An ecological and methodological assessment of benthic gross primary production in northern lakes
An ecological and methodological assessment of benthic gross primary production in northern lakes
复制标题
北部湖泊底栖总初级生产力的生态和方法学评估
DOI：
10.1002/ecs2.3973
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发表时间：
2022
期刊：
影响因子：
2.7
通讯作者：
J. Ask
中科院分区：
文献类型：
--
作者：
I. Puts;A. Bergström;H. Verheijen;S. Norman;J. Ask
底栖总初级生产力（GPP）通常是北部湖泊水生食物网中最重要的部分，由于全球变化，北部湖泊正在逐渐变暖并接受增加的陆地有色溶解有机碳负荷。然而，海底 GPP 的测量相当不常见，海底 GPP 的方法和单位尺寸不标准化，也很少进行比较。在这项研究中，我们测量了瑞典北部三个地区 27 个源头湖泊的底栖 GPP，并分析了离散深度底栖 GPPzrate 的潜在约束驱动因素，以及整个湖泊以及沿岸带的底栖 GPP 平均值的估计。我们还将整个湖底栖 GPP 平均值的现场测量值与使用“自养结构模型”的建模值进行了比较。我们发现，底栖 GPPzrate 最好由可用光（即深度和水色的函数）和温度来解释，并且与可用光呈正相关。相反，整个湖泊的底栖 GPP 平均值最好通过沿岸区域的相对大小来解释，这是一种结合了湖泊测深和水色的衡量标准。全湖底栖GPP平均值的原位测量值和模型估计值之间的比较表明，（1）与测量数据相比，自养结构模型在低值时低估了GPP，在高值时高估了GPP；（2）测量值与温度有关，而温度并未作为变量包含在自养结构模型中。考虑到未来预测的变化对北纬湖泊的影响，我们的结果表明，湖水温度的升高可以在一定程度上减轻湖泊褐变导致的光可用性减少对底栖 GPPzrate 的负面影响。这些变化对整个湖泊的底栖 GPP 平均值的综合影响将取决于确定沿岸区域相对大小的湖泊测深，并受到湖泊测深的调节。
Benthic gross primary production (GPP) is often the most important part of aquatic food webs in northern lakes, which are gradually warming and receiving increased terrestrial colored dissolved organic carbon loadings due to global change. Yet, measurements of benthic GPP are fairly uncommon, and methods and unit dimensions of benthic GPP are unstandardized and rarely compared. In this study, we measured benthic GPP in 27 headwater lakes from three regions in northern Sweden and analyzed potential constraining drivers of benthic GPPzrates at discrete depths and estimates of benthic GPP averages across the whole lake, as well as across the littoral zone. We also compared in situ measurements of benthic GPP averages across the whole lake with modeled values using the “autotrophic structuring model.” We found that benthic GPPzrates were best explained by, and positively related to, available light (i.e., a function of depth and water color) and temperature. Benthic GPP averages across the whole lake, on the contrary, were best explained by the relative size of the littoral area, which is a measure that combines lake bathymetry and water color. The comparison between in situ measured and modeled estimates of benthic GPP averages across the whole lake revealed that (1) the autotrophic structuring model underestimates GPP at low values and overestimates GPP at high values compared with measured data, and that (2) measured values were related to temperature, which is not included as a variable in the autotrophic structuring model. Considering future predicted changes impacting northern latitude lakes, our results suggest that increased lake water temperatures can to some extent mitigate the negative impacts of reduced light availability from lake browning on benthic GPPzrates. The combined impact of these changes on benthic GPP averages across the whole lake will depend on, and be moderated by, lake bathymetry determining the relative size of the littoral area.
影响因子：
5.2
作者：
O'Reilly, Catherine M.;Sharma, Sapna;Zhang, Guoqing
通讯作者：
Zhang, Guoqing