. College of Resources and Environment, Northwest A & F University, Yangling, Shaanxi 712100, China;
2. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A & F University, Yangling, Shaanxi 712100, China;
3. Institute of Soil and Water Conservation, Chinese Academy of Sciences, Ministry of Water Resources, Yangling, Shaanxi 712100, China
关键词:
旱地; 苜蓿; 土壤有机碳; 土壤全氮; 微粒有机质
Keywords:
dryland; Alfalfa (Medicago sativa L.); soil organic carbon; soil total nitrogen; particulate organic matter
分类号:
S158.3
摘要:
根据旱地长期定位试验和分离土壤有机质中微粒有机质及矿物结合有机质的方法，研究了长期生长苜蓿对土壤有机碳、全氮变化的驱动作用。结果表明：不施肥条件下，苜蓿地土壤有机碳、全氮的含量比裸地土壤中的含量明显增加，土壤有机碳和氮库中的微粒有机碳、氮的含量没有显著增加，而增加的有机碳、氮主要分布在矿物结合有机碳、氮组分中。在施用有机肥及氮、磷化肥条件下，苜蓿地土壤有机碳和全氮的含量显著地提高，增加的有机碳、氮几乎平均地分布在微粒有机碳、氮和矿物结合有机碳、氮组分中。由此表明，保持适宜的苜蓿生产力并采用合理的施肥措施，长期生长苜蓿能够有效地驱动土壤固定有机碳和氮素，从而保持和提高土壤肥力。
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.

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备注/Memo

收稿日期:2012-3-10;改回日期:2012-4-23。
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（XDA05050504）；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（10502-T2）
作者简介:杨洋（1986- ），男，陕西武功人，硕士研究生，主要从事土壤生态与土壤地理信息系统研究。E-mail：popguy@yeah.net
通讯作者:王百群（1968- ），男，陕西渭南人，博士，副研究员，从事土壤有机碳氮循环研究。E-mail：bqwang@ms.iswc.ac.cn

更新日期/Last Update: 1900-01-01