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Carbon dioxide emissions and sediment organic carbon burials across a gradient of trophic state in eleven New Zealand lakes

机译:十一个新西兰湖泊中营养状态梯度下的二氧化碳排放和沉积物有机碳埋葬

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摘要

Lakes are known to be important to the global carbon balance as they are both CO₂ sources to the atmosphere and also accumulate large amounts of carbon in their sediment. CO₂ flux dynamics across the air–water interface in 11 lakes of varying trophic state in the Rotorua region, New Zealand, derived from measured alkalinity, pH and wind speed at given temperature, showed that lakes may shift from being atmospheric CO₂ sources to sinks due to seasonal changes in phytoplankton productivity and lake mixing dynamics. Decreases in trophic state (i.e. improved water quality) in some of the lakes over the eight-year monitoring period were associated with increased surface water CO₂ concentrations and, as a consequence, increased CO₂ flux to the atmosphere. Organic carbon content analysis of the bottom sediments revealed that lakes with high phytoplankton productivity, indicated by high chlorophyll a biomass, generally had high rates of carbon deposition to the sediments, but not all deposited carbon was permanently buried. Remineralization of the organic carbon accrued in productive lakes may potentially generate CO₂, as well as CH₄, which promotes these lakes to act as greenhouse gas emitters.
机译:众所周知,湖泊对全球碳平衡很重要,因为它们既是大气中的CO2来源,又在其沉积物中积累了大量的碳。根据给定温度下测得的碱度,pH和风速,在新西兰罗托路亚地区11个营养状态不同的湖泊中,穿过水-水界面的CO 2通量动态表明,湖泊可能从大气中的CO 2来源转变为汇源。浮游植物生产力和湖泊混合动力的季节性变化。在为期八年的监测期内,某些湖泊的营养状态下降(即水质改善)与地表水CO 2浓度增加有关,结果,CO 2向大气的通量增加。对底部沉积物的有机碳含量分析表明,以高叶绿素a生物量表示的具有高浮游植物生产力的湖泊通常具有较高的碳沉积率,但并非所有沉积碳都被永久掩埋。生产性湖泊中累积的有机碳的再矿化可能会产生CO 2以及CH 3,从而促使这些湖泊充当温室气体排放者。

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