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本文对瑞典南部一个区食物和饲料循环中的植物营养流作了定量分析。在牲畜密度比瑞典平均值高30%的农业系统中,氮和磷盈余分别为100kgN/hm~2和9kg P/hm~2,农业中的营养元素盈余与牲畜密度有关。大部分氮盈余以硝态氮和氨态氮的方式排放,而磷盈余则积累于土壤中。该区食物消费产生的有机废物中的营养元素相当于22kg N/hm~2和4kg P/hm~2,相对于耕地的人口密度比瑞典的平均值高15%。来自食物消费的剩余产品经过当前处理系统,食物摄入中11%的磷和低于3%的氮要再循环返回到耕地中。
This paper presents a quantitative analysis of plant nutrient flows in the food and feed cycle in a district of southern Sweden. In agricultural systems where livestock density is 30% higher than the Swedish average, N and P surpluses are 100 kg N / hm -2 and 9 kg P / hm -2, respectively, and the nutrient surplus in agriculture is related to the stocking density. Most nitrogen surpluses are emitted as nitrate and ammonia nitrogen, while phosphorus surpluses accumulate in the soil. The nutrient content of organic waste from food consumption in this area is equivalent to 22kg N / hm 2 and 4kg P / hm 2, and the population density relative to cultivated land is 15% higher than the average in Sweden. The remaining product from food consumption passes through the current treatment system, 11% of the phosphorus in the food intake and less than 3% of the nitrogen are recycled back to the farmland.