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1、第24卷第5期环境科学学报Vol.24,No.52004年9月ACTASCIENTIAECIRCUMSTANTIAESep.,2004+文章编号:025322468(2004)0520858207中图分类号:X13113,S13113文献标识码:A水田土壤中水溶性有机物的产生动态及对土壤中重金属活性的影响:田间微区试验11312王艮梅,周立祥,占新华,黄焕忠(11南京农业大学资源与环境学院,南京210095;21香港浸会大学生物系,香港九龙)摘要:采用田间微区试验研究不同施肥处理对土壤水溶性有机物(DOM)的动态变化及其对土壤Cd活性的影响
2、1结果表明,与施化肥对照处理相比,施用有机肥后土壤中DOM含量明显增加.但随着水稻的生长DOM呈不断下降的趋势,而对照处理的变幅不大;在水稻整个生长过程中根际DOM含量不断增加且都高于对应时期土壤DOM的含量,并至水稻扬花期最大,此时,3种处理的根际产生DOM浓度(DOM浓度以水溶性有机碳(DOC)计,以下同)分别为:绿肥与化肥配施处理组(GM)(14102-1)>猪粪与化肥配施处理组(PM)(11112mg·L-1)>对照处理组(F)(1018mg·L-1).水稻扬花期后,各处理的DOM含量mg·L不断下降.试验还指出,有机肥施用后根际及
3、土体土壤中交换态及有机结合态Cd含量显著增加,是对照处理的2倍之多,同时发现,水稻收获后土壤交换态Cd的含量与此时的土壤DOM含量呈明显的正相关(r33土体=019266,n=8;r根际=33019389,n=8).施用有机肥改良重金属污染土壤应该谨慎.关键词:水溶性有机物(DOM);动态;镉;稻田Dynamicsofdissolvedorganicmatteranditseffectonmetalavailabilityinpaddysoil:Fieldmicro2plottrials11312WANGGenmei,ZHOULixiang
4、,ZHANXinhua,JoanthanW.C.Wong(11CollegeofResourceandEnviron2mentalSciences,NanjingAgriculturalUniversity,Nanjing210095;21DepartmentofBiology,HongKongBaptistUniversity,KowloonTong,HongKong)Abstract:Theaimofthisstudywastoinvestigatethedynamicsofdissolvedorganicmatter(DOM)andi
5、tseffectoncadmiumavailabilityinpaddysoilamendedwithgreenmanure(ViciafabaL.),pigmanure,andferilizerinfieldmicro2plottrialwithrice(OrysasativaL.).TheresultsshowedthattheconcentrationofDOMintheorganicwastes2treatedsoilswasincreaseddrastically,ascomparedtothecontroltreatmentwi
6、thouttheadditionoforganicwastes.TheconcentrationofDOMintheorganicwastes2treatedsoilsdecreasedwithricegrowth,whilethecon2centrationofDOMincontroltreatmentwassimilarthroughoutricegrowth.Throughoutthegrowingseason,theconcentrationsofDOMinrootzonewerehigherthanthoseinthebulkso
7、il,andincreasedwithricegrowthandreachedmaximuminriceflowering.Thehighestconcentrations-1-1-1ofDOMinrootzonesoilwere14102mg·Lforgreenmanuretreatment,11112mg·Lforpigmanuretreatment,and10185mg·Lforthecontrol.DOMconcentrationsinalltreatmentsdecreasedinlaterstageofricegrowth.It
8、wasalsoobservedthatafterriceharvestedtheconcen2trationsofexchangeableandorganic2boundcadm
