文献类型：期刊文献

英文题名：Long-term dynamics of nitrogen flow in a typical agricultural and pastoral region on the Qinghai-Tibet Plateau and its optimization strategy

作者：Wang, Fangfang[1] Liu, Shiliang[1] Liu, Yixuan[1] Sun, Yongxiu[1] Yu, Lu[1] Wang, Qingbo[1] Dong, Yuhong[2] Beazley, Robert[3]

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]Cornell Univ, Coll Agr & Life Sci, Dept Nat Resources, Fernow Hall 302, Ithaca, NY 14853 USA

年份：2021

卷号：288

外文期刊名：ENVIRONMENTAL POLLUTION

收录：;EI(收录号：20212910649386);Scopus(收录号：2-s2.0-85110173855);WOS:【SCI-EXPANDED(收录号:WOS:000696805300006)】；

基金：The work was supported by the second scientific expedition to the Qinghai-Tibet Plateau (No. 2019QZKK0405-05) and National Natural Sciences Foundation of China (No. 41571173).

语种：英文

外文关键词：Agricultural system; Nitrogen flow; Food production and consumption; Environmental N losses; Scenario analysis

摘要：Nitrogen (N) plays a central role in livestock development and food production in agricultural and pastoral regions, while its flow and loss can affect environmental quality, biodiversity and human health. A comprehensive understanding of the sources, patterns and drivers of N flow helps to alleviate its negative effects and promote sustainable management. We developed a county-scale N flow model to quantitatively analyze the N use efficiency (NUE), N losses and their driving forces in the food production and consumption system (FCPS) on the Qinghai-Tibet Plateau (QTP). More sustainable N utilization was further investigated through scenario analyses. Our results revealed that N fluxes doubled from 1998 to 2018 to maintain the growing demands for human food production and consumption in Ledu County, which was related to the increasing N losses to the atmosphere and water environment. The surging N fluxes greatly changed the N distribution pattern, resulting in a relatively low NUE (mean value: 29.41%) in the crop-production subsystem (CPS) and a relatively high NUE (mean value: 23.50%) in the livestock-breeding subsystem (LBS). The CPS contributed the most to the N losses. The urban population, animal-derived consumption, crop planting structure, imported fodder and N fertilizer application level were closely associated with N losses. The scenario analysis indicated that combined reasonable changes in planting structure, precision animal feeding, fertilizer management, diets and conversion of cropland into pasture could reduce N losses in 2030 to 5%-61% of Business as usual level. Our results highlighted the strong anthropogenic impact on the N flow of food production and consumption and suggested a sustainable N flow management strategy to harmonize the relationship between N flow and anthropogenically driven factors on the QTP.