Pore shrinkage capacity of Shajiang black soils(Vertisols)on the North China Plain and its influencing factors

作     者：Yueming CHEN Zhongbin ZHANG Lei GAO Zichun GUO Peng XIONG Fahui JIANG Xinhua PENG Yueming CHEN;Zhongbin ZHANG;Lei GAO;Zichun GUO;Peng XIONG;Fahui JIANG;Xinhua PENG

作者机构：State Key Laboratory of Soil and Sustainable AgricultureInstitute of Soil ScienceChinese Academy of SciencesNanjing 210008(China) University of Chinese Academy of SciencesBeijing 100049(China) Jiangxi Agricultural UniversityNanchang 330045(China) 

出 版 物：《Pedosphere》 (土壤圈（英文版）)

年 卷 期：2024年第34卷第3期

页      面：620-630页

核心收录：

学科分类：09[农学] 0903[农学-农业资源与环境] 090301[农学-土壤学] 

基　　金：supported by the National Natural Science Foundation of China(Nos.41930753 and 41725004) the National Key Research and Development Program of China(No.2016YFD0300809) the Youth Innovation Promotion Association,Chinese Academy Sciences(No.2021311) 

主　　题：clay content coefficient of linear extensibility pore shrinkage index soil structure spatial distribution swelling 

摘      要：Different pore sizes present different pore shrinkage capacities in a nonrigid ***,the shrinkage capacities of different pore sizes and their influencing factors are not *** aimed to quantify the shrinkage capacities of different pore sizes(large pores,50μm;medium pores,0.2-50μm;fine pores,0.2μm)and determine how soil properties impact soil shrinkage capacity at the regional *** sampling transects from west to east(360 km long,35 samples)and from north to south(190 km long,29 samples)were selected to investigate soil shrinkage capacity and physicochemical properties of at0-20 cm depth in the Vertisol(locally known as Shajiang black soil)region of the North China *** results showed that soil total shrinkage capacity,indicated by the coefficient of linear extensibility(COLE),had a mean value of 0.041-0.051 in the west-east and north-south *** pores had higher pore shrinkage index(PSI)values(0.103-0.109)than medium(0.077-0.096)and fine(0.087-0.091)*** PSI of fine pores showed a fluctuating increasing trend from northwest to southeast,and the fine pore shrinkage capacity determined the COLE(r^(2)=0.789,P0.001).The PSI of large pores had a significant relationship with soil bulk density(r=0.281,P0.05)and organic carbon(r=-0.311,P0.05),whereas those of medium and fine pores were correlated with soil clay content(r=0.381 and 0.687,respectively,P0.001).In addition,the PSI of fine pores was also correlated with montmorillonite content(r=0.387,P0.01).It can be concluded that the PSI of large pores is related to anthropogenically influenced soil properties with low stability,whereas those of medium and fine pores are related to pedogenic *** high variability in anthropogenic and pedogenic factors explains the spatial pattern of Vertisol shrinkage capacity on the North China Plain.