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首页> 外文期刊>Soil Biology & Biochemistry >Response of soil constituents to freeze-thaw cycles in wetland soil solution
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Response of soil constituents to freeze-thaw cycles in wetland soil solution

机译：湿地土壤溶液中土壤成分对冻融循环的响应

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Soil freeze-thaw cycles in the winter-cold zone can substantially affect soil carbon, nitrogen and phosphorus cycling, and deserve special consideration in wetlands of cold climates. Semi-disturbed soil columns from three natural wetlands (Carex marsh, Carex marshy meadow and Calamagrostis wet grassland) and a soybean field that has been reclaimed from a wetland were exposed to seven freeze-thaw cycles. The freeze-thaw treatments were performed by incubating the soil columns at -10 掳C for 1 d and at 5 掳C for 7 d. The control columns were incubated at 5 掳C for 8 d. After each freeze-thaw cycle, the soil solution was extracted by a solution extractor installed in each soil layer of the soil column, and was analyzed for dissolved organic carbon (DOC), NH sub(4[super]+-N, NO) sub(3)[super]--N and total dissolved phosphorus (TDP). The results showed that freeze-thaw cycles could increase DOC, NH sub(4[super]+-N and NO) sub(3)[super]--N concentrations in soil solutions, and decrease TDP concentrations. Moreover, the changes of DOC, NH sub(4[super]+-N, NO) sub(3)[super]--N and TDP concentrations in soil solutions caused by freeze-thaw cycles were different in various sampling sites and soil layers. The increments of DOC concentrations caused by freeze-thaw cycles were greater in the wetland soil columns than in the soybean field soil columns. The increments of NH sub(4[super]+-N concentrations caused by freeze-thaw cycles decreased with the increase of soil depth. The depth variation in the increments of NO) sub(3)[super]--N concentrations caused by freeze-thaw cycles in the wetland soil columns was different from that in the soybean field soil columns. The decrements of TDP concentrations caused by freeze-thaw cycles were greater in columns of Carex marsh and Carex marshy meadow than in columns of Calamagrostis wet grassland and the soybean field. The study results provide information on the timing of nutrient release related to freezing and thawing in natural versus agronomic soils, and have implications for the timing of nutrient application in farm fields in relation to water quality protection.
机译：冬季寒冷地区的土壤冻融循环会严重影响土壤的碳，氮和磷循环，因此在寒冷气候的湿地中应特别考虑。将来自三个自然湿地（Carex沼泽，Carex沼泽草地和Calamagrostis湿草原）的半扰动土壤柱和从湿地开垦的大豆田进行七个冻融循环。冻融处理是通过将土壤柱在-10掳C下孵育1 d和在5掳C下孵育7 d进行的。将对照柱在5°C下孵育8 d。在每个冻融循环之后，通过安装在土壤柱各土壤层中的溶液提取器提取土壤溶液，并分析其溶解有机碳（DOC），NH sub（4 ^ +-N，NO） sub（3）-N和总溶解磷（TDP）。结果表明，冻融循环可以增加土壤溶液中DOC，NH sub（4 ^ +-N和NO）sub（3）super-N的浓度，并降低TDP的浓度。此外，在不同的采样点和土壤中，冻融循环引起的土壤溶液中DOC，NH sub（4 ^ +-N，NO）sub（3）super-N和TDP浓度的变化是不同的。层。冻融循环引起的DOC浓度增量在湿地土壤柱中比在大豆田土柱中更大。冻融循环引起的NH sub（4 ^ +-N）浓度的增加量随土壤深度的增加而减小，NO（sub）（3）super-N浓度的增加量的深度变化是由土壤融化引起的。湿地土壤柱的冻融循环与大豆田土壤柱的冻融循环不同。冻融循环导致的TDP浓度下降在Carex沼泽和Carex沼泽草地的柱中比在Calamagrostis湿草原和大豆田的柱中更大。研究结果提供了与自然土壤和农艺土壤中与冻结和解冻有关的养分释放时间的信息，并且对与水质保护相关的农田养分施用的时间产生了影响。

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