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Quantifying actual evapotranspiration in fen ecosystems: Implications of management and vegetation structure
Ecohydrology & Hydrobiology ( IF 2.7 ) Pub Date : 2020-05-25 , DOI: 10.1016/j.ecohyd.2020.04.001
Sate Ahmad , Georg Hörmann , Nada Zantout , Joachim Schrautzer

Alkaline fens are ecosystems with extraordinarily high biodiversity. However, they belong to the most threatened ecosystems in Europe due to drainage, land use intensification and cessation of traditional management. In such systems, evapotranspiration (ET) is an important hydrological process as it is the principal way of water loss. However, there is a knowledge gap concerning the effect of vegetation structure and management on this process. Thus, we quantify actual ET rate based on diurnal groundwater fluctuation in different vegetation and management types (forested, only-mowed, mowed/cleared) as well as analyze the differences in vegetation composition. We utilize medium-term, high frequency hydrological data from an alkaline fen in northern Germany as well as data on floral species composition and light availability. Our results show that ET rates are similar in the mowed fen with tree clearance (cleared/mowed fen) and in the only-mowed fen. The only-mowed fen has significantly higher ET rates compared to the alder carr and one part of the willow forest. Similarly the cleared/mowed fen also had significantly higher ET rates than those in the alder carr. Although the results are not entirely consistent with those of other authors, few studies support our findings. We conclude that the difference we observe may be caused by differences in microclimate such as lower temperature and wind speed and higher humidity in the forest, compared to the open fens. Species composition was significantly different between the forested fen and the cleared fen.



中文翻译:

量化生态系统中的实际蒸散量:管理和植被结构的含义

碱性是具有极高生物多样性的生态系统。但是,由于排水,土地使用集约化和停止传统管理,它们属于欧洲受威胁最大的生态系统。在这样的系统中,蒸散量(ET)是重要的水文过程,因为它是失水的主要方式。但是,关于植被结构和管理对这一过程的影响存在知识差距。因此,我们根据不同植被和管理类型(森林,仅割草,割草/清除)的每日地下水波动来量化实际ET率,并分析植被组成的差异。我们利用来自德国北部碱的中期,高频水文数据,以及花卉种类组成和光照利用率的数据。我们的结果表明,在有树木清除率的被清除的中(清除/被修剪的)和仅被修剪的中的ET率相似。与the木和柳林的一部分相比,唯一被割的具有较高的ET率。同样,清除/修剪的也比the木卡尔的ET率高得多。尽管结果与其他作者并不完全一致,但很少有研究支持我们的发现。我们得出的结论是,与开阔的compared相比,我们观察到的差异可能是由于小气候的差异所致,例如森林中较低的温度和风速以及较高的湿度。森林和清除的之间的物种组成明显不同。与the木和柳林的一部分相比,唯一被割的具有较高的ET率。同样,清除/修剪的也比the木卡尔的ET率高得多。尽管结果与其他作者并不完全一致,但很少有研究支持我们的发现。我们得出的结论是,与开阔的compared相比,我们观察到的差异可能是由于微气候的差异所致,例如森林中较低的温度和风速以及较高的湿度。森林和清除的之间的物种组成明显不同。与the木和一部分柳树相比,唯一被修剪的具有较高的ET率。同样,清除/修剪的也比the木卡尔的ET率高得多。尽管结果与其他作者并不完全一致,但很少有研究支持我们的发现。我们得出的结论是,与开阔的compared相比,我们观察到的差异可能是由于微气候的差异所致,例如森林中较低的温度和风速以及较高的湿度。森林和清除的之间的物种组成明显不同。尽管结果与其他作者并不完全一致,但很少有研究支持我们的发现。我们得出的结论是,与开阔的compared相比,我们观察到的差异可能是由于微气候的差异所致,例如森林中较低的温度和风速以及较高的湿度。森林和清除的之间的物种组成明显不同。尽管结果与其他作者并不完全一致,但很少有研究支持我们的发现。我们得出的结论是,与开阔的compared相比,我们观察到的差异可能是由于微气候的差异所致,例如森林中较低的温度和风速以及较高的湿度。森林和清除的之间的物种组成明显不同。

更新日期:2020-05-25
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