| 2000~2018年长三角土地利用变化对农田生态系统氨排放的影响 |
| 摘要点击 2414 全文点击 660 投稿时间：2020-10-27 修订日期：2020-12-24 |
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| 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 emissions agricultural sources land use change nitrogen fertilizer application Yangtze River Delta (YRD) |
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| 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. |
