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@ARTICLE{Chen:16353,
      author       = {Chen, W. and Wolf, B. and Zheng, X. and Yao, Z. and
                      Butterbach-Bahl, K. and Brüggemann, N. and Liu, C. and Han,
                      S. and Han, X.},
      title        = {{A}nnual methane uptake by temperate semiarid steppes as
                      regulated by stocking rates, aboveground plant biomass and
                      topsoil air permeability},
      journal      = {Global change biology},
      volume       = {17},
      issn         = {1354-1013},
      address      = {Oxford [u.a.]},
      publisher    = {Wiley-Blackwell},
      reportid     = {PreJuSER-16353},
      pages        = {2803 - 2816},
      year         = {2011},
      note         = {This work was supported by the Chinese Ministry of Science
                      and Technology (2010CB951801), the German Research
                      Foundation (Research Unit No. 536, MAGIM) and the National
                      Natural Science Foundation of China (41021004, 40805061).
                      Additional support was provided by the Helmholtz-CSC (China
                      Scholarship Council) program and the Helmholtz-CAS joint
                      laboratory project (ENTRANCE). We are grateful to the staff
                      of IAP, IB, IMKIFU, and MAGIM for their support in field
                      experiments.},
      abstract     = {Overgrazing-induced degradation of temperate semiarid
                      steppes may affect the soil sink for atmospheric methane
                      (CH4). However, previous studies have primarily focused on
                      the growing season and on single grazing patterns. Thus, the
                      response of annual CH4 uptake by steppes compared with
                      various grazing practices is uncertain. In this study, we
                      investigated the effects of grazing on the annual CH4 uptake
                      by two typical Eurasian semiarid steppes (the Stipa grandis
                      steppe and the Leymus chinensis steppe) located in Inner
                      Mongolia, China. The CH4 fluxes were measured year-round
                      using static chambers and gas chromatography at 12 field
                      sites that differed primarily in grazing intensities. Our
                      results indicated that steppe soils were CH4 sinks
                      throughout the year. The annual CH4 uptake correlated with
                      stocking rates, whereas the seasonality of CH4 uptake was
                      primarily dominated by temperature. The annual CH4 uptake at
                      all sites averaged 3.7±0.7 kg C ha−1 yr−1
                      (range: 2.3–4.5), where approximately $35\%$ (range:
                      $23–40\%)$ occurred during the nongrowing season.
                      Light-to-moderate grazing (stocking
                      rate≤1 sheep ha−1 yr−1) did not significantly
                      change the annual CH4 uptake compared with ungrazed steppes,
                      but heavy grazing reduced annual CH4 uptake significantly
                      (by $24–31\%,$ P<0.05). These findings imply that easing
                      the pressure of heavily grazed steppes (e.g. moving to light
                      or moderate stocking rates) would help restore steppe soil
                      sinks for atmospheric CH4. The empirical equations based on
                      the significant relationships between annual CH4 uptake and
                      stocking rates, aboveground plant biomass and topsoil air
                      permeability (P<0.01) could provide simple approaches for
                      the estimation of regional CH4 uptake by temperate semiarid
                      steppes.},
      cin          = {IBG-3},
      ddc          = {570},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {Terrestrische Umwelt},
      pid          = {G:(DE-Juel1)FUEK407},
      shelfmark    = {Biodiversity Conservation / Ecology / Environmental
                      Sciences},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000293399000003},
      doi          = {10.1111/j.1365-2486.2011.02444.x},
      url          = {https://juser.fz-juelich.de/record/16353},
}