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首页> 外文期刊>Ecological research >Gross primary productivity of phytoplankton and planktonic respiration in inland flood plain wetlands of southeast Australia: habitat-dependent patterns and regulating processes
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Gross primary productivity of phytoplankton and planktonic respiration in inland flood plain wetlands of southeast Australia: habitat-dependent patterns and regulating processes

机译：澳大利亚东南部内陆洪泛平原湿地浮游植物和浮游呼吸的总初级生产力：与生境有关的模式和调控过程

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摘要

Gross primary productivity (GPP) of phytoplankton and planktonic respiration (PR) (i.e., planktonic metabolism) are critical pathways for carbon transformation in many aquatic ecosystems. In inland floodplain wetlands with variable inundation regimes, quantitative measurements of GPP and PR are rare and their relationships with wetland environmental conditions are largely unknown. We measured PR and the GPP of phytoplankton using light and dark biological oxygen demand bottles in open waters of channel and non-channel floodplain habitats of inland floodplain wetlands of southeast Australia that had been inundated by environmental water. Overall, GPP varied from 3.7 to 405.5 mg C m~(-3) h~(-1) (mean ± standard error: 89.4 ± 9.2 mg C m~(-3) h~(-1), n = 81), PR from 1.5 to 251.6 mg Cm~(-3)h~(-1) (43.2 ± 5.6 mg C m~(-3) h~(-1), n = 81), and GPP/PR from 0.2 to 15.6 (3.0 ± 0.3, n = 81). In terms of wetland environmental conditions, total nitrogen (TN) ranged from 682.0 to 14,700.0 mg m~(-3) (mean ± standard error: 2,643.0 ± 241.6 mg m~(-3) , n = 81), total phosphorus (TP) from 48.0 to 1,405.0 mg m~(-3) (316.8 ±31.4 mg m~(-3), n = 81), and dissolved organic carbon (DOC) from 1.9 to 46.3 gm~(-3) (22.0 ± 1.6 g m~(-3), n = 81). Using ordinary least-squares multiple regression analyses, the rates of GPP and PR, and their ratio (GPP/PR) were modeled as a function of TN, TP, and DOC that had been measured concomitantly. The "best" models predicted GPP and GPP/PR ratio in channel habitats as a function of DOC; and GPP, PR, and GPP/PR in non-channel floodplain habitats as a function of TN and/or TP. The models explained between 46 and 74 % of the variance in channel habitats and between 17 and 87 % of the variance in non-channel floodplain habitats. Net autotrophy (mean GPP/PR 3.0) of planktonic metabolism in our work supports the prevailing view that wetlands are a net sink for carbon dioxide. We propose a nutrient-DOC framework, combined with hydrological and geomorphological delineations, to better predict and understand the planktonic metabolism in inland floodplain wetlands.
机译：浮游植物的总初级生产力（GPP）和浮游呼吸（PR）（即浮游代谢）是许多水生生态系统中碳转化的关键途径。在具有多种淹没方式的内陆洪泛区湿地中，GPP和PR的定量测量很少见，并且它们与湿地环境条件的关系在很大程度上还不清楚。我们使用浅色和深色生物需氧量瓶在被澳大利亚东南部内陆洪泛区湿地的河道和非河道洪泛区生境的开阔水域中被环境水淹没的情况下，测量了浮游植物的PR和GPP。总体而言，GPP从3.7到405.5 mg C m〜（-3）h〜（-1）变化（平均值±标准误差：89.4±9.2 mg C m〜（-3）h〜（-1），n = 81） ，PR从1.5至251.6 mg Cm〜（-3）h〜（-1）（43.2±5.6 mg C m〜（-3）h〜（-1），n = 81），GPP / PR从0.2至15.6（3.0±0.3，n = 81）。就湿地环境条件而言，总氮（TN）为682.0至14,700.0 mg m〜（-3）（平均值±标准误差：2,643.0±241.6 mg m〜（-3），n = 81），总磷（TP ）从48.0到1,405.0 mg m〜（-3）（316.8±31.4 mg m〜（-3），n = 81），溶解有机碳（DOC）从1.9到46.3 gm〜（-3）（22.0±1.6） gm〜（-3），n = 81）。使用普通最小二乘多元回归分析，将GPP和PR的比率及其比率（GPP / PR）建模为已同时测量的TN，TP和DOC的函数。 “最佳”模型根据DOC预测通道栖息地的GPP和GPP / PR比率；非通道洪泛区生境中的GPP，PR和GPP / PR与TN和/或TP的关系。该模型解释了河道生境中46％至74％的变化以及非河道洪泛区生境中17％至87％的变化。在我们的工作中，浮游代谢的净自养能力（平均GPP / PR 3.0）支持一种普遍的观点，即湿地是二氧化碳的净汇。我们提出了一个营养-DOC框架，结合水文和地貌描述，以更好地预测和了解内陆洪泛区湿地的浮游代谢。

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