CO2 exchange of a temperate fen during the conversion from moderately rewetting to flooding

CO2 exchange of a temperate fen during the conversion from moderately rewetting to flooding
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从适度再润湿到淹没过程中温度分界的 CO2 交换

DOI:
10.1002/jgrg.20069
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发表时间:
2013
期刊:
Journal of Geophysical Research: Biogeosciences
影响因子:
--
通讯作者:
Jurasinski G
Jurasinski G
中科院分区:
--
文献类型:
--
作者:
Koebsch F;Glatzel S;Hofmann J;Forbrich I;Jurasinski G

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全年洪水提供了一种常见的土地管理实践,以重建排水泥炭地的天然二氧化碳(CO2)汇功能。在这里,我们提出了涡动协方差测量的净CO2交换从温带沼泽在连续三个生长季节(5月至10月),跨越一段时间的转换,从适度再湿润到洪水。当我们在2009年开始测量时,水文条件代表了过去20年的平均生长季节水位(MWGL)为0 cm,但夏季水位要低得多。洪水开始于2010年,MWGL高于地表36厘米。在整个生长季节,沼泽都是一个净CO2汇(2009年:−333.3 ± 12.3,2010年:−294.1 ± 8.4,2011年:−352.4 ± 5.1 g C m−2),但冠层光合作用(CP)和生态系统呼吸(Reco)的幅度明显不同。CP和Reco率在洪水前很高,在2010年分别下降了46%和61%,但在2011年生长季节开始时再次上升,直到6月和7月水位开始进一步上升。我们假设,洪水不仅减少CO2释放,由于在厌氧条件下抑制Reco,但CO2封存率也收缩,由于减少CP。我们的结论是,回湿可能作为一个干扰的植物群落,已经适应了干燥的条件下,经过几十年的排水。然而,如果最近的物种仍然丰富,CP和自养Reco的上升,可以预期植物已经制定了塑料应对策略,潮湿的条件下。
Year‐round flooding provides a common land management practice to reestablish the natural carbon dioxide (CO2) sink function of drained peatlands. Here we present eddy covariance measurements of net CO2exchange from a temperate fen during three consecutive growing seasons (May–October) that span a period of conversion from moderately rewetting to flooding. When we started our measurements in 2009, the hydrological conditions were representative for the preceding 20 years with a mean growing season water level (MWGL) of 0 cm but considerably lower water levels in summer. Flooding began in 2010 with an MWGL of 36 cm above the surface. The fen was a net CO2sink throughout all growing seasons (2009: −333.3 ± 12.3, 2010: −294.1 ± 8.4, 2011: −352.4 ± 5.1 g C m−2), but magnitudes of canopy photosynthesis (CP) and ecosystem respiration (Reco) differed distinctively. Rates of CP and Reco were high before flooding, dropped by 46% and 61%, respectively, in 2010, but increased again during the beginning of growing season 2011 until the water level started to rise further due to strong rainfalls during June and July. We assume that flooding decreases not only the CO2release due to inhibited Reco under anaerobic conditions but also CO2sequestration rates are constricted due to decreased CP. We conclude that rewetting might act as a disturbance for a plant community that has adapted to drier conditions after decades of drainage. However, if the recent species are still abundant, a rise in CP and autotrophic Reco can be expected after plants have developed plastic response strategies to wetter conditions.
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