中文关键词氨排放农业源土地利用变化氮肥施用长三角(YRD) 英文关键词ammonia emissionsagricultural sourcesland use changenitrogen fertilizer applicationYangtze River Delta (YRD)

作者	单位	E-mail
王文锦	上海大学环境与化学工程学院, 上海 200444	wwj722713@shu.edu.cn
王卿	上海市环境科学研究院, 上海 200233
朱安生	上海大学环境与化学工程学院, 上海 200444
黄凌	上海大学环境与化学工程学院, 上海 200444
顾莹	上海工程技术大学航空运输学院, 上海 201620
王杨君	上海大学环境与化学工程学院, 上海 200444
王敏	上海市环境科学研究院, 上海 200233
李莉	上海大学环境与化学工程学院, 上海 200444	Lily@shu.edu.cn

中文摘要 根据Landsat卫星遥感影像解译了2000~2018年长江三角洲（Yangtze River Delta，YRD）城市群历史土地利用变化，结合氮肥施用变化情况，研究了由于土地利用变化带来的农田生态系统氨（NH₃）排放变化.结果表明，伴随着快速的城市化进程，YRD耕地面积逐渐减少，耕地面积从2000年的276269 km²（占总面积的49%）减少到2018年的244001 km²（占总面积的44%）.土地利用变化和氮肥施用变化对农田生态系统NH₃排放的影响主要包括土壤本底和氮肥施用两部分.2000~2018年，YRD氮肥施用产生的NH₃排放量从690 kt·a^-1减少到541 kt·a^-1（减少22%）；土壤本底产生的NH₃排放量从32 kt·a^-1减少到29 kt·a^-1（减少9%）.结果表明，近20年来，YRD城镇化进程加快，耕地面积显著减少，进一步带来氮肥施用量降低，使得农田生态系统NH₃排放量减少. 英文摘要 Based on Landsat satellite remote sensing images, this study interprets land use changes in the Yangtze River Delta (YRD) region from 2000 to 2018. Combined with changes in nitrogen fertilizer application, the changes in ammonia emissions from farmland ecosystem due changes in land use and nitrogen fertilizer application were further investigated. The results show that along with the rapid urbanization process, the area of cultivated land in the YRD region has gradually decreased from 276269 km² (49% of total land area) in 2000 to 244001 km² (44%) in 2018. The effects of changes in land use and nitrogen fertilizer application on ammonia emissions from farmland ecosystems mainly include emissions from soil background and nitrogen fertilizer application. From 2000 to 2018, ammonia emissions due to the application of nitrogen fertilizer decreased from 690 kt·a^-1 to 541 kt·a^-1 (relative decrease by 22%), while the ammonia emissions from the soil background reduced from 32 kt·a^-1 to 29 kt·a^-1 (decrease by 9%). During the past 20 years, urbanization in the YRD region has accelerated, and the area of cultivated land and the total amount of nitrogen fertilizer application have significantly reduced, thus resulting in reductions in ammonia emissions from the farmland ecosystem.

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