冻融作用对农田土壤可溶性氮组分的影响
发布时间：2018-07-31 15:50
【摘要】：为了解非生长季农田土壤氮素转化过程,采用室内冻融模拟培养试验研究了不同冻融温度和冻融循环次数对东北4种典型农田土壤(棕壤、褐土、草甸土、黑土)可溶性氮组分含量的影响。结果表明:随着冻结温度降低,4种农田土壤可溶性无机氮(DIN,NO_3~ -N+NH_4~+-N)、可溶性有机氮(DON)和可溶性全氮(DTN)含量均显著增加。随着融化温度升高,除NH_4~+-N含量显著升高外,4种农田土壤NO_3~ -N、DON和DTN含量的变化行为受冻结温度和土壤类型的协同影响。随着冻融循环次数增加,棕壤和褐土NO_3~ -N、NH_4~+-N、DON和DTN含量均显著增加;草甸土NO_3~ -N、DON和DTN含量均显著增加,而NH_4~+-N含量显著降低;黑土NO_3~ -N和NH_4~+-N含量均显著降低,而DON和DTN含量则先升高后降低。不同类型土壤受冻融作用影响的响应能力不同,其大小顺序为褐土棕壤、草甸土黑土。可见,冻融作用促进了土壤氮素转化,有利于土壤有效氮的累积,为春季作物生长提供足够的氮素,但同时也增加了土壤氮素流失风险。
[Abstract]:In order to understand the process of nitrogen transformation in non-growing season farmland soil, four typical farmland soils (brown soil, cinnamon soil, meadow soil) were studied by using indoor freezing and thawing simulation culture experiments with different freezing and thawing temperatures and times of freeze-thaw cycles. The effect of soluble nitrogen content in black soil. The results showed that the contents of soluble organic nitrogen (DON) and soluble total nitrogen (DTN) increased significantly with the decrease of freezing temperature. With the increase of melting temperature, the variation behavior of NO3- N- don and DTN contents in four kinds of farmland soils except NH4- N was influenced by the synergistic effect of freezing temperature and soil type. With the increase of freeze-thaw cycles, the contents of no _ 3 ~ -N _ 4 ~ -N _ n and DTN in brown soil and cinnamon soil increased significantly, the contents of no _ 3 ~ -N _ (-N) and DTN in meadow soil increased significantly, while the content of NH _ 4 ~ -N decreased significantly, and the contents of no _ 3 ~ -N and NH _ 4 ~ -N decreased significantly in black soil, and the contents of no _ 3 ~ -N and NH _ 4 ~ -N decreased significantly in brown soil and cinnamon soil. The contents of DON and DTN increased first and then decreased. The response ability of different types of soils affected by freezing and thawing was different. The order of their size was brown soil of cinnamon soil and black soil of meadow soil. It can be seen that freezing and thawing promoted soil nitrogen conversion, which was beneficial to the accumulation of soil available nitrogen, and provided sufficient nitrogen for crop growth in spring, but also increased the risk of soil nitrogen loss.
【作者单位】： 沈阳农业大学土地与环境学院;辽宁省农业科学院植物营养与环境资源研究所;冠县农业局;
【基金】：国家自然科学基金项目(41301253) 辽宁省农业领域青年科技创新人才培养计划项目(2014018) 公益性行业(农业)科研专项(201503118-08) 国家科技支撑计划项目(2013BAD05B07)资助
【分类号】：S153.6
[Abstract]:In order to understand the process of nitrogen transformation in non-growing season farmland soil, four typical farmland soils (brown soil, cinnamon soil, meadow soil) were studied by using indoor freezing and thawing simulation culture experiments with different freezing and thawing temperatures and times of freeze-thaw cycles. The effect of soluble nitrogen content in black soil. The results showed that the contents of soluble organic nitrogen (DON) and soluble total nitrogen (DTN) increased significantly with the decrease of freezing temperature. With the increase of melting temperature, the variation behavior of NO3- N- don and DTN contents in four kinds of farmland soils except NH4- N was influenced by the synergistic effect of freezing temperature and soil type. With the increase of freeze-thaw cycles, the contents of no _ 3 ~ -N _ 4 ~ -N _ n and DTN in brown soil and cinnamon soil increased significantly, the contents of no _ 3 ~ -N _ (-N) and DTN in meadow soil increased significantly, while the content of NH _ 4 ~ -N decreased significantly, and the contents of no _ 3 ~ -N and NH _ 4 ~ -N decreased significantly in black soil, and the contents of no _ 3 ~ -N and NH _ 4 ~ -N decreased significantly in brown soil and cinnamon soil. The contents of DON and DTN increased first and then decreased. The response ability of different types of soils affected by freezing and thawing was different. The order of their size was brown soil of cinnamon soil and black soil of meadow soil. It can be seen that freezing and thawing promoted soil nitrogen conversion, which was beneficial to the accumulation of soil available nitrogen, and provided sufficient nitrogen for crop growth in spring, but also increased the risk of soil nitrogen loss.
【作者单位】： 沈阳农业大学土地与环境学院;辽宁省农业科学院植物营养与环境资源研究所;冠县农业局;
【基金】：国家自然科学基金项目(41301253) 辽宁省农业领域青年科技创新人才培养计划项目(2014018) 公益性行业(农业)科研专项(201503118-08) 国家科技支撑计划项目(2013BAD05B07)资助
【分类号】：S153.6
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