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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

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Journal of Mountain Science 2022年第4期19卷 1156-1167页

作者： DU Zi-yin WANG Xiao-dan CAI Yan-jiang School of Geographical Sciences China West Normal UniversityNanchong 637009China xainza alpine steppe and wetland ecosystem observation station Institute of Mountain Hazards and EnvironmentChinese Academy of Sciences&Ministry of Water ResourcesChengdu 610041China College of Environmental and Resource Sciences Zhejiang A&F UniversityHangzhou 311300China

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(Palpine grassland. The conclusions of this study coul

关键词： Livestock urine Mineral nitrogen Nitrification Denitrification Qinghai-Tibetan Plateau

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Dynamics of Above-and Below-ground Biomass and C,N,P Accumulation in the alpine steppe of Northern Tibet

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Journal of Mountain Science 2011年第6期8卷 838-844页

作者： LU Xuyang YAN Yan FAN Jihui CAO Yingzi WANG Xiaodan Key Laboratory of Mountain Environment Evolvement and Regulation Institute of Mountain Hazards and Environment CAS Chengdu 610o41 China Shenzha alpine steppe and wetland ecosystem observation and Experiment station Institute of Mountain Hazards and Environment CAS Shenzha 85310o China

The temporal dynamics of the biomass, as well as the carbon （C）, nitrogen （N）, phosphorus （P） concentrations and accumulation contents, in above- and below-ground vegetation components were determined in the alpine steppe vegetation of Northern Tibet during the growing season of 2OLO. The highest levels of total biomass （311.68 g m-2）, total C （115.95 g m-2）, total N （2.60 g m-2）, and total P （0.90 g m-2） accumulation contents were obtained in August in 2010. Further, biomass and nutrient stocks in the below-ground components were higher than those of the above-ground components. The dominant species viz., Stipa purpurea and Carex moorcrofli had lower biomass and C, N, P accumulations than the companion species which including Oxytropis. spp., Artemisia capillaris Thunb., Aster tataricus L., and SO on.

关键词： Biomass Nutrient concentration Nutrient accumulation alpine steppe Northern Tibet

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