Responses of carbon transfer, partitioning, and residence time to land use in the plant–soil system of an alpine meadow on the Qinghai-Tibetan Plateau

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• 作者：Liang Zhao ; Dongdong Chen ; Na Zhao ; Qi Li ; Qian Cheng…
• 关键词：Qinghai ; Tibetan Plateau ; Alpine meadow ; Land use ; Carbon transfer ; 13C pulse labeling
• 刊名：Biology and Fertility of Soils
• 出版年：2015
• 出版时间：October 2015
• 年：2015
• 卷：51
• 期：7
• 页码：781-790
• 全文大小：948 KB
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  Lundegardh H (1
• 作者单位：Liang Zhao (1)
  Dongdong Chen (1)
  Na Zhao (1)
  Qi Li (1)
  Qian Cheng (2)
  Caiyun Luo (1)
  Shixiao Xu (1)
  Shiping Wang (3)
  Xinquan Zhao (1)
  
  1. Key Laboratory of Adaptation and Evolution of Plateau Biota, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, 81001, China
  2. Qinghai Normal University, Xining, 81001, China
  3. Institute Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, 100085, China
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Life Sciences
  Agriculture
  Soil Science and Conservation
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-0789

文摘

We conducted an in situ 13C pulse-labeling experiment from July to September 2011, involving three land use types: native alpine meadow with winter grazing (native meadow), cultivated perennial Elymus nutans (perennial grass), and annual Avena sativa (annual grass) pastures in the Qinghai-Tibetan Plateau. Thirty-two days after labeling, 32, 23, and 43 % of recovered 13C of native meadow, perennial grass, and annual grass, respectively, were released by shoot respiration, and 43, 34, and 22 % were allocated to belowground C pools. About half of 13C allocated to belowground C pools was released by soil respiration. Mean residence time of net assimilate C in this ecosystem was 67, 118, and 43 days for native meadow, perennial grass, and annual grass, respectively. Our results imply that species abundance and root/shoot ratio are the major controlling factors of soil C stocks in high-altitude grassland ecosystems, explaining 35 and 73 %, respectively. We suggest that conversion to monoculture for food production on the Qinghai-Tibetan Plateau may deteriorate soil health through rapid loss of soil organic C. The main cause of C transfer reduction after conversion to monoculture is the change in species richness and root/shoot ratio. Together with previous research studies, our results also support the finding that moderate grazing benefits grassland C transfer and stock, owing to higher species richness and root/shoot ratio. Keywords Qinghai-Tibetan Plateau Alpine meadow Land use Carbon transfer 13C pulse labeling