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首页> 外文期刊>The Science of the Total Environment >Linking landscape heterogeneity with lake dissolved organic matter properties assessed through absorbance and fluorescence spectroscopy: Spatial and seasonal patterns in temperate lakes of Southern Andes (Patagonia, Argentina)
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Linking landscape heterogeneity with lake dissolved organic matter properties assessed through absorbance and fluorescence spectroscopy: Spatial and seasonal patterns in temperate lakes of Southern Andes (Patagonia, Argentina)

机译：通过吸收和荧光光谱法评估景观异质性与湖泊溶解有机物的性质：安第斯山脉南部温带湖泊（阿根廷巴塔哥尼亚）的空间和季节格局

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摘要

Hydrological connectivity between terrestrial and aquatic systems is influenced by landscape features. Topography. vegetation cover and type, lake morphometry and climate (seasonality, precipitation) drive the timing, concentration and quality of allochthonous dissolved organic matter (DOM) inputs to lakes, influencing lake metabolism. The impact of climate changes on terrestrial-aquatic linkages depends on regional trends and ecosystems properties. We examined how landscape heterogeneity affects lake DOM in pristine temperate headwater lakes located in sharp bioclimatic gradients at the leeward side of the southern Andes (Patagonia, Argentina), and predicted their potential responses to forecasted changes in regional climate. We assessed DOM properties of deep and shallow lakes spotted along precipitation and altitudinal gradients which reflect on vegetation heterogeneity. Lake DOM (concentration, and chromophoric and fluorescent properties) was related to terrestrial bioclimatic conditions, addressing also DOM bio- and photodegradation processes. Co-effects of climate and vegetation determined the quantity and quality of allochthonous DOM inputs. Higher terrestrial signs showed up at the wettest extreme of the gradient and during the rainy season, being attributable to higher hydrological land-water connectivity, and dense vegetation cover. Under drier conditions, DOM displayed higher photobleaching signs at spatial and temporal scales. The ratio between non-humic and terrestrial humic substances indicated that DOM biodegradation dominates in shallow forested lakes and photodegradation prevails in deep ones, whereas coupled photo- and biological processing shaped the DOM pool of high altitude lakes. Overall, DOM optical metrics captured landscape heterogeneity. Under the forecasted climate changes for Patagonia (decreasing precipitation and increasing temperature), piedmont lakes may experience lower hydrological connectivity, lower terrestrial inputs and, enhanced photobleaching usually associated with longer water residence time. In high altitude lakes, terrestrial DOM inputs are expected to increase due to the upward expansion of native deciduous forests, thus becoming more similar to lakes located lower in the landscape. (C) 2019 Elsevier B.V. All rights reserved.
机译：陆地和水生系统之间的水文连通性受景观特征的影响。地形。植被的覆盖度和类型，湖泊的形态和气候（季节性，降水）驱动着湖泊中异源溶解有机物（DOM）输入的时间，浓度和质量，影响了湖泊的新陈代谢。气候变化对陆地-水生联系的影响取决于区域趋势和生态系统特性。我们研究了景观异质性如何影响位于安第斯山脉南部（巴塔哥尼亚，阿根廷）背风侧的原始生物气候梯度的原始温带源头湖泊的DOM，并预测了它们对区域气候预测变化的潜在响应。我们评估了沿降水和海拔梯度发现的深，浅湖的DOM特性，反映了植被异质性。湖泊中的DOM（浓度，发色和荧光特性）与陆地生物气候条件有关，也解决了DOM的生物降解和光降解过程。气候和植被的共同影响决定了异源DOM输入的数量和质量。在坡度的最湿端和雨季，出现了更高的陆地标志，这归因于水文水陆连通性的提高以及植被的密集。在更干燥的条件下，DOM在时空尺度上显示出更高的光致漂白迹象。非腐殖质和陆地腐殖质之间的比率表明，在浅林湖中DOM的生物降解占主导，而在深林湖中的则主要发生光降解，而光合作用和生物加工共同作用形成了高海拔湖泊的DOM库。总体而言，DOM光学指标捕获了景观异质性。根据巴塔哥尼亚的预测气候变化（降水减少和温度升高），山前湖可能会经历较低的水文连通性，较低的地面投入以及通常与更长的水停留时间相关的光漂白作用。在高海拔湖泊中，由于原生落叶林的向上扩张，预计陆地DOM输入将增加，因此与景观较低的湖泊更加相似。 （C）2019 Elsevier B.V.保留所有权利。

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  • 来源
    《The Science of the Total Environment》 |2019年第10期|223-235|共13页
  • 作者

    Queimalinos Claudia; Reissig Mariana; Perez Gonzalo L.; Soto Cardenas Carolina; Gerea Marina; Garcia Patricia E.; Garcia Daniel; Dieguez Maria C.;

  • 作者单位

    Univ Nacl Comahue, CONICET, Inst Invest Biodiversidad & Medioambiente INIBIOM, GESAP Grp Ecol Sistemas Acuat Escala Paisaje, Quintral 1250, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina;

    Univ Nacl Comahue, CONICET, Inst Invest Biodiversidad & Medioambiente INIBIOM, GESAP Grp Ecol Sistemas Acuat Escala Paisaje, Quintral 1250, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina;

    Univ Nacl Comahue, CONICET, Inst Invest Biodiversidad & Medioambiente INIBIOM, GESAP Grp Ecol Sistemas Acuat Escala Paisaje, Quintral 1250, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina;

    Univ Nacl Comahue, CONICET, Inst Invest Biodiversidad & Medioambiente INIBIOM, GESAP Grp Ecol Sistemas Acuat Escala Paisaje, Quintral 1250, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina;

    Univ Nacl Comahue, CONICET, Inst Invest Biodiversidad & Medioambiente INIBIOM, GESAP Grp Ecol Sistemas Acuat Escala Paisaje, Quintral 1250, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina;

    Univ Nacl Comahue, CONICET, Inst Invest Biodiversidad & Medioambiente INIBIOM, GESAP Grp Ecol Sistemas Acuat Escala Paisaje, Quintral 1250, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina;

    Univ Nacl Comahue, CONICET, Inst Invest Biodiversidad & Medioambiente INIBIOM, GESAP Grp Ecol Sistemas Acuat Escala Paisaje, Quintral 1250, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina;

    Univ Nacl Comahue, CONICET, Inst Invest Biodiversidad & Medioambiente INIBIOM, GESAP Grp Ecol Sistemas Acuat Escala Paisaje, Quintral 1250, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina;

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  • 正文语种 eng
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  • 关键词

    Landscape heterogeneity; Lake dissolved organic matter; UV-visible and fluorescent spectroscopy; Climate seasonality; Allochthonous inputs; South temperate lakes;

    机译：景观异质性;湖溶解有机物;紫外线可见和荧光光谱;气候季节性;表发源性投入;南温带湖泊;

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