title: Effects of waterlogging on carbon assimilate partitioning in the Zoigê alpine wetlands revealed by 13CO2 pulse labeling.
abstract: Waterlogging has been suggested to affect carbon (C) turnover in wetlands, but how it affects C allocation and stocks remains unclear in alpine wetlands. Using in situ (13)CO2 pulse labelling, we investigated C allocation in both waterlogged and non-waterlogged sites in the Zoigê wetlands on the Tibetan Plateau in August 2011. More than 50% of total (13)C fixed by photosynthesis was lost via shoot respiration. Shoots recovered about 19% of total (13)C fixed by photosynthesis at both sites. Only about 26% of total fixed (13)C was translocated into the belowground pools. Soil organic C pool accounted for 19% and roots recovered about 5-7% of total fixed (13)C at both sites. Waterlogging significantly reduced soil respiration and very little (13)C was lost via soil respiration in the alpine wetlands compared to that in grasslands. We conclude that waterlogging did not significantly alter C allocations among the C pools except the (13)CO2 efflux derived from soil respiration and that shoots made similar contributions to C sequestration as the belowground parts in the Zoigê alpine wetlands. Therefore, changes in waterlogging due to climate change will not affect C assimilate partitioning but soil C efflux.
authors: School of Nature Conservation, Beijing Forestry University, Beijing 100083, China.
authors: Jun-Qin
authors: JQ
authors: Gao
authors: School of Nature Conservation, Beijing Forestry University, Beijing 100083, China.
authors: Ju-Juan
authors: JJ
authors: Gao
authors: School of Nature Conservation, Beijing Forestry University, Beijing 100083, China.
authors: Xue-Wen
authors: XW
authors: Zhang
authors: Key Laboratory of Ecosystem Network Observation and Modelling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China.
authors: Xing-Liang
authors: XL
authors: Xu
authors: School of Nature Conservation, Beijing Forestry University, Beijing 100083, China.
authors: Zhao-Heng
authors: ZH
authors: Deng
authors: School of Nature Conservation, Beijing Forestry University, Beijing 100083, China.
authors: Fei-Hai
authors: FH
authors: Yu
mesh_terms: D002244:Carbon; D002245:Carbon Dioxide; D002247:Carbon Isotopes; D017753:Ecosystem; D014867:Water; D053833:Wetlands
chemical_list: D002247:Carbon Isotopes; D014867:Water; D002245:Carbon Dioxide; D002244:Carbon