长株潭地区人为源氨排放清单及分布特征

根据收集到的长株潭地区各类人为源氨排放的活动水平数据和排放系数,建立了长株潭地区2013年人为源氨排放清单,并根据空间特征数据进行了3 km×3km的空间网格分配.结果表明,长株潭地区2013年人为源氨排放总量为7.27×10~4t,排放强度为2.59 t·km~(-2);其中,畜禽养殖业和农田生态系统为最主要的氨排放源,氨排放分担率分别达58.60%和29.73%;畜禽养殖业中,肉牛、蛋鸡和肉猪是主要贡献源,分别占畜禽养殖业氨排放总量的26.26%、21.40%和18.43%;宁乡县、湘潭县和浏阳市为氨排放量较大的县市,分别占长株潭地区氨排放总量的17.49%、12.82%和12.02%;石峰区和岳塘区的氨排放强度最大,分别达到了9.14 t·km~(-2)和5.01 t·km~(-2).空间分布特征显示排放量较大的网格主要是大型点源.

Anthropogenic Ammonia Emission Inventory and Its Spatial Distribution in Chang-Zhu-Tan Region

Based on the best available activity data and emission factors, an anthropogenic emission inventory of NH₃ was established for the Chang-Zhu-Tan region with spatial resolution of 3 km×3 km. The results showed that the total quantity of NH₃ discharged from anthropogenic sources in the Chang-Zhu-Tan region was 7.27×10⁴ t, and the average intensity of NH₃ emission was 2.59 t ·km^-2. The livestock and poultry industry, and the farmland ecosystem, were the major contribution sources of the anthropogenic NH₃ emissions, accounting for 58.60% and 29.73%, respectively. As for NH₃ emission from the livestock and poultry industry, the major contributors were beef, laying hen and pork pig, accounting for 26.26%, 21.40%and 18.43%, respectively. In the Chang-Zhu-Tan region, the quantities of NH₃ emissions from Ningxiang county, Xiangtan county and Liuyang city were larger than those of the other districts, accounting for 17.49%, 12.82% and 12.02%, respectively. The intensities of NH₃ emission from Shifeng and Yuetang districts were larger than those from other districts, reaching up to 9.14 t ·km^-2 and 5.01 t ·km^-2, respectively. The spatial distribution characteristics revealed that the NH₃ emission mostly originated from large point sources.