Combined application of a straw layer and flue gas desulphurization gypsum to reduce soil salinity and alkalinity  

作　　者：Yonggan ZHAO Yan LI Shujuan WANG Jing WANG Lizhen XU 

机构地区：[1]Beijing Engineering Research Center for Ecological Restoration and Carbon Fixation of Saline-Alkaline and Desert Land,Department of Thermal Engineering,Tsinghua University,Beijing 100084,China [2]Institute of Agricultural Resources and Regional Planning,Chinese Academy of Agricultural Sciences,Beijing 100081,China

出　　处：《Pedosphere》2020年第2期226-235,共10页土壤圈（英文版）

基　　金：supported by the Chinese Postdoctoral Science Foundation(No.2015M580110);the National Key Research and Development Program of China(No.2016YFC0501306)。

摘　　要：Burying a straw layer and applying flue gas desulphurization(FGD)gypsum are effective practices to ameliorate soil salinization or alkalization and to increase crop yield;however,little information exists on the effects of such integration in saline-alkali soils.A soil column experiment was conducted to investigate the effects of a straw layer plus FGD gypsum on soil salinity and alkalinity.We placed a straw layer(5 cm thick)at a depth of 30 cm and mixed FGD gypsum into the 0–20 cm soil layer at application rates of 7.5,15.0,22.5,and 30.0 t ha^-1,with no straw layer and FGD gypsum as a control(CK).The soil water content in the 0–30 cm soil layer was significantly higher(>7.8%)in the treated soil profiles after infiltration than in the CK,but decreased after evaporation.The electrical conductivity(EC)of the 10–30 cm soil layer was 230.2%and 104.9%higher in the treated soil profiles than in the CK after infiltration and evaporation,respectively,and increased with increasing rates of FGD gypsum application,with Ca^2+and SO4^2-being the main dissolved salts.Compared to those in the CK,the concentrations of Na^+,Cl^-,and HCO3-decreased in the treated soil profiles at depths above 55 cm,but the other soluble ions increased,after infiltration.A similar trend occurred after evaporation for all soluble ions except for HCO3-.The p H and exchangeable sodium percentage in the treated soil profiles were significantly lower than those in the CK over the entire profile,and decreased with increasing FGD gypsum application rates.Therefore,the incorporation of a straw layer plus FGD gypsum can reduce salinity and alkalinity,but the quantity of FGD gypsum should be controlled in saline-alkali soils.

关 键 词：alkaline SOIL SALINE-ALKALI stress SALINE SOIL salt accumulation secondary SALINIZATION SOIL AMELIORATION SOIL reclamation 

分 类 号：S156.4[农业科学—土壤学]