本文選題：蘇州市　切入點：農(nóng)田生產(chǎn)　出處：《土壤》2017年05期

【摘要】：為了解食物鏈過程廢棄物氮流情況及其環(huán)境影響,以我國經(jīng)濟發(fā)達地區(qū)蘇州市為對象,基于農(nóng)田生產(chǎn)-畜禽養(yǎng)殖-家庭消費系統(tǒng),使用清單核算方法,估算了該市農(nóng)田種植、畜禽養(yǎng)殖及家庭食物消費活動產(chǎn)生的廢棄物氮量,并對廢棄物氮的資源化利用水平及環(huán)境影響狀況進行了評價。結(jié)果表明:蘇州市農(nóng)田生產(chǎn)-畜禽養(yǎng)殖-家庭消費系統(tǒng)一年共產(chǎn)生廢棄物氮5.35萬t,其中59.76%來自居民食物消費活動,57.53%損失進入環(huán)境。秸稈氮、畜禽糞尿氮、餐廚垃圾氮和人糞尿氮的資源化率分別為84.03%、49.26%、37.72%和21.99%。1.70萬t廢棄物氮進入水環(huán)境,造成的水體氮濃度達到4.3 mg/L,是Ⅲ類水環(huán)境質(zhì)量標準的4.3倍;大氣環(huán)境廢棄物氮負荷量0.58萬t,其主要來自糞尿廢棄物,并以氨氮形態(tài)為主;廢棄物氮的農(nóng)田負荷警戒值為0.15~0.22,屬Ⅰ級無污染水平。通徑分析表明人口因素和政策科技因素是影響廢棄物氮環(huán)境排放的兩個最主要驅(qū)動因素。本文建議蘇州市在農(nóng)業(yè)生產(chǎn)中增施糞尿有機肥,在廢棄物管理中通過秸稈多樣化利用、糞尿科學管理以及餐廚垃圾專門處理等綜合措施來改善當?shù)丨h(huán)境污染狀況。
[Abstract]:In order to understand the situation of nitrogen flow in food chain process waste and its environmental impact, based on the farmland production, livestock breeding and household consumption system, the farmland planting in Suzhou City, an economically developed region of China, was estimated by using the inventory accounting method.The amount of waste nitrogen produced by livestock and poultry breeding and household food consumption was evaluated. The utilization level of waste nitrogen and its environmental impact were evaluated.The results showed that 53500 tons of nitrogen was produced by the system of farm production, livestock and poultry breeding and household consumption in Suzhou City a year, 59.76% of which came from the food consumption activities of residents and 57.53% of them were lost to the environment.The utilization rates of straw nitrogen, animal manure and urine nitrogen, food waste nitrogen and human fecal urine nitrogen were 84.03%, 49.26% and 21.99.17 million tons respectively. The nitrogen concentration in water reached 4.3 mg / L, which was 4.3 times higher than that of Class 鈪，

本文編號：1711894