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Effects of Heavy Degradation on Alpine Meadows: Soil N 2 O Emission Rates and Meta-Analysis in the Tibetan Plateau

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  • Huidan He

    (College of Tourism, Resources and Environment, Zaozhuang University, Zaozhuang 277160, China
    Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining 810008, China)

  • Jingbin Zhu

    (College of Tourism, Resources and Environment, Zaozhuang University, Zaozhuang 277160, China
    Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining 810008, China)

  • Yangong Du

    (Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining 810008, China
    College of Geography, Qinghai Normal University, Xining 810001, China)

  • Jiapeng Qu

    (Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining 810008, China)

  • Chen Kelong

    (College of Geography, Qinghai Normal University, Xining 810001, China)

  • Huakun Zhou

    (Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining 810008, China)

Abstract

Heavy grassland degradation is evident across the Tibetan Plateau. However, atmospheric nitrous oxide (N 2 O) emission rates and their underlying driving mechanisms in the southeast regions and across the Tibetan Plateau remain unclear. We analyzed the N 2 O emission rates of heavily degraded and undegraded alpine meadow soil incubation using gas chromatography in three river sources and meta-analysis methods across the Tibetan Plateau. The N 2 O emission rates of the heavily degraded and control meadows were respectively 4.29 ± 0.64 and 3.27 ± 0.53 g kg −1 h −1 in the southeast Tibetan Plateau ( p < 0.01), indicating an increase of 31.16% on the N 2 O flux of heavy degradation. Heavy degradation increased N 2 O emission rates by 0.55 ± 0.14 (95% confidence interval: 0.27–0.83) through meta-analysis. High degradation increased by approximately 71.6% compared with that of the control. The water-filled pore space (WFPS) significantly influenced the N 2 O emission rate based on the moderator test ( p < 0.05). The mixed-effect model results revealed that WFPS, soil nitrate, and bulk soil could explain 59.90%, 16.56%, and 15.19% of the variation in the N 2 O emission rates between the control and heavily degraded meadows, respectively. In addition, the N 2 O emission rates of heavily degraded meadows can be reduced by increasing WFPS and bulk density, and by reducing the soil nitrate content.

Suggested Citation

  • Huidan He & Jingbin Zhu & Yangong Du & Jiapeng Qu & Chen Kelong & Huakun Zhou, 2022. "Effects of Heavy Degradation on Alpine Meadows: Soil N 2 O Emission Rates and Meta-Analysis in the Tibetan Plateau," Land, MDPI, vol. 11(8), pages 1-8, August.
    • Handle: RePEc:gam:jlands:v:11:y:2022:i:8:p:1255-:d:881730
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    References listed on IDEAS

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    1. Benjamin Wolf & Xunhua Zheng & Nicolas Brüggemann & Weiwei Chen & Michael Dannenmann & Xingguo Han & Mark A. Sutton & Honghui Wu & Zhisheng Yao & Klaus Butterbach-Bahl, 2010. "Grazing-induced reduction of natural nitrous oxide release from continental steppe," Nature, Nature, vol. 464(7290), pages 881-884, April.
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