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Greenhouse Gas Emissions from the Tibetan Alpine Grassland: Effects of Nitrogen and Phosphorus Addition

Author

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  • Guangshuai Wang

    (Key Laboratory of Crop Water Use and Regulation of Ministry of Agriculture and Rural Affairs, Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China
    Key Laboratory of Adaptation and Evolution of Plateau Biota, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining 810008, China
    These authors contributed equally to this work.)

  • Yueping Liang

    (Key Laboratory of Crop Water Use and Regulation of Ministry of Agriculture and Rural Affairs, Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China
    These authors contributed equally to this work.)

  • Fei Ren

    (Key Laboratory of Adaptation and Evolution of Plateau Biota, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining 810008, China
    State Key Laboratory of Plateau Ecology and Agriculture, Qinghai University, Xining 810016, China)

  • Xiaoxia Yang

    (Key Laboratory of Adaptation and Evolution of Plateau Biota, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining 810008, China
    State Key Laboratory of Plateau Ecology and Agriculture, Qinghai University, Xining 810016, China)

  • Zhaorong Mi

    (Key Laboratory of Adaptation and Evolution of Plateau Biota, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining 810008, China
    School of Horticulture Architecture, Henan Institute of Science and Technology, Xinxiang 453003, China)

  • Yang Gao

    (Key Laboratory of Crop Water Use and Regulation of Ministry of Agriculture and Rural Affairs, Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China)

  • Timothy S. George

    (The James Hutton Institute, Dundee DD2 5DA, Scotland, UK)

  • Zhenhua Zhang

    (Key Laboratory of Adaptation and Evolution of Plateau Biota, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining 810008, China)

Abstract

The cycle of key nutrient elements nitrogen (N) and phosphorus (P) has been massively altered by anthropogenic activities. Little is known about the impacts on greenhouse gas (GHG) emission of the large nutrient additions occurring in the alpine grasslands of the Tibetan Plateau. We investigated soil surface emissions of carbon dioxide (CO 2 ), methane (CH 4 ) and nitrous oxide (N 2 O) under control, N, P and combined nitrogen and phosphorus (NP) additions from July 2011 to September 2012. Compared to the control, CO 2 flux significantly increased by 14.6% and 27.4% following P and NP addition, respectively. The interaction of NP addition had a significant influence on CO 2 flux during the non-growing season and the spring thaw period. Compared to the control, CH 4 flux decreased by 9.9%, 23.2% and 26.7% following N, P and NP additions, respectively, and no interactive effect of NP addition was found in any period. Soil N 2 O flux was significantly increased 2.6 fold and 3.3 fold, following N and NP addition treatments, respectively, and there was no interaction effect of NP addition together. The contribution of cumulative CO 2 emission during the non-growing season was less than 20% of the annual budget, but cumulative CH 4 and N 2 O emissions during the same period can account for 37.3–48.9% and 44.7–59.5% of the annual budget, respectively. Methane and N 2 O emissions did not increase greatly during the spring thawing period, with contributions of only 0.4–3.6% and 10.3–12.3% of the annual budget, respectively. Our results suggest that N and P addition could increase CO 2 and N 2 O emissions and reduce CH 4 emission. Furthermore, although the non-growing season is very cold and long, cumulative CH 4 and N 2 O emissions are considerable during this period and cannot be neglected by future studies evaluating the greenhouse gas emission budget in the Tibetan plateau.

Suggested Citation

  • Guangshuai Wang & Yueping Liang & Fei Ren & Xiaoxia Yang & Zhaorong Mi & Yang Gao & Timothy S. George & Zhenhua Zhang, 2018. "Greenhouse Gas Emissions from the Tibetan Alpine Grassland: Effects of Nitrogen and Phosphorus Addition," Sustainability, MDPI, vol. 10(12), pages 1-17, November.
    • Handle: RePEc:gam:jsusta:v:10:y:2018:i:12:p:4454-:d:185993
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