不同浓度螯合剂和浸提时间对土壤磷素提取效果研究  

Effect of Different Concentration and Extraction Time of Chelating Agents for the Soil Phosphorus Extraction in P-stabilized Soils

作　　者：王祺[1] 樊秉乾 张帅 张强 崔建宇[1] 陈清[1,3] WANG Qi;FAN Bingqian;ZHANG Shuai;ZHANG Qiang;CUI Jianyu;CHEN Qing(College of Resources and Environmental Sciences, China Agricultural University,Beijing 100193;Kingenta Ecological Engineering Group Co., Ltd., Linyi, Shandong 276700;National Key Laboratory of Nutrient Integrated Management, Linyi, Shandong 276700)

机构地区：[1]中国农业大学资源与环境学院,北京100193 [2]金正大生态工程集团股份有限公司,山东临沂276700 [3]养分资源开发与综合利用国家重点实验室,山东临沂276700

出　　处：《水土保持学报》2018年第6期302-308,共7页Journal of Soil and Water Conservation

基　　金：国家重点研发计划项目"京津冀设施农业面源和重金属污染防控技术示范"(2016YFD0801006)

摘　　要：为确定螯合剂活化土壤磷素的最佳浓度和最优浸提时间,参考水肥一体化技术,在室内浸提条件下,研究了不同浓度(0,0.05,0.1,0.25,0.5,1.0g/L)乙二胺四乙酸(EDTA)和柠檬酸螯合剂(pH=4)在不同浸提时间(1,12,24,48,72h)下对粮田、菜田土壤和有效磷被钝化后菜田土壤中磷素提取效果。结果表明:EDTA和柠檬酸在粮田土壤上对磷素提取中最佳条件为螯合剂浓度0.05g/L,浸提时间12h。EDTA和柠檬酸在菜田土壤、明矾钝化和混合钝化(明矾∶白云石为1∶1)菜田土壤上提取磷素的最佳条件为螯合剂浓度0.5g/L,浸提时间12h;而在白云石钝化土壤中则为螯合剂浓度0.5g/L,浸提时间1h。总体来看,柠檬酸的活化提取磷素效果优于EDTA,尤其是在采用明矾和白云石钝化的土壤上。In this study,the extracting experiment was conducted to investigate the effect of EDTA and citric acid(pH=4)on P mobilizationin in the grain field soil,greenhouse soil and P-stabilized greenhouse soils under different concentrations(0,0.05,0.1,0.25,0.5,1.0g/L)and different extraction times(1,12,24,48,72h),to make sure the optimal concentration and extraction time of chelating agent to extracts P from soils.The results indicated that the optimal concentration and extraction time were0.05g/L and12h for EDTA and citric acid in grain field soil.The optimal concentration and extraction time were0.5g/L and12h for EDTA and citric acid in green house soil,alum-stabilized soil and mixed-stabilized(alum∶dolomite was1∶1)soil.The optimal concentration and extraction time were0.5g/L and1h for EDTA and citric acid in dolomite-stabilized soil.Generally,the effect of citric acid was better than that of EDTA,especially in alum and dolomite stabilized soil.

关 键 词：螯合剂 钝化土壤 磷素活化 浸提时间 浸提浓度 

分 类 号：X53[环境科学与工程—环境工程]