文献类型：期刊文献

英文题名：Livestock grazing may weaken N deposition effects on soil C:N:P stoichiometry in alpine grassland of the Qinghai-Tibetan Plateau

作者：Shen, Hao[1] Dong, Shikui[1] Li, Shuai[6] Zheng, Hanzhong[2] Wang, Qiyun[5] Liu, Junxiang[3] Xiao, Jiannan[4] Zuo, Hui[1] Zhang, Ran[1] Yang, Xiuchun[1]

第一作者：Shen, Hao

通信作者：Dong, SK[1]

机构：[1]Beijing Forestry Univ, Sch Grassland Sci, Beijing 100083, Peoples R China;[2]Radboud Univ Nijmegen, Dept Environm Sci, NL-6525 AJ Nijmegen, Netherlands;[3]Chinese Acad Forestry, Res Inst Forestry, State Key Lab Tree Genet & Breeding, Key Lab Tree Breeding & Cultivat,State Forestry Ad, Beijing 100091, Peoples R China;[4]Beijing Normal Univ, Sch Environm, State Key Joint Lab Environm Simulat & Pollut Cont, Beijing 100875, Peoples R China;[5]Henan Univ, Sch Life Sci, State Key Lab Crop Stress Adaptat & Improvement, Kaifeng 475004, Peoples R China;[6]Shanxi Agr Univ, Coll Resource & Environm, Taigu 030801, Peoples R China

年份：2023

卷号：233

外文期刊名：CATENA

收录：;Scopus(收录号：2-s2.0-85170424853);WOS:【SCI-EXPANDED(收录号:WOS:001080242700001)】；

基金：This work was supported by the Fundamental Research Funds for the Central Universities (BLX202166) and the Second Tibetan Plateau Scientific Expedition and Research Program (2019QZKK0307) .

语种：英文

外文关键词：N deposition; Soil C:N:P stoichiometry; Alpine grassland; Livestock grazing

摘要：Increased nitrogen (N) deposition is expected to impact the grassland ecosystem by changing soil C:N:P stoichiometry. However, N deposition effects on soil C:N:P stoichiometry is still in debate. In addition, we still know less about how N deposition affects soil C:N:P stoichiometry in grazed grassland as most studies focus on natural grassland. Hence, it is necessary to examine N deposition effects on both ungrazed and grazed grassland and clarify the disparity. We conducted a simulated N deposition experiment in ungrazed and grazed grassland of two grassland types including alpine meadow (AM) and alpine steppe (AS) to test such effects. Results showed that N deposition effects on ungrazed and grazed grassland varied. Soil C, soil N, soil P, soil C:N, soil N:P and soil C:P were significantly affected by N deposition in ungrazed grassland while only soil N, soil P, soil C:N, soil N:P were significantly affected by N deposition in grazed grassland. Soil C and soil N:P were not sensitive to N deposition in grazed grassland. N deposition negatively affects soil P in ungrazed grassland yet positively affected soil P in grazed grassland. N deposition effects accounted for 30% in ungrazed grassland, while significantly decreased to 12% when grazing effects were considered suggesting that livestock grazing might weaken N deposition effects on soil C:N:P stoichiometry. In addition, other climate and environmental factors such as MAT, MAP, and grassland type can also mediate N deposition effects on soil C:N:P stoichiometry in both ungrazed and grazed grasslands. On the whole, our findings suggested that there existed a disparity of N deposition effects on soil C:N: P stoichiometry between ungrazed and grazed grassland, and livestock grazing may weaken N deposition effects on soil C:N:P stoichiometry in alpine grassland of the Qinghai-Tibetan Plateau.