Abstract
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.
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Acknowledgments
This work was financially supported by the “Strategic Priority Research Program” of the Chinese Academy of Sciences (XDA05070000), the Key Program of National Natural Science Foundation of China (41030105), the Key Project of Qinghai Province (No. 2011-Z-734 and 2013-Z-941Q), and the National Key Technologies R&D Program (2014BAC05B04). We gratefully acknowledge Xingliang Xu for his help in the field sampling work of the study.
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Zhao, L., Chen, D., Zhao, N. et al. 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. Biol Fertil Soils 51, 781–790 (2015). https://doi.org/10.1007/s00374-015-1024-1
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DOI: https://doi.org/10.1007/s00374-015-1024-1