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[1]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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Driving Effect of Alfalfa (Medicago sativa L.) on Dynamics of Soil Organic Carbon and Nitrogen in Dryland

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 19 Number of periods: 2012 03 Page number: 78-81 Column: Public date: 2012-06-20

Title:: Driving Effect of Alfalfa (Medicago sativa L.) on Dynamics of Soil Organic Carbon and Nitrogen in Dryland

Author(s):: YANG Yang¹, WANG Bai-qun^1,2,3, 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

Keywords:: dryland; Alfalfa (Medicago sativa L.); soil organic carbon; soil total nitrogen; particulate organic matter

CLC:: S158.3

DOI:: -

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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