Carbon pools and fluxes in a Tibetan alpine Kobresia pygmaea pasture partitioned by coupled eddy-covariance measurements and 13CO2 pulse labeling

被引:28
|
作者
Ingrisch, Johannes [1 ]
Biermann, Tobias [2 ]
Seeber, Elke [3 ]
Leipold, Thomas [2 ]
Li, Maoshan [4 ]
Ma, Yaoming [5 ]
Xu, Xingliang [6 ]
Miehe, Georg [7 ]
Guggenberger, Georg [8 ]
Foken, Thomas [2 ,9 ]
Kuzyakov, Yakov [10 ,11 ,12 ]
机构
[1] Univ Bayreuth, Dept Agroecosyst Res, Bayreuth, Germany
[2] Univ Bayreuth, Dept Micrometeorol, Bayreuth, Germany
[3] Senckenberg Museum Nat Hist, Gorlitz, Germany
[4] Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, Lanzhou, Peoples R China
[5] Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Tibetan Environm Changes & Land Surface P, Beijing, Peoples R China
[6] Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing, Peoples R China
[7] Univ Marburg, Fac Geog, Marburg, Germany
[8] Leibniz Univ Hannover, Inst Soil Sci, D-30167 Hannover, Germany
[9] Bayreuth Ctr Ecol & Ecosystem Res BayCEER, Bayreuth, Germany
[10] Univ Gottingen, Dept Soil Sci Temperate Ecosyst, D-37073 Gottingen, Germany
[11] Univ Gottingen, Dept Agr Soil Sci, D-37073 Gottingen, Germany
[12] Kazan Fed Univ, Inst Environm Sci, Kazan, Russia
关键词
Alpine grassland; Carbon cycle; Land use changes; Grazing; Tibetan-Plateau; ECOSYSTEM CO2 EXCHANGE; RANGELAND DEGRADATION; ASSIMILATED CARBON; MEADOW ECOSYSTEM; DIOXIDE EXCHANGE; SOIL; PLATEAU; QINGHAI; GRASSLAND; CHINA;
D O I
10.1016/j.scitotenv.2014.10.082
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The Tibetan highlands host the largest alpine grassland ecosystems worldwide, bearing soils that store substantial stocks of carbon (C) that are very sensitive to land use changes. This study focuses on the cycling of photoassimilated C within a Kobresia pygmaea pasture, the dominating ecosystems on the Tibetan highlands. We investigated short-term effects of grazing cessation and the role of the characteristic Kobresia root turf on C fluxes and belowground C turnover. By combining eddy-covariance measurements with (CO2)-C-13 pulse labeling we applied a powerful new approach to measure absolute fluxes of assimilates within and between various pools of the plant-soil-atmosphere system. The roots and soil each store roughly 50% of the overall C in the system (76 Mg Cha(-1)), with only a minor contribution from shoots, which is also expressed in the root:shoot ratio of 90. During June and July the pasture acted as a weak C sink with a strong uptake of approximately 2 g C m(-2) d(-1) in the first half of July. The root turf was the main compartment for the turnover of photoassimilates, with a subset of highly dynamic roots (mean residence time 20 days), and plays a key role for the C cycling and C storage in this ecosystem. The short-term grazing cessation only affected aboveground biomass but not ecosystem scale C exchange or assimilate allocation into roots and soil. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码:1213 / 1224
页数:12
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