Reviews and syntheses: Understanding the impacts of peatland catchment management on dissolved organic matter concentration and treatability
Reviews and syntheses: Understanding the impacts of peatland catchment management on dissolved organic matter concentration and treatability
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DOI：
10.5194/bg-20-3751-2023
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发表时间：
2023-09
期刊：
影响因子：
4.9
通讯作者：
Jenny Williamson;Chris D. Evans;Bryan M. Spears;Amy Pickard;P. Chapman;H. Feuchtmayr;F. Leith;Susan Waldron;Don Monteith
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文献类型：
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作者：
Jenny Williamson;Chris D. Evans;Bryan M. Spears;Amy Pickard;P. Chapman;H. Feuchtmayr;F. Leith;Susan Waldron;Don Monteith
抽象。在英国，大多数为公共供水而建造的大型水库都位于高地地区。许多位于集水区，其特点是有机物丰富的土壤，包括泥炭地。尽管这些土壤自然地将大量的溶解性有机物（DOM）沥滤到水中，但英国高地泥炭的广泛退化被认为加剧了DOM的损失率。这些地区DOM浓度高且不断上升，给水处理行业带来了挑战。在英国，水务公司越来越多地考虑高地集水泥炭恢复措施是否可以减缓甚至逆转源水DOM浓度的上升，从而减少对更昂贵和复杂的工程解决方案的需求。这些措施的有效性仍存在很大的不确定性，而且仍然缺乏对这一领域研究的全面概述。在这里，我们回顾了同行评审的证据，在控制DOM从泥炭土释放的四个集水区管理方案的有效性：沟阻塞，植被重建，减少森林覆盖和停止管理燃烧。地块规模的调查结果的影响，沟渠阻塞DOM浸出目前在很大程度上是模棱两可的，而有一个更直接相关的水管理人员在空间尺度上的影响信息匮乏。有一些，虽然有限的证据表明，陆地植被类型可能会影响DOM的浓度和可处理性。泥炭土上的种植园林的存在通常与DOM浓度升高，虽然减少森林覆盖似乎没有什么短期效益，相关的干扰甚至可能进一步增加浓度。很少以下游水质为重点监测集水管理措施。为了减轻周围的不确定性恢复对DOM的影响，应采取措施，在特定的网站的基础上，规模，效果大小和干预的持续时间被认为是与随后发生在水库，水处理厂的处理能力和未来的DOM预测趋势的地球化学处理。
Abstract. In the UK, most large reservoirs constructed for public water supply are in upland areas. Many are situated in catchments characterised by organic-rich soils, including peatlands. Although these soils naturally leach large amounts of dissolved organic matter (DOM) to water, the widespread degradation of upland peat in the UK is believed to have exacerbated rates of DOM loss. High and rising DOM concentrations in these regions raise treatment challenges for the water industry. In the UK, water companies are increasingly considering whether upland-catchment peat restoration measures can slow down or even reverse rising source water DOM concentrations and, thus, reduce the need for more costly and complex engineering solutions. There remains considerable uncertainty around the effectiveness of such measures, and a comprehensive overview of the research in this area remains lacking. Here, we review the peer-reviewed evidence of the effectiveness of four catchment management options in controlling DOM release from peat soils: ditch blocking, revegetation, reducing forest cover and cessation of managed burning. Results of plot-scale investigations into the effects of ditch blocking on DOM leaching are currently largely equivocal, while there is a paucity of information regarding impacts at spatial scales of more direct relevance to water managers. There is some, although limited, evidence that the terrestrial vegetation type may influence DOM concentrations and treatability. The presence of plantation forestry on peat soils is generally associated with elevated DOM concentrations, although reducing forest cover appears to have little short-term benefit, and associated disturbance may even increase concentrations further. Catchment management measures have rarely been monitored with downstream water quality as the focus. To mitigate the uncertainty surrounding restoration effects on DOM, measures should be undertaken on a site-specific basis, where the scale, effect size and duration of the intervention are considered in relation to subsequent biogeochemical processing that occurs in the reservoir, the treatment capacity of the water treatment works and future projected DOM trends.