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首页> 外文期刊>Agricultural and Forest Meteorology >Why is marsh productivity so high? New insights from eddy covariance and biomass measurements in a Typha marsh
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Why is marsh productivity so high? New insights from eddy covariance and biomass measurements in a Typha marsh

机译：为什么沼泽生产力如此之高？香蒲沼泽中涡度协方差和生物量测量的新见解

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Researchers have a poor understanding of the mechanisms that allow freshwater marshes to achieve rates of net primary production (NPP) that are higher than those reported for most other types of ecosystems. We used an 8-year record of the gross primary production (GPP) and NPP at the San Joaquin Freshwater Marsh (SJFM) in Southern California to determine the relative importance of GPP and carbon use efficiency (CUE; the ratio of total NPP to GPP calculated as NPP GPP(-1)) in determining marsh NPP. GPP was calculated from continuous eddy covariance measurements and NPP was calculated from annual harvests. The NPP at the SJFM was typical of highly productive freshwater marshes, while the GPP was similar to that reported for other ecosystem types, including some with comparatively low NPPs. NPP was weakly related to GPP in the same year, and was better correlated with the GPP summed from late in the previous year's growing season to early in the current growing season. This lag was attributed to carbohydrate reserves, which supplement carbon for new leaf growth in the early growing season of the current year. The CUE at the SJFM for the 8-year period was 0.61 +/- 0.05. This CUE is larger than that reported for tropical, temperate, and boreal ecosystems, and indicates that high marsh NPP is attributable to a high CUE and not a high GPP. This study underscores the importance of autotrophic respiration and carbon allocation in determining marsh NPP. Published by Elsevier B.V.
机译：研究人员对允许淡水沼泽实现净初级生产力（NPP）的机制了解甚少，净初级生产力（NPP）高于大多数其他类型的生态系统所报告的净初级生产力。我们使用南加州圣华金淡水沼泽（SJFM）的8年初级生产总值（NP）和NPP记录来确定GPP和碳使用效率（CUE; NPP与GPP的比率）的相对重要性。在确定沼泽NPP时计算为NPP GPP（-1））。 GPP是从连续涡动协方差测量得出的，而NPP是从年度收获中得出的。 SJFM的NPP是高产淡水沼泽的典型特征，而GPP与其他生态系统类型（包括某些NPP相对较低）的报道相似。 NPP在同一年与GPP的关系较弱，并且与GPP的相关性更好，从前一年的生长季节后期到当前生长季节的早期相加。造成这种滞后的原因是碳水化合物的储备，碳水化合物储备补充了碳，以补充当年早期生长季节新叶片的生长。 SJFM在8年期间的CUE为0.61 +/- 0.05。该CUE大于热带，温带和北方生态系统的报告CUE，表明沼泽高NPP归因于高CUE而不是高GPP。这项研究强调了自养呼吸和碳分配在确定沼泽NPP中的重要性。由Elsevier B.V.发布

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