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首页> 外文期刊>Aquatic Sciences >Evaluation of forest disturbance legacy effects on dissolved organic matter characteristics in streams at the Hubbard Brook Experimental Forest, New Hampshire
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Evaluation of forest disturbance legacy effects on dissolved organic matter characteristics in streams at the Hubbard Brook Experimental Forest, New Hampshire

机译：在新罕布什尔州的哈伯德布鲁克实验林中，评估森林干扰遗留对溪流中可溶性有机物特征的影响

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Dissolved organic matter (DOM) source and composition are critical drivers of its reactivity, impact microbial food webs and influence ecosystem functions. It is believed that DOM composition and abundance represent an integrated signal derived from the surrounding watershed. Recent studies have shown that land-use may have a long-term effect on DOM composition. Methods for characterizing DOM, such as those that measure the optical properties and size of the molecules, are increasingly recognized as valuable tools for assessing DOM sources, cycling, and reactivity. In this study we measured DOM optical properties and molecular weight determinations to evaluate whether the legacy of forest disturbance alters the amount and composition of stream DOM. Differences in DOM quantity and composition due to vegetation type and to a greater extent, wetland influence, were more pronounced than effects due to disturbance. Our results suggest that excitation-emission matrix fluorescence with parallel factor analysis is a more sensitive metric of disturbance than the other methods evaluated. Analyses showed that streams draining watersheds that have been clearcut had lower dissolved organic carbon (DOC) concentrations and higher microbially-derived and protein-like fluorescence features compared to reference streams. DOM optical properties in a watershed amended with calcium, were not significantly different than reference watersheds, but had higher concentrations of DOC. Collectively these results improve our understanding of how the legacy of forest disturbances and natural landscape characteristics affect the quantity and chemical composition of DOM in headwater streams, having implications for stream water quality and carbon cycling.
机译：溶解有机物（DOM）的来源和组成是其反应性，影响微生物食物网和影响生态系统功能的关键驱动因素。可以相信，DOM组成和丰度代表了来自周围流域的综合信号。最近的研究表明，土地利用可能会对DOM组成产生长期影响。表征DOM的方法（例如那些测量分子的光学性质和大小的方法）日益被认为是评估DOM来源，循环和反应性的有价值的工具。在这项研究中，我们测量了DOM的光学性质和分子量，以评估森林干扰的遗留是否会改变河流DOM的数量和组成。与植被造成的影响相比，由于植被类型和更大程度地受湿地影响，DOM数量和组成的差异更为明显。我们的结果表明，与其他评估方法相比，采用并行因子分析的激发发射矩阵荧光是更敏感的干扰度量。分析表明，与参考水流相比，已被清除的排水流域的水具有较低的溶解有机碳（DOC）浓度和较高的微生物来源和类似蛋白质的荧光特征。用钙修正的分水岭中的DOM光学性质与参考分水岭没有显着差异，但DOC浓度较高。总的来说，这些结果使我们更加了解森林干扰和自然景观特征如何影响源头溪流中DOM的数量和化学成分，并对溪流水质和碳循环产生影响。

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