文献类型：期刊文献

英文题名：Aggravation of nitrogen losses driven by agriculture and livestock farming development on the Qinghai-Tibet Plateau

作者：Wang, Fangfang[1] Liu, Shiliang[1] Liu, Hua[1] Liu, Yixuan[1] Yu, Lu[1] Wang, Qingbo[1] Dong, Yuhong[2] Sun, Jian[3] Tran, Lam-Son Phan[4,5] Li, Weiqiang[6]

第一作者：Wang, Fangfang

通信作者：Liu, SL[1]

机构：[1]Beijing Normal Univ, Sch Environm, State Key Lab Water Environm Simulat, Beijing 100875, Peoples R China;[2]Chinese Acad Forestry, Res Inst Forestry, Beijing 100091, Peoples R China;[3]Chinese Acad Sci, Inst Tibetan Plateau Res, Beijing 100101, Peoples R China;[4]Texas Tech Univ, Inst Genom Crop Abiot Stress Tolerance, Dept Plant & Soil Sci, Lubbock, TX 79409 USA;[5]Duy Tan Univ, Inst Res & Dev, Da Nang 550000, Vietnam;[6]Chinese Acad Sci, Northeast Inst Geog & Agroecol, Key Lab Mollisols Agroecol, Changchun 130102, Peoples R China

年份：2023

卷号：326

外文期刊名：JOURNAL OF ENVIRONMENTAL MANAGEMENT

收录：;EI(收录号：20233414579243);Scopus(收录号：2-s2.0-85142768454);WOS:【SCI-EXPANDED(收录号:WOS:000997448300001)】；

基金：The work was supported by the Second Scientific Expedition to the Qinghai -Tibet Plateau (No. 2019QZKK0405-05) , National Natural Sci- ences Fund Project (No. 42271097) and National Key Research and Development Project (No. 2022YFF1303204) .

语种：英文

外文关键词：N losses; Agriculture and livestock husbandry; Crop -livestock systems; Driving force; Qinghai-tibet plateau

摘要：Nitrogen (N) losses from crop-livestock production is a major threat to the environment and human health at regional, national and global scales. A comprehensive understanding of the sources, spatiotemporal distribution and drivers of N losses is of great significance for mitigating its negative impacts and promoting N sustainable management. Here, we used the county-scale N flow model to quantitatively analyze the N losses and their driving forces of crop-livestock production on the Qinghai-Tibet Plateau (QTP). Between 2000 and 2018, the total N losses increased for more than 79% of counties on the QTP. The hotspot areas accounted for over 80% of total N losses, expanding from the east and south to the north and west of the QTP. NH3 was the main source of atmospheric N losses (over 80%) while the direct discharge of manure was the main source of water N losses. Structural equation modeling (SEM) showed that chemical fertilizer caused the largest driving effect on atmo-spheric N losses, and the total output value of agriculture and forestry was the main driver of water N losses. Uneven distribution of crop production and livestock contributed to the aggravation of N losses. Over 70% of counties had grater manure N excretion than crops could take up, and large proportion of manure could not be returned to the field. More than 90% of the counties used grater amount of chemical fertilizer N than crops could take up, indicating that livestock manure has not yet fully replaced chemical fertilizer N. The results provide effective guidance and support for N utilization and management of livestock in agricultural and pastoral areas.