期刊
AGRICULTURE ECOSYSTEMS & ENVIRONMENT
卷 232, 期 -, 页码 93-100出版社
ELSEVIER
DOI: 10.1016/j.agee.2016.07.024
关键词
Alfalfa; Heavy fraction; Land abandonment; Light fraction; Melilotus suaveolens; Soil organic carbon
资金
- National Natural Science Foundation of China [31470496]
- Fundamental Research Funds for the Central Universities [lzujbky-2015-ct02]
- '111' Program [2007B51]
- Program for Innovative Research Teams of Ministry of Education of China [IRT_13R26]
- State Key Laboratory of Frozen Soil Engineering, CAS [52Y552J71]
Revegetation of degraded arable land with legume pasture has been proposed as an effective approach to improve vegetation conditions and control soil erosion on the Loess Plateau, China. This paper investigated the effects of revegetation on soil carbon pool and its fractions. Three treatments (natural revegetation, Medicago sativa L. introduction and Melilotus suaveolens L. introduction) were applied over 11 years from 2003 to 2013 on the semi-arid Loess Plateau; both aboveground biomass and soil organic carbon (SOC) stocks as well as its fractions (i.e., the light-fraction organic carbon (LFOC) and heavy fraction organic carbon (HFOC)) were measured. We found that plant aboveground biomass was greater under Melilotus treatment than under Medicago treatment and natural revegetation in the first two years. Afterward, the aboveground biomass was greatest under Medicago treatment. Medicago treatment yielded higher SOC and HFOC stocks than the other two treatments during the experimental period. After revegetation for 10 years, the SOC stocks at the 0-1.5 m soil layer under Medicago treatment were 52.8 and 44.8 Mg ha(-1) higher than those under natural revegetation and Melilotus treatments, respectively. The mean rates of SOC and HFOC sequestration in the top 20 cm of the soil layer under Medicago treatment were 0.27 and 0.23 Mg ha(-1) year in year 11, which were greater than the other two treatments (0.22, 0.15 and 0.07, 0.03 under the two treatments, respectively). Revegetation through introduction of Medicago to degraded arable land can potentially promote SOC accumulation by enhancing the transformation from LFOC to HFOC on the semi-arid Loess Plateau. (C) 2016 Elsevier B.V. All rights reserved.
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