Effects of N addition on soil organic carbon components in an alpine meadow on the eastern Qinghai-Tibetan Plateau

High soil organic carbon content, extensive root biomass, and low nutrient availability make alpine grasslands an important ecosystem for assessing the influence of nutrient enrichment on soil respiration (SR). We conducted a four-year (2009–2012) field experiment in an alpine grassland on the Qinghai-Tibetan Plateau to examine the individual and combined effects of nitrogen (N, 100 kg ha−1year−1) and phosphorus (P, 50 kg ha−1year−1) addition on SR. We found that both N and P addition did not affect the overall growing-season SR but effects varied by year: with N addition SR increased in the first year but decreased during the last two years. However, while P addition did not affect SR during the first two years, SR increased during the last two years. No interactive effects of N and P addition were observed, and both N addition and P addition reduced heterotrophic respiration during the last year of the experiment. N and P addition affected SR via different processes: N mainly affected heterotrophic respiration, whereas P largely influenced autotrophic respiration. Our results highlight the divergent effects of N and P addition on SR and address the important potential of P enrichment for regulating SR and the carbon balance in alpine grasslands.

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Contrasting effects of nitrogen and phosphorus addition on soil respiration in an alpine grassland on the Qinghai-Tibetan Plateau

Ren

Yang

Zhou

et al. 2016

Sci Rep

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Effects of Simulated NH₄⁺Deposition on CO₂Fluxes in the Hulun Buir Meadow Steppe of Inner Mongolia, China

Liu¹,

Zhang

et al. 2015

Journal of Resources and Ecology

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Effects of N addition on soil organic carbon components in an alpine meadow on the eastern Qinghai-Tibetan Plateau

Abstract: 不同施氮处理下 0-10cm、10-20cm、20-30cm 土壤中粗颗粒态有机碳(CPOC) 、细颗粒态有机碳(FPOC) 和矿质结合有机碳 (MOC) 含量,研究不同施氮类型(NH 4 Cl,(NH 4) 2 SO 4 和 KNO 3) 和施氮水平(0、10、20、40 kgN•hm-2 •a-1) 对土壤 POC 和 MOC 含

Cited by 2 publications

References 26 publications

Contrasting effects of nitrogen and phosphorus addition on soil respiration in an alpine grassland on the Qinghai-Tibetan Plateau

Contrasting effects of nitrogen and phosphorus addition on soil respiration in an alpine grassland on the Qinghai-Tibetan Plateau

Effects of Simulated NH₄⁺Deposition on CO₂Fluxes in the Hulun Buir Meadow Steppe of Inner Mongolia, China

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Effects of N addition on soil organic carbon components in an alpine meadow on the eastern Qinghai-Tibetan Plateau

Cited by 2 publications

References 26 publications

Contrasting effects of nitrogen and phosphorus addition on soil respiration in an alpine grassland on the Qinghai-Tibetan Plateau

Contrasting effects of nitrogen and phosphorus addition on soil respiration in an alpine grassland on the Qinghai-Tibetan Plateau

Effects of Simulated NH4+Deposition on CO2Fluxes in the Hulun Buir Meadow Steppe of Inner Mongolia, China

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Effects of Simulated NH₄⁺Deposition on CO₂Fluxes in the Hulun Buir Meadow Steppe of Inner Mongolia, China