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《镉污染稻草还田对土壤镉形态转化的影响-论文.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、2013,32(9):1786—1792农环境科学学报2013年9月Journalagro-EnvironmentScience镉污染稻草还田对土壤镉形态转化的影响曹晓玲,一,罗尊长,黄道友,朱奇宏,刘守龙,饶中秀,任雪菲,席园1(1冲国科学院亚热带农业生态研究所,亚热带农业生态过程重点实验室,长沙410125;2.湖南省土壤肥料研究所,长沙410125)摘要:采用模拟培养实验,研究了镉污染稻草还田后清洁土壤(pH=4.72)和镉污染土壤(pH=7.90)中有效态镉含量及镉形态分布的变化特征。结果表明:添加稻草和淹水培养使土壤pH值向6.0—7.5的区间转变,并
2、显著提高了土壤可溶性有机碳(DOC)含量。清洁土壤添加镉污染稻草后,土壤DTPA(Diethylenetriaminepentacetateacid)提取态cd含量增加23.5%一225.0%,土壤酸提取态和可还原态镉的相对比例显著提高,而残渣态和可氧化态镉的比例则相对降低,其效果随稻草添加量的增加显著增强;镉污染土壤添加镉污染稻草后,DTPA提取态镉仅在培养初期(2d)略有提高,随培养时间的延长,DTPA提取态镉含量显著降低(28.6%~41.1%),且添加稻草促使酸提取态镉向可还原态镉和残渣态镉转化。研究表明,镉污染稻草进入清洁土壤会带来镉污染的扩散风险,而
3、进入供试污染土壤后则能在一定程度上降低污染土壤中镉的有效性。关键词:稻草还田;Cd污染;清洁土壤;污染土壤;土壤Cd形态中图分类号:X53文献标志码:A文章编号:1672—2043(2013)09—1786—07doi:10.116546aes.2013.09.012EfectsofCd-contaminatedRiceStrawInc0rp0rati0nonTransformationofCdFormsinSoilsCAOXiao-ling。,LUOZun-chang,HUANGDao-you’,ZHUQi-hong,LIUShou-long,RAOZhong
4、-xiu,RENXue-~i,XIYuan(1.KeyLaboratoryforAgro—ecologicalProcessesinSubtropicalRegion,InstituteofSubtropicalAgricuhure,CAS,Hunan410125,China;2.HunanSoilandFertilizerInstitute,Hunan410125,China).Abstract:ToinvestigatetheeffectsofCd—contaminatedricestrawincorporationontheCdfractionsandth
5、eavailableCdcontentsinsoils(anon-contaminatedsoil,pH=4.72andaCd—contaminatedsoil,pH=7.90)anincubationexperiment(28d)wasconducted.Theresultsindi—catedthataftertheadditionofricestraw(bothcontaminatedandcleanricestmw)thepHinbothsoilswereneutralized(6.0to7.5)andthecontentsofdissolvedorga
6、niccarbon(DOC)inbothsoilsweresharplyincreasedinthefirst2dandreducedgraduallyintherestincubationperiod.Atthesametime.Cd—contaminatedricestrawincorporationsignificantlyincreasedtheDTPAextractableCdbv23.5%~225.0%andtheproportionsofacid-extractableandreducibleCd,andrelativelydecreasedthe
7、proportionsofresidualandoxidizableCdincleansoil.TheseeffectswereenhancedwiththeincreasingofCd-contaminatedricestrawadded.ereas.inCd—contaminatedsoil.theDTPAex—tractableCdwasslightlyincreasedfirstly。andthendecreased(by28.6%~41.1%)continuallyduringtherestincubationperiod(2-28d)whenCd—c
8、ontaminatedr
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