Seasonal and spatial variability of CO2 in aquatic environments of the central lowland Amazon basin.
Seasonal and spatial variability of CO2 in aquatic environments of the central lowland Amazon basin.
复制标题
亚马逊盆地中部低地水生环境中二氧化碳的季节和空间变化。
DOI：
10.1007/s10533-019-00554-9(01234567
复制
发表时间：
2019
期刊：
影响因子：
4
通讯作者：
Forsberg, B.R.
中科院分区：
文献类型：
--
作者：
Amaral, J.H.F.;Farjalla, V.F.;Melack, J.M.;Kasper, D.;Scofield, V.;Barbosa, P.M.;Forsberg, B.R.
在亚马逊河流域的河流和洪泛平原中，不同的来源和过程促成了CO2和CO2与大气的交换。我们测量或estimatedpCO 2，CO2通量与大气中，浮游生物群落呼吸（PCR），以及环境和景观变量沿着的黑人和亚马逊-Solimenes河流在不同时期的河流水文循环。在亚马逊-索利默勒盆地，二氧化碳分压的数值介于307至7527微大气压之间，而二氧化碳通量的数值介于− 9.3至1128 mmol m−2d− 1之间。在内格罗盆地，pCO 2值范围为648至6526 μatm，CO2通量范围为35至1025 mmol m−2d−1。在一个一般的线性模型，包括数据从内格罗和亚马逊-Solimonies盆地，季节和空间变化淹没植被栖息地面积，溶解氧，深度和水温解释85%的表面CO2变化。pCO 2随淹没范围的不同而变化，在水深和淹没面积较大、溶解氧浓度和水温较低的时期，pCO 2值较高。在一项单独的分析中，亚马逊-Solimaires河和洪泛平原，生态系统类型（激流或静水），水文周期，水温，溶解氧，深度和溶解磷解释了83%的pCO 2变化。我们的研究结果表明，冲积洪泛平原和季节性变化的湖沼特征的pCO 2水平的低地亚马逊河的河道的影响。
Different sources and processes contribute topCO2and CO2exchange with the atmosphere in the rivers and floodplains of the Amazon basin. We measured or estimatedpCO2, CO2fluxes with the atmosphere, planktonic community respiration (PCR), and environmental and landscape variables along the Negro and Amazon-Solimões rivers during different periods of the fluvial hydrological cycle. Values ofpCO2ranged from 307 to 7527 μatm, while CO2fluxes ranged from − 9.3 to 1128 mmol m−2d−1in the Amazon-Solimões basin. In the Negro basin,pCO2values ranged from 648 to 6526 μatm, and CO2fluxes from 35 to 1025 mmol m−2d−1. In a general linear model including data from Negro and Amazon-Solimões basins, seasonal and spatial variation in flooded vegetated habitat area, dissolved oxygen, depth and water temperature explained 85% of surfacepCO2variation. Levels ofpCO2varied with inundation extent, with higherpCO2values occurring in periods with greater water depth and inundation area, and lower dissolved oxygen concentrations and water temperatures. In a separate analysis for the Amazon-Solimões river and floodplains, ecosystem type (lotic or lentic), hydrological period, water temperature, dissolved oxygen, depth and dissolved phosphorus explained 83% ofpCO2variation. Our results demonstrate the influence of alluvial floodplains and seasonal variations in their limnological characteristics on thepCO2levels in river channels of the lowland Amazon.