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
朱帅 1李仕勇 1姜泊宇 1赵文熠 1赵茂杰 1陈一民 2隋跃宇 2焦晓光1
作者信息
- 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
- 折叠
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.
Abstract
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Key words
freeze-thaw cycles/soil aggregates/aggregates stability/aggregates bound organic carbon/freeze-thaw action/organic carbon/soil physicochemical properties/soil management/ecosystem restoration引用本文复制引用
基金项目
国家自然科学基金面上项目(42077081)
科技基础资源调查专项(2021FY100400)
国家重点研发计划(2023YFD1500105)
出版年
2024
国家科技期刊平台
NSTL
万方数据