冻融作用对辽东山地古冰缘地貌不同植被类型土壤无机氮的影响  

作　　者：韩青 范志平[1] 白洁[2] 陈寒 李一凡 

机构地区：[1]辽宁石油化工大学环境与安全工程学院,辽宁抚顺113001 [2]辽宁大学环境学院,辽宁沈阳110011

出　　处：《环境保护与循环经济》2022年第11期46-49,80,共5页environmental protection and circular economy

基　　金：国家自然科学基金面上项目(41977074,41877154);辽宁省科学技术计划项目(2021JH2/10300005)。

摘　　要：冻融作用改变了冰缘地貌季节性冻土区土壤结构和水热运动规律,进而作用于土壤氮素生物地球化学循环过程。以辽东山地古冰缘地貌不同植被类型土壤为研究对象,分析了冻融作用对土壤主要理化指标动态变化的影响。结果表明,土壤含水量在冻融影响下由39.14%~67.86%升至62.90%~128.15%,土壤pH和土壤电导率受冻融作用的影响其变化有所不同,冻融作用对不同植被类型土壤有机质和全氮含量影响较小,土壤无机氮含量在冻融初期为34.37~68.38 mg/kg,冻融末期为8.25~20.73 mg/kg,可见冻融作用显著影响了土壤无机氮的动态变化,为流域地表水环境质量动态变化提供了依据。Freezing-thawing cycle controls the change of soil structure,surface hydrothermal factors and soil nitrogen biogeochemical cycle in periglacial geomorphic region. Taken soil under different vegetation types in periglactic geomorphology of the eastern Liaoning mountainous regions as study object,the effects of freezing and thawing on the dynamic changes of main physical and chemical indexes of soil were analyzed in the study. The results showed that,the soil moisture content increased significantly from 39.14%-67.86% to 62.90%-128.15% and the p H value and conductivity of soil were different under the influence of freezing and thawing. It had no significant effect on soil organic matter content and soil total nitrogen content. Soil inorganic nitrogen content in different vegetation types decreased significantly from 34.37-68.38 mg/kg at the beginning of freezing and thawing,to 8.25-20.73 mg/kg at the end of freezing and thawing. The results indicate that freezing and thawing effects significantly affect soil inorganic nitrogen,which provide scientific basis for dynamic changes of water environmental quality in watershed.

关 键 词：冻融作用 植被类型 无机氮 动态变化 

分 类 号：X53[环境科学与工程—环境工程]