Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/j.ecocom.2010.11.003 |
Using the CENTURY model to assess the impact of land reclamation and management practices in oasis agriculture on the dynamics of soil organic carbon in the arid region of North-western China | |
Xu, Wenqiang1,2; Chen, Xi1,2; Luo, Geping1,2; Lin, Qing3 | |
通讯作者 | Xu, Wenqiang |
来源期刊 | ECOLOGICAL COMPLEXITY |
ISSN | 1476-945X |
EISSN | 1476-9840 |
出版年 | 2011 |
卷号 | 8期号:1页码:30-37 |
英文摘要 | Large-scale reclamation of arid land in North-western China over the past 50 years has converted the natural desert landscape into anthropogenic oasis, particularly in the lower part of watersheds. Drastic human activities may have caused the change of soil organic carbon (SOC) in anthropogenic oasis. This study employs the CENTURY model (Version 4.0) to investigate the effects of land reclamation and management practices in oasis agriculture on the dynamic of SOC at the lower part of Sangong river watershed, a typical anthropogenic oasis reclaimed at 50 years ago. Based on field investigation, history of crop rotations, and past farm practices in study area, land management practices were divided into five categories, corresponding five periods, 0-1958, 1959-1984, 1985-1992, 1993-1998 and 1999-2008. The model successfully simulated the SOC dynamics of the top layer soil (0-20 cm) in the different periods. The state of equilibrium of total SOC and the active, slow, and passive carbon pools were built by CENTURY model in 0-1959. Over the 50 years’ cultivation (1959-2008), the mean change in total SOC exhibited complex ways. SOC increased rapidly in the first 2 years (1959-1960) after shrubland reclamation, and declined slowly during the period 1961-1984 and then decreased rapidly from 1985 to 1992. Between 1993 and 1998, it remained relatively stable, and climbed rapidly again during 1999-2008. The trend in total SOC showed "N" shape, i.e., increase, decrease, then increase. Finally, total SOC is greater (8.2%) in 2008 than the original level of SOC under the natural desert shrub. The improvements of land management practices such as ploughing being replaced with no tillage, straw being crushed before returning it to soil, and reasonable application of fertilizers, played a key role in the change in total SOC. Especially, soil carbon sequestration was obviously increased since protective management practices were implemented in 1993, such as no tillage, straw returning to soil, and the balanced fertilization technique. The results were different from the conclusions that loss of soil organic carbon would happen due to reclamation and continuous farming in tropical forests, semiarid grasslands of northern China and Nigerian semiarid Savannah. (C) 2010 Elsevier B.V. All rights reserved. |
英文关键词 | Land reclamation Anthropogenic oasis Crop rotation Fertilization No tillage CENTURY model |
类型 | Article |
语种 | 英语 |
国家 | Peoples R China |
收录类别 | SCI-E |
WOS记录号 | WOS:000287620000004 |
WOS关键词 | CROPPING SYSTEMS ; GRASSLAND ; STORAGE ; SEQUESTRATION ; CULTIVATION ; AGGREGATE ; MATTER ; STOCKS ; PLANTATIONS ; CONVERSION |
WOS类目 | Ecology |
WOS研究方向 | Environmental Sciences & Ecology |
来源机构 | 中国科学院新疆生态与地理研究所 |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/167800 |
作者单位 | 1.Chinese Acad Sci, Xinjiang Inst Ecol & Geog, Key Lab Oasis Ecol & Desert Environm, Urumqi 830011, Xinjiang, Peoples R China; 2.Chinese Acad Sci, XIEG UCR Int Ctr Arid Land Ecol, Urumqi 830011, Xinjiang, Peoples R China; 3.Water Resources Dept Xinjiang, Urumqi 830000, Xinjiang, Peoples R China |
推荐引用方式 GB/T 7714 | Xu, Wenqiang,Chen, Xi,Luo, Geping,et al. Using the CENTURY model to assess the impact of land reclamation and management practices in oasis agriculture on the dynamics of soil organic carbon in the arid region of North-western China[J]. 中国科学院新疆生态与地理研究所,2011,8(1):30-37. |
APA | Xu, Wenqiang,Chen, Xi,Luo, Geping,&Lin, Qing.(2011).Using the CENTURY model to assess the impact of land reclamation and management practices in oasis agriculture on the dynamics of soil organic carbon in the arid region of North-western China.ECOLOGICAL COMPLEXITY,8(1),30-37. |
MLA | Xu, Wenqiang,et al."Using the CENTURY model to assess the impact of land reclamation and management practices in oasis agriculture on the dynamics of soil organic carbon in the arid region of North-western China".ECOLOGICAL COMPLEXITY 8.1(2011):30-37. |
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