海南省农业废弃物源活性氮排放特征研究

Characteristics of Active Nitrogen Emission from Agricultural Waste System in Hainan Province

以海南省农业秸秆和畜禽粪尿为研究对象,测算1990年-2019年海南省18个市县的农业废弃物源活性氮排放量及密度,分析并确定海南省氮污染排放严重的城市。研究发现1990年-2019年海南省农业废弃物总量呈现M型的变化趋势。其中,畜禽粪尿量的趋势与其一致,秸秆量的变化趋势不大。研究期内,农业废弃物源活性氮总量呈现先上升后下降再缓慢上升并趋于稳定的趋势1998年达到峰值。畜禽粪尿活性氮是环境排放活性氮的主要来源,占比超出秸秆活性氮12%根据活性氮排放总量和排放强度,确定了2019年海南省有8个“高氮市县”、2个“中氮市县”,6个“低氮市县”。

Taking Hainan s agricultural straw and livestock and poultry manure as the research objects,the amount and density of active nitrogen emissions from agricultural waste sources in 18 cities and counties in Hainan Province from 1990 to 2019 were estimated,and the cities with severe nitrogen pollution emissions were analyzed and determined.The study found that:The total amount of agricultural waste in Hainan Province from 1990 to 2019 showed an M-shaped change trend.Among them,the trend of the amount of livestock and poultry manure is consistent with it,and the amount of straw changes little.During the study period,the total amount of active nitrogen from agricultural waste sources showed a trend of first increasing,then decreasing and then slowly increasing,reaching a peak in 1998.Livestock and poultry manure is the main source of active nitrogen released from the environment,accounting for 12%more than straw active nitrogen.According to the total reactive nitrogen emissions and emission intensity per area,8 cities and counties were identified as“high nitrogen zones”、2 as“medium nitrogen zones”and 6 as“low nitrogen zones”in 2019.