摘要
采用大田试验,探讨不同用量土壤调理剂对镉污染农田土壤养分、质地、微团聚体、酶活性及微生物数量等影响。试验设置T0、T1、T2、T3、T4和T5共6个处理,对应添加土壤调理剂0、1500、3000、4500、6000和7500 kg·hm^(-2)。结果表明:施用土壤调理剂后增加了土壤pH值(0.66%~6.75%)、阳离子交换量(22.68%~64.45%)、碱解氮(7.94%~29.26%)和速效钾(0.28%~21.99%),而对土壤质地、有效磷、微团聚体组成影响较小;影响了土壤微生物环境,抑制了脲酶、过氧化氢酶活性以及细菌和放线菌数量。土壤调理剂通过影响土壤理化性质及微生物环境,降低了土壤有效态镉(12.34%~24.78%)和糙米镉含量(7.69%~64.10%)。相关性表明:施用量与土壤pH值、阳离子交换量、碱解氮和速效钾呈显著正相关,而与有效磷、脲酶和过氧化氢酶呈显著负相关,但与土壤有效态镉和糙米镉相关性不明显。综上,从镉污染修复效果、土壤环境影响及经济成本考虑,以T2(3000 kg·hm^(-2))处理效果最佳。
A field experiment was set up to explore the effects of different application rates of soil conditioners on soil nutrients,texture,microaggregates,enzyme activity and microbial abundance in cadmium contaminated paddy fields.Six treatments were tested in the experiment,including T0,T1,T2,T3,T4 and T5,corresponding to the addition of soil conditioners 0,1500,3000,4500,6000 and 7500 kg·hm^(-2).The results showed that the soil conditioner,soil pH(0.66%~6.75%),bulk density(0.97%~9.71%),cation exchange capacity(22.68%~64.45%),alkaline nitrogen(7.94%~29.26%)and available potassium(0.28%~21.99%)were increased under different treatments.However,it has little effect on texture,available phosphorus and micro-aggregate composition.Which affects soil microbial environment,inhibited urease and catalase activity,the adundance of bacteria and actinomycetes.Soil conditioners reduced soil available cadmium(12.34%~24.78%)and brown rice cadmium content(7.69%~64.10%)by affecting soil physicochemical properties and microbial environment.The correlation analysis showed that the application rate was significantly positively correlated with soil pH,cation exchange capacity,alkaline nitrogen and available potassium,it was significantly negatively correlated with available phosphorus,urease and catalase,and had no significant correlation with soil available cadmium and brown rice cadmium.In summary,considering the effects of cadmium remediation,soil environmental impact and economic costs,T2(3000 kg·hm^(-2))was the optimum treatment.
作者
林小兵
武琳
王惠明
刘晖
郭乃嘉
张鸿燕
何波
黄欠如
周利军
LIN Xiao-bing;WU Lin;WANG Hui-ming;LIU Hui;GUO Nai-jia;ZHANG Hong-yan;HE Bo;HUANG Qian-ru;ZHOU Li-jun(National Red Soil Improvement Engineering Technology Research Center,Jiangxi Institute of Red Soil,Nanchang 330046,China;Jiangxi Agricultural Ecology and Resource Protection Station,Nanchang 330046,China;Agricultural Bureau of Pingxiang,Pingxiang 337000,China)
出处
《长江流域资源与环境》
CAS
CSSCI
CSCD
北大核心
2021年第7期1734-1745,共12页
Resources and Environment in the Yangtze Basin
基金
江西省重大科技研发专项项目(20194ABC28010)
江西省重点研发计划项目(20171ACG70022)。
关键词
镉
土壤调理剂
施用量
土壤环境
酶活性
cadmium
soil conditioner
application rate
soil environment
enzyme activity
