摘要
土壤水盐条件变化会影响土壤水稳性团聚体的结构和稳定性。综述了不同水盐条件下湿地土壤水稳性团聚体结构和稳定性,水淹环境可以提高较小粒径水稳性团聚体的含量,阻碍大团聚体的形成;盐离子通过干扰土壤颗粒间的静电力影响团聚体的形成与稳定,其影响效应与离子种类和数量有关,Na^(+)和K^(+)等单价阳离子和专性吸附作用的阴离子易破坏团聚体;Ca^(2+)和Mg^(2+)等多价阳离子会降低腐殖质与黏粒间的静电斥力,利于土壤水稳性团聚体的形成;当离子含量超过一定范围时,电荷量增大带来的团聚效果将减弱,离子性质对团聚体的分散作用凸显;今后可以进一步开展土壤孔隙结构变化与有机碳矿化速率的关系、有机胶结物质的官能团结合效率、团聚体内部各碳库组分间的转变速率等方面的研究。
Changes of soil salinity and flooding degree affect the composition and stability of soil water-stable aggregates.This paper summarizes the effects of soil moisture and salinity condition changes on the distribution and stability of soil water-stable aggregates.Flooding environment increases the distribution proportion of smaller particle size soil water-stable aggregates and hinders the formation of large ones.Salt ions affect the formation and stability of aggregates by interfering the electrostatic force between soil particles,whose effect is related to the type and quantity of ions.Monovalent cations(e.g.Na^(+),K^(+))and anions with specific adsorption tend to destroy aggregates,and multivalent cations(e.g.Ca^(2+),Mg^(2+))are beneficial to the formation of soil water-stable aggregates by reducing the electrostatic repulsion between humus and clay.When the amount of ions exceeds a certain range,the agglomeration effect caused by the increase of charge is weakened,while the dispersion effect of ion properties on aggregates is prominent.Given the importance of studies on carbon sequestration in wetland ecosystem,the research on the specific characterization and contribution of synergistic change factors to the formation and stability of aggregates,the mechanism of soil cementitious substances and its relationship with the moisture and salinity changes,and the research on the dynamic changes of aggregates with the help of isotope tracing and electronic computed tomography are recommended.
作者
廖抒蔚
孔维凤
梁嫦娥
王腊梅
李坤桐
王纯
仝川
LIAO Shuwei;KONG Weifeng;LIANG Change;WANG Lamei;LI Kuntong;WANG Chun;TONG Chuan(Fujian Province Key Laboratory of Subtropical Resources and Environment,Fuzhou 350007,Fujian,P.R.China;College of Geographical Sciences,Fujian Normal University,Fuzhou 350007,Fujian,P.R.China)
出处
《湿地科学》
CSCD
北大核心
2021年第5期623-628,共6页
Wetland Science
基金
国家自然科学基金项目(41901111)
福建省自然科学基金项目(2020J01188)
福建师范大学2020年大学生创新训练计划项目(S202010394032)资助。
关键词
土壤水稳性团聚体
结构
稳定性
水盐条件
soil water-stable aggregates
composition
stability
moistures and salinities
