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当前位置: 首页 > 文章 > 冻融循环对农田黑土可溶性氮组分的调控效应 东北农业科学 2022,47 (1) 51-56+65
Position: Home > Articles > Regulation Effects of Freeze-Thaw Cycles on Soluble Nitrogen Components in Farmland Black Soil Journal of Northeast Agricultural Sciences 2022,47 (1) 51-56+65

冻融循环对农田黑土可溶性氮组分的调控效应

作  者：
隽英华;田路路;刘艳;孙文涛
单  位：
辽宁省农业科学院植物营养与环境资源研究所;常德市农业委员会
关键词：
冻融循环;农田黑土;可溶性无机氮;可溶性有机氮;可溶性全氮
摘  要：
为深入了解非生长季农田黑土氮素转化过程,采用室内冻融模拟培养试验研究不同冻融因子[冻融温度(冻结温度:-3、-6、-9、-12、-15℃;融化温度:2、5℃)、冻融循环次数(1、3、6、10、15;在-3℃冻结6 d、2℃融化1 d为1个冻融循环次数)、水分含量(10%、20%、30%)]对农田黑土可溶性氮组分含量的影响。结果表明,较大的冻融温差(-15～-12℃/2～5℃)、适宜的冻融循环次数(1～3)和水分含量(20%～30%)是影响农田黑土可溶性氮组分含量的主要驱动因子。随着冻结温度降低,冻融土壤可溶性无机氮(DIN,NH_4~+-N+NO_3~--N)和可溶性全氮(DTN)含量均显著增加,以-15℃冻结时最大分别为89.84、101.99 mg/kg,而可溶性有机氮(DON)含量的变化行为受融化温度的协同影响。随着融化温度升高,冻融土壤DIN、DON和DTN含量均无显著性变化。随着冻融循环次数增加,冻融土壤DIN含量显著降低,以循环次数15时最小(83.21 mg/kg),而DON和DTN含量均先升高后降低,分别在循环次数6和3时达到最大值。随着水分含量增加,冻融土壤DON和DTN含量均显著增加,以水分含量30%时最大,分别为20.57、107.62 mg/kg,而DIN含量无显著性变化。可见冻融作用显著促进非生长季农田黑土氮素转化,有利于土壤有效氮的累积。
译  名：
Regulation Effects of Freeze-Thaw Cycles on Soluble Nitrogen Components in Farmland Black Soil
作  者：
JUAN Yinghua;TIAN Lulu;LIU Yan;SUN Wentao;Institute of Plant Nutrition and Environmental Resources, Liaoning Academy of Agricultural Sciences;Changde City Agriculture Committee;
关键词：
Freezing-thawing cycles;;Farmland black soil;;Dissolved inorganic nitrogen;;Dissolved organic nitrogen;;Dissolved total nitrogen
摘  要：
In order to understand the nitrogen transformation process of non-growing season farmland black soil,theeffects of different freezing and thawing factors on the content of soluble nitrogen components in farmland black soilwere studied by indoor freezing and thawing simulated culture experiment.The results showed that the main drivingfactors affecting the content of soluble nitrogen in farmland black soil were large temperature difference of freezingand thawing,appropriate number of freezing and thawing cycles (1-3) and water content (20%-30%).With the de-crease of freezing temperature,the contents of soluble inorganic nitrogen (DIN,NH_4~+-N+NO_3~--N) and soluble totalnitrogen (DTN) in freezing-thawing soil increased significantly,and the highest values were 89.84,101.99 mg/kg,re-spectively,at-15℃.The content of soluble organic nitrogen (DON) was synergistically affected by melting tempera-ture.With the increase of thawing temperature,the contents of DIN,DON and DTN in freezing-thawing soil did notchange significantly.DIN content in freezing-thawing soil decreased significantly with the number of freezing-thawing cycles increasing,and reached the minimum (83.21 mg/kg) when the number of freezing-thawing cycles in-creased 15,while DON and DTN contents increased first and then decreased,and reached the maximum value whenthe number of freezing-thawing cycles increased 6 and 3,respectively.With the increase of water content,the con-tents of DON and DTN in freezing-thawing soil increased significantly,and the highest values were 20.57 and107.62 mg/kg,respectively,when the water content was 30%,while DIN content had no significant change.In con-clusion,freezing-thawing significantly promoted nitrogen conversion in non-growing season farmland black soil,and was beneficial to soil available nitrogen accumulation.

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