模拟冻融循环作用对不同作物耕地土壤硝态氮含量影响研究  

Study on Effect of Simulated Freeze-thaw Cycles on Soil Nitrate Nitrogen Content in Different Cropland

作　　者：袁晓阳 陈末 王千凤 刘袁媛 Yuan Xiaoyang;Chen Mo;Wang Qianfeng;Liu Yuanyuan(Water Conservancy&Electric Power Institute Heilongjiang University,Harbin 150080,China;Cold Regional Groundwater Research Institute Heilongjiang University,Harbin 150080,China)

机构地区：[1]黑龙江大学水利电力学院,哈尔滨150080 [2]黑龙江大学寒区地下水研究所,哈尔滨150080

出　　处：《黑龙江水利科技》2025年第3期98-103,共6页Heilongjiang Hydraulic Science and Technology

摘　　要：以哈尔滨市双城区水稻与玉米种植地土壤为研究对象,文章采用室内模拟冻融循环试验方法探究了不同含水率(10%、20%、30%、40%)、冻结时间(冻结12h-融化12h、冻结24h-融化24h)、冻融温度(-20~10℃、-10~10℃)下中硝态氮含量对冻融循环作用的响应。试验结果表明:①不同冻融条件下,两种土壤类型的硝态氮含量均有显著变化,水稻种植地土壤中硝态氮含量高于玉米种植地土壤硝态氮含量;②在模拟冻融循环试验中,两种类型种植地土壤硝态氮含量均随着含水率的增加呈上升再下降的变化趋势;长周期冻融土壤硝态氮含量变化幅度较短周期冻融变化幅度略大;③水稻土壤在轻度冻结时硝态氮含量最大值与未冻融时的增长倍数要高于重度冻结;而玉米土壤表现则相反。Taking the soil of rice and corn planting in Shuangcheng District of Harbin City as the researched object,a simulated freeze-thaw cycle test method was used to investigate the response of nitrate nitrogen content to freeze-thaw cycle under different water content(10%,20%,30%,40%),freezing time(freezing12h-thawing 12h,freezing 24h-thawing 24h)and freeze-thaw temperature(-20~10℃,-10~10℃).The experimental results showed that:①Under different freeze-thaw conditions,the nitrate nitrogen content of the two soil types had significant changes,and the nitrate nitrogen content of the soil in the rice planting field was higher than that in the corn planting field;②In the simulated freeze-thaw cycle test,the soil nitrate nitrogen content of the two types of planting plots increased and then decreased with the increase of water content,and the variation range of nitrate content in long-period freeze-thaw soil is slightly larger than that in short-period freeze-thaw soil;③The maximum content of nitrate nitrogen in rice soil under mild freezing and non-freezing thawing were higher than those under heavy freezing,however,the maize soil showed the opposite behavior.

关 键 词：冻融循环 硝态氮 氮素 

分 类 号：TU448[建筑科学—岩土工程]