摘要
设置不施肥(CK)、常规化肥(CF)、菌渣提供25%N(M1)、菌渣提供50%N(M2)、菌渣提供75%N(M3)、猪粪提供25%N(S1)、猪粪提供50%N(S2)和猪粪提供75%N(S3)共8个施肥处理,研究小麦和水稻成熟期作物根、茎叶和籽粒中Cu、Cd、Pb和Zn含量及富集情况,并利用潜在生态风险评价及健康风险评价评估作物器官不同利用时风险状况。结果表明:作物重金属含量的顺序为根>茎叶>籽粒,重金属元素在各器官中均呈现出Zn>Cu>Pb>Cd,而富集系数表现为Cd>Zn>Cu>Pb;替代相同比例N肥时,猪粪还田下作物重金属含量及富集系数均比菌渣高,随着施用有机物料量增加作物重金属含量呈增加趋势,S3处理作物重金属含量及富集系数均为最高;作物器官风险系数顺序为猪粪还田(S1~S3)>常规化肥(CF)>菌渣还田(M1~M3),菌渣提供25%~50%N的施肥方案带来的重金属风险较小。
Mushroom residue （ MR ） and swine manure （ SM ） not only provide redundant nutrient substance for crops growth, but also bring pollution risks of some heavy metals for crops. In this study, the experiment with eight treatments, including CK（blank control, no fertilizer）, CF（conventional fertilizer）, M1（25% N from MR）, M2（50% N from MR）, M3（75% N from MR）, S1 （25% N from SM）, S2（50% N from SM） and S3（75% N from SM） was conducted in Qiquan of the Chengdu Plain. The concentrations of Cu, Cd, Pb and Zn in root, straw（stem and leaf） and grain were determined by atomic absorption spectrophotometer. Bioconcentration factor, potential ecological risk and health risk index were used to evaluate the enrichment characteristics and pollution statuses of crop organs under different treatments. The results showed that Cu, Cd, Pb and Zn concentrations in root, straw and grain for all treatments reduced in sequence. And heavy metal concentra- tions in organs were Zn〉Cu〉Pb〉Cd, but bioconcentration factors showed Cd〉Zn〉Cu〉Pb. Their concentrations in organs of crop were more under SM than under MR as the same urea substitute, and demonstrated increase trends with increasing the rates of the two organic materi- als. And heavy metal concentrations and bioconeentration factors in organs of crop under all treatments were in the low risk level. Among these treatments, the concentrations and bioeoncentration factors in organs of crop under S3 treatment had the highest risk. The risk indices in organs of crop under treatments showed S3〉S2〉SI〉CF〉M3〉M2〉M1. Generally, the fertilizer schedules of 25%-50% N from MR（P〉 0.05 ） had lower heavy metal risk than the other treatments.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2017年第2期230-240,共11页
Journal of Agro-Environment Science
基金
四川省科技支撑计划资助项目(2014NZ0044
2013NZ0027)~~
关键词
菌渣
猪粪
重金属
富集特征
风险评价
mushroom residue
swine manure
heavy metal
enrichment characteristic
risk assessment
