Efficiency of KOH-modified rice straw-derived biochar for reducing cadmium mobility, bioaccessibility and bioavailability risk index in red soil

作     者：Saqib BASHIR Qaiser HUSSAIN Jun ZHU Qingling FU David HOUBEN Hongqing HU Saqib BASHIR;Qaiser HUSSAIN;Jun ZHU;Qingling FU;David HOUBEN;Hongqing HU

作者机构：Key Laboratory of Arable Land ConservationMiddle and Lower Reaches of Yangtse RiverMinistry of AgricultureCollege of Resources and EnvironmentHuazhong Agricultural UniversityWuhan 430070China Department of Soil and Environmental ScienceGhazi UniversityDera Ghazi Khan 32200Pakistan Department of Soil Science&SWCPMAS-Arid Agriculture UniversityRawalpindi 46300Pakistan AGHYLEUniLaSalleBeauvais 60011France 

出 版 物：《Pedosphere》 (土壤圈（英文版）)

年 卷 期：2020年第30卷第6期

页      面：874-898页

核心收录：

学科分类：12[管理学] 1204[管理学-公共管理] 082803[工学-农业生物环境与能源工程] 08[工学] 0828[工学-农业工程] 0818[工学-地质资源与地质工程] 0903[农学-农业资源与环境] 0901[农学-作物学] 120405[管理学-土地资源管理] 

基　　金：financially supported by the National Science and Technology Support Program of China(No.2015BAD05B02) 

主　　题：bioaccessible Cd Cd fractionation Cd immobilization NH4NO3-extractable Cd sequential extraction soilpH 

摘      要：Cadmium(Cd)pollution in agricultural soils has exerted a serious threat due to continuous application of pesticides,fertilizers,and wastewater *** present study aimed to test the efficiency of KOH-modified and non-modified rice straw-derived biochar(KBC and BC,respectively)for reducing Cd solubility and bioavailability in Cd-contaminated ***-contaminated soil was incubated for 60 d with 15 and 30 g kg-1 BC and *** the end of incubation,Cd mobility was estimated by the European Community Bureau of Reference sequential extraction and toxicity characteristic leaching procedure(TCLP),while bioavailability was determined using 1 molL-1 NH4NO3 *** bioavailability risk index and bioaccessibility,assessed by a simple bioaccessibility extraction test,of Cd were used to examine the potential effects of Cd on living *** results indicated that application of both KBC and BC significantly increased soil p H,cation exchange capacity,nutrients,and organic *** soluble fraction of Cd was significantly decreased by 30.3%and 27.4%,respectively,with the addition of KBC and BC at 30 g kg-1 compared to the control(without biochar addition).Similarly,the bioaccessible Cd was significantly decreased by 32.4%and 25.2%,respectively,with the addition of KBC and BC at 30 g kg-1 compared to the *** addition,both KBC and BC significantly reduced Cd leaching in the TCLP and NH4NO3-extractable Cd in the amended soil compared to the *** reduction in Cd solubility and bioaccessibility by KBC and BC may be due to significant increases in soil pH and surface ***,KBC at an application rate of 30 g kg-1 demonstrated positive results as soil amendment for Cd immobilization,and reduced bioaccessible Cd in contaminated soil.