论文题目: Impacts of varying agricultural intensification on crop yield and groundwater resources: comparison of the North China Plain and the US High Plains
论文编号:
作者: Pei, H.(裴宏伟), Scanlon, B., Shen, Y.(沈彦俊), Reedy, R.C., Long, D., Liu, C.(刘昌明)
刊物名称: Environmental Research Letters
卷期页码: 10, (2015), 044013
发表年度: 2015
DOI: http://dx.doi.org/10.1088/1748-9326/10/4/044013
摘要: Agricultural intensification is often considered the primary approach to meet rising food demand. Here we compare impacts of intensive cultivation on crop yield in the North China Plain (NCP) with less intensive cultivation in the US High Plains (USHP) and associated effects on water resources using spatial datasets. Average crop yield during the past decade from intensive double cropping of wheat and corn in theNCP was only 15% higher than the yield from less intensive single cropping of corn in the USHP, although nitrogen fertilizer application and percent of cropland that was irrigated were both~2 times greater in theNCP than in the USHP. Irrigation and fertilization in both regions have depleted groundwater storage and resulted in widespread groundwater nitrate contamination. The limited response to intensive management in the NCPis attributed in part to the two month shorter growing season for corn to accommodate winter wheat than that for corn in the USHP. Previous field and modeling studies of crop yield in theNCP highlight over application ofNand water resulting in low nitrogen and water use efficiencies and indicate that cultivars, plant densities, soil fertility and other factors had a much greater impact on crop yields over the past few decades. TheNCP–USHP comparison along with previous field and modeling studies underscores the need to weigh the yield returns from intensive management relative to the negative impacts on water resources. Future crop management should consider the many factors that contribute to yield along with optimal fertilization and irrigation to further increase crop yields while reducing adverse impacts on water resources.
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Impacts of varying agricultural intensification on crop yield and groundwater resources: comparison
农业资源研究中心 辅仁网/2017-07-23
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