干旱地区农业研究2017，Vol.35Issue(4)：10-14,38,6.DOI:10.7606/j.issn.1000-7601.2017.04.02
外源铅在土壤中的年际变化及对土壤有机碳矿化和速效养分的影响
Annual variability of exogenous lead in the soil and its effect on soil organic carbon mineralization and available nutrients
摘要
Abstract
In order to evaluate the response of loess soil to medium-low concentration lead and provide reasonable basis for early warning and controlling of lead pollution,we studied the annual changes of exogenous lead under field condition and the effect of lead pollution on soil organic carbon mineralization and soil available nutrients.Exogenous lead was added into the top layer of the loess soil,the wheat-corn rotation test began in the autumn of 2010.In the wheat season of 2011--2013,the top layer soil (0～ 20 cm) was collected for analysis of total lead,available lead,soil organic carbon (SOC),dissolubility organic carbon (DOC),microbial biomass carbon (MBC),available N、P and K.The resuhs showed that the total lead and available lead was decreased by 13.22％ and 30.65％,respectively in thrme years,and it had a tendency to decrease by years Compared with the control (CK),Pb pollution was decreased SOC by 16.30％ and 11.86％ and DOC by 4.05％ and 7.34％,in Pb1 and Pb2 levels,respectively,and showed significant negative correlation with soil lead levels.The content of soil microbial quotient (qM) were increased,and there was no significant differences in soil microbial biomass carbon.In addition,the soil available nitrogen content showed a dramaticdecline after the exogenous lead addition,with the largest reduction for Pb1.The content of soil available phosphorus was decreased with the increase of soil lead,while the soil available potassium was increased.The study showed that the accumulation and stability of soil organic carbon pool was affected by heavy metal contamination,thus affecting the soil carbon and nitrogen cycling.Lead ions would react with phosphate ions to form indissoluble salts,and the K+ in soil colloids and mineral lattice can be replaced by lead ions,which could pose risk of loss of available nutrients.关键词
外源铅/有机碳/微生物量碳/速效养分Key words
exogenous lead/soil organic carbon/microbial biomass carbon/soil available nutrients分类
农业科技引用本文复制引用
刁展,吕家珑,安凤秋..外源铅在土壤中的年际变化及对土壤有机碳矿化和速效养分的影响[J].干旱地区农业研究,2017,35(4):10-14,38,6.基金项目
公益性行业(农业)科研专项“主要农产品产地土壤重金属污染阈值研究与防控技术集成示范”(200903015) （农业）
