文章基本信息

标题：Vliv akumulace dusíku na vřesoviště a suché trávníky v Národním parku Podyjí
其他标题：The Effect of Nitrogen Accumulation on Heathlands and Dry Grasslands in the české Podyjí National Park
本地全文：下载
作者：Jaroslav Záhora ; Milan Chytrý ; Petr Holub 等
期刊名称：Životné prostredie
印刷版ISSN：0044-4863
电子版ISSN：2585-7800
出版年度：2016
卷号：50
期号：2
页码：97-107
出版社：Institute of Landscape Ecology of the Slovak Academy of Sciences
摘要：The increasing availability of soil mineral nitrogen is often considered as a cause of expansion of nitrogen-demanding tall grasses into oligotrophic species-rich heathlands and dry grasslands dominated by Festuca ovina. Consequently these ecosystems tend to lose their biodiversity. This paper summarizes the main results of diffrent studies focused on the soil nitrogen transformation and availability in the heathlands and dry grasslands in the Podyjí National Park (southern Czech Republic). Increasing soil mineral nitrogen availability accelerates expansion of competitive tall grasses Calamagrostis epigejos and Arrhenatherum elatius there. Subsequently, due to higher plant and microbial demands for soil mineral nitrogen, the soil nitrogen availability in the tall-grass sites decreases. At the same time, experimental addition of carbon in the form of cellulose into dry grassland decreased nitrogen availability, which indicates that such ecosystem needs more carbon to effctively use the current levels of available soil nitrogen. Substantial diffrences between A. elatius a C. epigejos were found in their capability to (i) accumulate nitrogen in plant tissues, (ii) resorb nitrogen from above-ground biomass during senescence and (iii) release nitrogen from plant littr during decomposition. These observations point out to diffrent growth and nutrient use strategies of the studied grass species and associated microbial communities in the rhizosphere.
关键词：Arrhenatherum elatius; atmospheric nitrogen deposition; Calluna vulgaris; Calamagrostis epigejos; Festuca ovina; soil; české Podyji National Park