Short-term effects of yak and Tibetan sheep urine deposition on soil carbon and nitrogen concentrations in an alpine steppe of the northern Tibetan Plateau, China  

作　　者：DU Zi-yin WANG Xiao-dan CAI Yan-jiang 

机构地区：[1]School of Geographical Sciences,China West Normal University,Nanchong 637009,China [2]Xainza Alpine Steppe and Wetland Ecosystem Observation Station,Institute of Mountain Hazards and Environment,Chinese Academy of Sciences&Ministry of Water Resources,Chengdu 610041,China [3]College of Environmental and Resource Sciences,Zhejiang A&F University,Hangzhou 311300,China

出　　处：《Journal of Mountain Science》2022年第4期1156-1167,共12页山地科学学报（英文）

基　　金：supported by the National Natural Science Foundation of China (Grant NO. 41807109);the Second Tibetan Plateau Scientific Expedition and Research Program (Grant NO. 2019QZKK0404);the doctoral research launch fund project and National general cultivation project of China West Normal University (Grant NO. 17E042, 18B016)。

摘　　要：Yak(Bos grunniens) and Tibetan sheep urine deposited onto the alpine grasslands of the Qinghai-Tibetan Plateau is an important pathway for nutrient return, and it is closely related to soil fertility and alpine grassland productivity. However, hitherto, few studies have reported the effects of yak and Tibetan sheep urine deposition on soil carbon(C) and nitrogen(N) concentrations and the possible functional mechanisms under field conditions in alpine grasslands. To explore the status of soil C and N responding to the immediate N addition from livestock urine, we conducted a 28-d field experiment with three treatments, which include the application of yak urine(YU) and Tibetan sheep urine(TSU) application, and the control(CK, no application of urine). The results showed that YU treatment increased the soil moisture content and p H at 0-10 cm across the 28-day experimental period. Urine application resulted in the fluctuation of soil organic C(SOC) and increased topsoil SOC concentration during the middle and later periods of the experiment. Application of YU evidently increased the soil total N(TN) concentration in the 0-10 cm layer, while it did not affect the SOC concentrations in the 10-20 and 20-30 cm layers. Compared with the control, YU treatment significantly(P<0.05) increased the 0-10 and 10-20 cm soil ammonium-N(NH;-N) concentration throughout the 28 days, while the TSU treatment significantly(P<0.05) increased the 0-10 and 10-20 cm soil nitrate-N(NO;-N) concentration. Urine N input changed soil physicochemical properties, nitrification, denitrification, and N leaching processes, and therefore affected the availability of N accumulation and consumption in soil. Under these conditions, the trade-off between soil NH;-N and NO;-N under the influence of yak and Tibetan sheep urine application would change the form and concentration of available N, thereby altering the plant N uptake and utilization strategy of alpine grassland. The conclusions of this study could provide theoretical references for exploring t

关 键 词：Livestock urine Mineral nitrogen NITRIFICATION DENITRIFICATION Qinghai-Tibetan Plateau 

分 类 号：S812.2[农业科学—草业科学]