Growing season water and salt migration between abandoned lands and adjacent croplands in arid and semi-arid irrigation areas in shallow water table environments
Growing season water and salt migration between abandoned lands and adjacent croplands in arid and semi-arid irrigation areas in shallow water table environments
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浅水位环境干旱半干旱灌区生长季撂荒地与邻近农田之间的水盐运移
DOI：
10.1016/j.agwat.2022.107968
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发表时间：
2022-12
影响因子：
6.7
通讯作者：
Jiarong Liu
中科院分区：
文献类型：
--
作者：
Geng Liu;Chaozi Wang;Xianghao Wang;Zailin Huo;Jiarong Liu
在干旱和半干旱灌区，地下水位较浅，农田和荒地排列分散，干排可以作为缓解土壤盐碱化的可选管理措施。干燥的排水系统使非灌溉的废弃土地成为蒸发盐汇，接收来自邻近灌溉农田的水和盐通量。因此，本研究以河套灌区典型旱涝单元——撂荒地及其邻近农田为例，直接揭示田间尺度的撂荒地和邻近农田之间的水盐运移。研究发现，在生长季节，水的输入，即田间灌溉和降水，提高了耕地的地下水位，并驱使水和盐从耕地迁移到撂荒地。但耕地的蒸散量也比荒地的蒸散量大。因此，在灌溉间隔期间（“潜水蒸发期”），在某些情况下，蒸散可能会导致水和盐从废弃土地流向农田，从而影响农田的地下水盐度。因此，建议在废弃地种植盐生植物，以增强其蒸散量，并在灌溉间隔期间阻碍水盐从废弃地向农田的通量。这种管理实践有助于在废弃土地和邻近农田之间形成更有效的干旱排水系统，并有助于更好地控制农田根区盐分。
In arid and semi-arid irrigation areas with shallow water tables and fragmented arrangement of croplands and abandoned lands, dry drainage could be an optional management practice mitigating soil salinization. A dry drainage system lets non-irrigated abandoned lands serve as evaporative salt sinks receiving water and salt fluxes from adjacent irrigated croplands. Therefore, this research takes a typical dry drainage unit in the Hetao Irrigation District—one abandoned land and its adjacent croplands—as an example to directly reveal the field scale water and salt migration between abandoned lands and adjacent croplands. It was found that during the growing season, the water input, i.e. field irrigation and precipitation, raised the water table of the croplands and drove water and salt migration from croplands to the abandoned lands. However, the evapotranspiration in the croplands was also larger than that in the abandoned lands. Thus, during the intervals of irrigation (the “phreatic evaporation periods”), in some circumstances, evapotranspiration could drive water and salt flux from the abandoned lands to the croplands, which would influence the groundwater salinity of the croplands. Therefore, it is recommended to plant halophytes on the abandoned lands to enhance its evapotranspiration and hinder the water and salt flux from the abandoned lands to the croplands during intervals of irrigation. This management practice could help form more effective dry drainage systems between abandoned lands and adjacent croplands, and help better control the root zone salinity of the croplands.
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影响因子：
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作者：
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DOI：
10.1061/9780784479162.200
发表时间：
2015-05
期刊：
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影响因子：
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作者：
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通讯作者：
D. Ahmad;S. Abbas;Liaghat Abdolmajid;D. A. Peyman
DOI：
10.1016/j.agwat.2010.08.025
发表时间：
2010-12
期刊：
Fuel and Energy Abstracts
影响因子：
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