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首页> 外文期刊>Hydrology and Earth System Sciences Discussions >Contrasting transit times of water from peatlands and eucalypt forests in the Australian Alps determined by tritium: implications for vulnerability and the source of water in upland catchments
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Contrasting transit times of water from peatlands and eucalypt forests in the Australian Alps determined by tritium: implications for vulnerability and the source of water in upland catchments

机译：由tri确定的来自澳大利亚阿尔卑斯山泥炭地和桉树林的水的运输时间的对比：对脆弱性和高地流域水源的影响

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pstrongAbstract./strong Peatlands are a distinctive and important component of many upland regions that commonly contain distinctive flora and fauna which are different from those of adjacent forests and grasslands. Peatlands also represent a significant long-term store of organic carbon. While their environmental importance has long since been recognised, water transit times within peatlands are not well understood. This study uses tritium (sup3/supH) to estimate the mean transit times of water from peatlands and from adjacent gullies that contain eucalypt forests in the Victorian Alps (Australia). The sup3/supH activities of the peatland water range from 2.7 to 3.3 tritium units (TUs), which overlap the measured (2.9 to 3.0??TU) and expected (2.8 to 3.2??TU) average sup3/supH activities of rainfall in this region. Even accounting for seasonal recharge by rainfall with higher sup3/supH activities, the mean transit times of the peatland waters are??&span class="thinspace"/span6.5??years and may be less than 2??years. Water from adjacent eucalypt forest streams has sup3/supH activities of 1.6 to 2.1??TU, implying much longer mean transit times of 5 to 29??years. Cationspan class="thinspace"/spana??span class="thinspace"/spanCl and Sispan class="thinspace"/spana??span class="thinspace"/spanCl ratios are higher in the eucalypt forest streams than the peatland waters and both of these water stores have higher cationspan class="thinspace"/spana??span class="thinspace"/spanCl and Sispan class="thinspace"/spana??span class="thinspace"/spanCl ratios than rainfall. The major ion geochemistry reflects the degree of silicate weathering in these catchments that is controlled by both transit times and aquifer lithology. The short transit times imply that, unlike the eucalypt forests, the peatlands do not represent a long-lived store of water for the local river systems. Additionally, the peatlands are susceptible to drying out during drought, which renders them vulnerable to damage by the periodic bushfires that occur in this region./p.
机译：> >摘要。泥炭地是许多山地地区的独特而重要的组成部分，这些地区通常包含与邻近森林和草原不同的动植物。泥炭地也代表着重要的长期有机碳存储。尽管人们早就认识到它们对环境的重要性，但人们对泥炭地内水的运输时间却知之甚少。这项研究使用tri（ 3 H）估算了来自维多利亚州阿尔卑斯山（澳大利亚）的泥炭地和相邻的含桉树林的沟壑的水的平均迁移时间。泥炭地水的 3 H活性范围为2.7至3.3 units单位，与实测平均值（2.9至3.0？TU）和预期平均值（2.8至3.2？TU）重叠<该地区降雨的sup> 3 H活动。即使考虑到具有较高 3 H活动的降雨的季节性补给，泥炭地水域的平均过境时间为≤＆ class =“ thinspace”> 6.5？年和可能少于2？年。来自相邻桉树林流的水的 3 H活度为1.6至2.1？TU，这意味着5至29年的平均渡越时间更长。阳离子 class =“ thinspace”> a ?? class =“ thinspace”> Cl和Si class =“ thinspace”> a ?? class = “桉树森林溪流中的thinspace“> Cl比率高于泥炭地水域，并且这两个水库中的阳离子含量都较高。 class =” thinspace“> a ?? class =” Thinspace“> Cl和Si class =” thinspace“> a ?? class =” thinspace“> Cl的比值比降雨高。主要的离子地球化学反应反映了这些流域中硅酸盐的风化程度，其受迁移时间和含水层岩性的控制。短暂的运输时间意味着，与桉树林不同，泥炭地并不代表当地河流系统的长寿水库。此外，泥炭地在干旱期间很容易变干，这使其容易受到该地区周期性林区大火的破坏。。

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