冻融循环作用对东北农田黑土团聚体及有机碳的影响  

Effect of Freeze-thaw Cycles on Distribution of Soil Aggregates and Their Organic Carbon Content in Arable Mollisol

作　　者：朱帅 李仕勇 姜泊宇 赵文熠 赵茂杰 陈一民[2] 隋跃宇[2] 焦晓光[1] ZHU Shuai;LI Shiyong;JIANG Boyu;ZHAO Wenyi;ZHAO Maojie;CHEN Yimin;SUI Yueyu;JIAO Xiaoguang(College of Modern Agriculture and Ecological Environment,Heilongjiang University,Harbin 150080;Northeast Institute of Geography and Agroecology,Chinese Academy of Sciences,University of Chinese Academy of Sciences,Harbin 150081)

机构地区：[1]黑龙江大学现代农业与生态环境学院,哈尔滨150080 [2]中国科学院东北地理与农业生态研究所,中国科学院大学,哈尔滨150081

出　　处：《中国农学通报》2024年第23期53-59,共7页Chinese Agricultural Science Bulletin

基　　金：国家自然科学基金面上项目“冻融作用下秸秆还田后氮转化对农田黑土氮库更新机制的研究”(42077081);科技基础资源调查专项“中国东北黑土区农田土壤资源与健康状况调查”(2021FY100400);国家重点研发计划“黑土典型区土壤资源保护利用技术精准配置与示范”(2023YFD1500105)。

摘　　要：为研究冻融循环作用对东北农田黑土土壤团聚体及结合碳的影响,本研究以黑龙江省海伦市农田黑土为研究对象,利用室内培养试验研究了-9、-18、-26℃3个温度下冻融频次对农田黑土团聚体及有机碳含量的影响。结果表明:随着冻融循环次数的增加,1~0.5 mm和0.25~0.053 mm团聚体含量在3种冻融温度下均发生了显著变化(P<0.05)。与冻融循环1次相比,在相同温度下冻融循环17次后1~0.5 mm团聚体含量在-9、-18、-26℃下分别降低了68.53%、10.91%和40.96%,0.25~0.053 mm团聚体含量分别升高了10.93%、40.89%和99.72%。在-9℃下土壤团聚体分形维数显著升高(P<0.05),由2.09增加到2.74,在-18、-26℃下则变化幅度较小,分别变化了0.1和0.05。土壤团聚体结合碳随着冻融频次的增加没有出现显著的变化(P>0.05),在-18℃和-26℃下,<0.053 mm团聚体有逐渐降低的趋势,在冻融循环17次后分别降低了10.31%和13.73%。冻融作用会显著降低东北农田黑土土壤团聚体的稳定性,冻融作用会显著降低1~0.5 mm团聚体含量并提高0.25~0.053 mm团聚体含量(P<0.05);冻融次数和冻融温度均是影响土壤团聚体稳定性的重要因素。To investigate the impact of freeze-thaw cycles on soil aggregates and bound carbon in arable mollisol,this study took arable mollisol in Hailun,Heilongjiang Province as the research object.Incubation experiments were conducted to investigate the impact of freeze-thaw frequency on soil aggregates and organic carbon content of arable mollisol at three temperatures:-9,-18 and-26℃.The results indicated that the content of 1-0.5 mm and 0.25-0.053 mm aggregates exhibited significant changes at all three freeze-thaw temperatures with an increase of freeze-thaw frequencies(P<0.05).Compared with single freeze-thaw cycle,after 17 freeze-thaw cycles at the same temperature,the content of 1-0.5 mm aggregates decreased by 68.53%,10.91%and 40.96%at-9,-18 and-26℃,respectively.The content of 0.25-0.053 mm aggregates increased by 10.93%,40.89%and 99.72%,respectively.At-9℃,the fractal dimension of soil aggregates significantly increased(P<0.05)from 2.09 to 2.74,while at-18℃and-26℃,the changes were small,with changes of 0.1 and 0.05,respectively.The bound carbon of soil aggregates did not show significant changes with the increase of freeze-thaw frequency(P>0.05).At-18℃and-26℃,the<0.053 mm aggregate showed a gradual decreasing trend,with a decrease of 10.31%and 13.73%after 17 freeze-thaw cycles,respectively.The freeze thaw impact could significantly reduce the stability of soil aggregates in arable mollisol.The increasing freeze thaw cycles can significantly reduce the content of aggregates by 1-0.5 mm and increase the content of aggregates by 0.25-0.053 mm(P<0.05).Both freeze-thaw frequency and temperature were important factors affecting the stability of soil aggregates.

关 键 词：冻融循环 土壤团聚体 团聚体稳定性 团聚体有机碳 冻融作用 有机碳 土壤理化性质 土壤管理 生态系统恢复 

分 类 号：S153.6[农业科学—土壤学]