外加阿特拉津土壤的微生物生物量对氮磷肥料的动态响应

Response of Soil Microbial Biomass Toward Nitrogen and Phosphorus in Atrazine -Added Soils

通过室内恒温暗培养研究了在阿特拉津污染的3种不同水稻土(淡涂泥水稻土、青紫泥水稻土和黄筋泥水稻土)施用无机肥料对土壤微生物生物量碳的影响。结果表明,浓度为10mg·kg-1的阿特拉津明显降低了3种水稻土微生物生物量碳的含量。在整个培养过程中,淡涂泥水稻土、青紫泥水稻土和黄筋泥水稻土分别平均降低了19.5%,8.6%,7.3%。施用无机肥料则显著提高了土壤微生物生物量碳的含量。在3种土壤中,不同处理对土壤微生物生物量碳影响程度均为:阿特拉津处理土壤+氮肥+磷肥>阿特拉津处理土壤+氮肥>阿特拉津处理土壤+磷肥>对照>阿特拉津处理土壤。施用不同无机肥料后不同土壤微生物生物量碳增加程度不同,与对照相比,氮磷配施、单施氮肥、单施磷肥处理的土壤微生物量碳的增加程度均为青紫泥水稻土>黄筋泥水稻土>淡涂泥水稻土。

An incubation experiment was conducted to study the re sponse of soil mic robial biomass C to nitrogen and phosphorus in three contamin ated -soils(taken frompaddy field on desalting m ud polder,blue clayed paddy soil and paddy field on quaternary red soil)by atrazine herbicide at a rate of 10mg·kg -1 .Our results showed that soil microb ial biomass C were significantly decre ased for the soils contaminated by atrazine a t a rate of 10mg ·kg -1 .The average decrements were 19.5%,8.6%,and 7.3%in paddy fie ld on desalting mud polder ,blue clayed paddy soil and paddy field on quatern a ry red soil,respectively.Fertili zation significantly in-creased microbial bi omass C in the atrazine -contaminating soils.The effects of different treatmen ts on mic robial biomass C were in an order as:ANP >AN>AP>A>CK in all paddy soils used.In contrast to contro l,the increment of microbial biomass C were :paddy field on desalting mud polder>blue clayed paddy soil >paddy field o n quaternary red soil in ANP?AN?AP treatments,re-spectively.