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

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外文摘要：Different pore sizes present different pore shrinkage capacities in a nonrigid soil.However,the shrinkage capacities of different pore sizes and their influencing factors are not clear.We aimed to quantify the shrinkage capacities of different pore sizes(large pores,＞50 μm;medium pores,0.2-50 μm;fine pores,＜0.2 μm)and determine how soil properties impact soil shrinkage capacity at the regional scale.Two 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 at 0-20 cm depth in the Vertisol(locally known as Shajiang black soil)region of the North China Plain.The 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 transects.Large pores had higher pore shrinkage index(PSI)values(0.103-0.109)than medium(0.077-0.096)and fine(0.087-0.091)pores.The PSI of fine pores showed a fluctuating increasing trend from northwest to southeast,and the fine pore shrinkage capacity determined the COLE(r2=0.789.P＜0.001).The PSI of large pores had a significant relationship with soil bulk density(r=0.281,P＜0.05)and organic carbon(r=-0.311,P＜0.05),whereas those of medium and fine pores were correlated with soil clay content(r=0.381 and 0.687,respectively,P＜0.001).In addition,the PSI of fine pores was also correlated with montmorillonite content(r=0.387,P＜0.01).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 properties.The high variability in anthropogenic and pedogenic factors explains the spatial pattern of Vertisol shrinkage capacity on the North China Plain.

外文关键词：

clay contentcoefficient of linear extensibilitypore shrinkage indexsoil structurespatial distributionswelling

作者：

Yueming CHEN、Zhongbin ZHANG、Lei GAO、Zichun GUO、Peng XIONG、Fahui JIANG、Xinhua PENG

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作者单位：

State Key Laboratory of Soil and Sustainable Agriculture,Institute of Soil Science,Chinese Academy of Sciences,Nanjing 210008(China)

University of Chinese Academy of Sciences,Beijing 100049(China)

Jiangxi Agricultural University,Nanchang 330045(China)

基金：

National Natural science Foundation of ChinaNational Natural science Foundation of ChinaNational Key Research and Development Program of ChinaYouth Innovation Promotion Association,Chinese Academy Sciences

项目编号：

41930753417250042016YFD03008092021311

出版年：

2024

DOI：

10.1016/j.pedsph.2023.04.006

土壤圈(英文版)

中国土壤学会,中科院南京土壤研究所和土壤与农业可持续发展国家重点实验室

土壤圈(英文版)

CSTPCD

影响因子：0.477

ISSN：1002-0160

年,卷(期)：2024.34(3)