论文部分内容阅读
在20年前,畜禽粪尿被视为农业之宝,而今在很多地方,畜禽粪尿已成为畜产公害,严重污染了环境,并造成许多传染病的传播,引起了畜牧行业和环保界的普遍关注。下面就畜禽粪便造成污染的原因、污染状况及治理方法作一综述。 一.家畜粪尿造成环境污染的原因 1.畜牧场规模过大,布局过密。过去,我国的畜牧业一直是农业的附属产业,畜禽分散饲养在农区,畜禽排泄的粪尿就近施用到农田里,不存在对环境的污染问题。从八十年代起,畜牧业迅速发展,生产规模迅速扩大,并向城镇、工矿区
Livestock manure was considered a treasure of agriculture 20 years ago. In many places, livestock excrement has become a livestock nuisance that has seriously polluted the environment and caused the spread of many infectious diseases. This has caused the livestock industry and the environmental protection community The general concern. Here are the causes of pollution caused by livestock manure, pollution and treatment methods are reviewed. I. Causes of environmental pollution caused by livestock excrement 1. The livestock farms are oversized and the layout is too dense. In the past, the livestock husbandry in our country has always been an ancillary industry in agriculture. Livestock and poultry are scattered in the agricultural areas. Excreta excreted by livestock and poultry is applied to the farmland nearby without any pollution to the environment. Since the eighties, the rapid development of animal husbandry, the rapid expansion of production scale, and to urban areas, industrial and mining areas