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首页> 外文期刊>Environmental Pollution >Even Low To Medium Nitrogen Deposition Impacts Vegetation Of Dry, Coastal Dunes Around The Baltic Sea
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Even Low To Medium Nitrogen Deposition Impacts Vegetation Of Dry, Coastal Dunes Around The Baltic Sea

机译:甚至低至中度的氮气沉积也会影响波罗的海周围干燥,沿海沙丘的植被

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摘要

Coastal dunes around the Baltic Sea have received small amounts of atmospheric nitrogen and are rather pristine ecosystems in this respect. In 19 investigated dune sites the atmospheric wet nitrogen deposition is 3-8 kg N ha~(-1) yr~(-1). The nitrogen content of Cladonia portentosa appeared to be a suitable bio-monitor of these low to medium deposition levels. Comparison with EMEP-deposition data showed that Cladonia reflects the deposition history of the last 3-6 years. With increasing nitrogen load, we observed a shift from lichen-rich short grass vegetation towards species-poor vegetation dominated by the tall graminoid Carex arenaria. Plant species richness per field site, however, does not decrease directly with these low to medium N deposition loads, but with change in vegetation composition. Critical loads for acidic, dry coastal dunes might be lower than previously thought, in the range of 4-6 kg N ha~(-1) yr~(-1) wet deposition.
机译:在这方面,波罗的海周围的沿海沙丘获得了少量的大气氮,是原始的生态系统。在19个被调查的沙丘站点中,大气湿氮沉积为3-8 kg N ha〜(-1)yr〜(-1)。刺柏的氮含量似乎是这些低至中等沉积水平的合适生物监测器。与EMEP沉积数据的比较表明,克拉德尼亚反映了过去3-6年的沉积历史。随着氮负荷的增加,我们观察到从富含地衣的短草植被向以高粒状类草Carex arenaria为主的物种贫乏的植被转变。但是,在这些低到中等的氮沉降量下,每个田地植物物种的丰富度并不会直接降低,而是随着植被组成的变化而降低。酸性,干燥沿海沙丘的临界负荷可能比以前认为的要低,在4-6 kg N ha〜(-1)yr〜(-1)湿沉降范围内。

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