论文
论文标题: Converting alfalfa pasture into annual cropland achieved high productivity and kept soil organic carbon in a semiarid area
作者: Zhang, Xu-Long; Zhao, Yang-Yang; Gao, Wen-Juan; Song, Xin; Zhang, Xin-Tan; Shi, Xiao-Yan; Li, Feng-Min
出版刊物: LAND DEGRADATION & DEVELOPMENT
出版日期:
出版年份: 2020
卷/期:
DOI: 10.1002/ldr.3808
论文摘要: Converting alfalfa (Medicago sativa L.) into annual cropland (rotated cropland, RC) is commonly done to reuse degraded alfalfa pasture. However, it is a big challenge for RC to achieve high productivity and maintain high soil organic carbon (SOC) to the levels achieved by previous alfalfa pasture. We converted a long-term alfalfa pasture into RC in 2010, and studied the effects of fertilization on soil moisture, crop productivity, and SOC in the RC and in continuous cropland (CC), both under plastic film mulching, from 2010 to 2018. Before the conversion, alfalfa pasture had a higher SOC (12.3%) and total N (7.7%) than CC. However, not only severe soil desiccation occurred, but the available P and inorganic-N were only about 39.4 and 25.1% of levels for CC. After the conversion, soil moisture in RC (measured at 0-0.6 m depth) was up to CC levels only after 1 year, and was restored to 95.3 and 69.2% of CC levels at 0.6-2 and 2-5 m depths only after 9 years. Crop yield and biomass in RCF (RC with fertilization) were comparable to those for CCF (CC with fertilization) after two years from conversion due to the increased available P and inorganic-N, and sufficient soil moisture restoration at 0-0.6 m depath. SOC in RC decreased by 8.1% over the 9 years, while RCF consistently kept SOC levels up to those of pre-conversion alfalfa pasture. These findings help to eliminate concerns about the continuously low production and rapid decline of SOC in croplands converted from alfalfa and suggest ways to support sustainable high-productivity and high SOC sequestration in dryland farming.
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  • 水产品种创制与高效养殖全国重点实验室
  • 中国科学院藻类生物学重点实验室
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  • 湖北省海洋湖沼学会
  • 中国动物学会原生动物学分会
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  • 中国鱼类学会
== 平台建设 ==
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  • “一带一路”海域赤潮数据库
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  • 国家斑马鱼资源中心
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  • 中国科学院水生生物研究所分析测试中心
  • 中国科学院超级计算武汉分中心
  • 水生生物博物馆
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