猪发酵床不同垫料中、累积规律

为研究在发酵床养猪过程中不同组成垫料的As、Hg累积规律，本文以木屑、稻壳和秸秆为原料，配制成3种垫料处理，分别为木屑（S）、木屑+稻壳（SR）和木屑+稻壳+秸秆段（SRS），在一年半的时间里，测定了4批育肥猪养殖结束时不同层次垫料中As、Hg含量，分析了长期使用后不同发酵床垫料中As、Hg累积情况，为发酵床废弃垫料的后续农用提供理论依据。结果表明，随着猪养殖批次的延长，3种处理及其不同层次垫料As、Hg含量均存在不同程度增加。4批猪养殖结束时，As累积量最大的是SRS处理的发酵床，为1921.7 mg·栏-1，Hg累积量最大的也是SRS处理的发酵床，为21.1 mg·栏-1。S、SR、SRS处理的As、Hg含量分别为2.921、2.190、2.621 mg·kg-1和0.048、0.036、0.042 mg·kg-1，均符合《农业行业标准有机肥料》（NY 525—2012）、《食用农产品产地环境质量评价标准》（HJ/T 332—2006）的标准限值。

Accumulation of Arsenic and Mercury in Different Bio-bed Padding Materials

In order to study the accumulation and distribution of As, Hg in different bio-bed padding materials while implementing bio-bed raising method, three kinds of bio-bed padding materials were well designed, which consisted of sawdust(S), sawdust+rice husk(SR)and sawdust+rice husk+straw(SRS). For a year and a half, the contents of As, Hg at different depth were measured when four groups of fatten-ing pig breeding had finished to analyze the accumulation and distribution of As, Hg in different bio-bed padding materials, which could pro-vide a theoretical basis for follow-up application of bio-bed padding materials in agriculture. The results showed that, the accumulation of As and Hg, at different levels, occurred during four pig-raising cycles. When 4 groups of fattening pig breeding finished, the largest accumula-tion of As and Hg occurred in SRS bio-beds, respectively reached 1 921.7 mg per sty and 21.1 mg per sty. The As and Hg contents of S, SR, SRS were 2.921, 2.190, 2.621 mg·kg-1 and 0.048, 0.036, 0.042 mg·kg-1, respectively, which met the China’s Organic Fertilizer Agriculture Standards(NY 525—2012), and Farmland Environmental Quality Evaluation Standards For Edible Agricultural Products(HJ/T 332—2006).