Reduced nitrogen has a greater effect than oxidised nitrogen on dry heathland vegetation.
Reduced nitrogen has a greater effect than oxidised nitrogen on dry heathland vegetation.
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DOI：
10.1016/j.envpol.2007.11.027
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发表时间：
2008-08
影响因子：
8.9
通讯作者：
L.J.L. van den Berg;C.J.H. Peters;Mike Ashmore;J. Roelofs
中科院分区：
文献类型：
--
作者：
L.J.L. van den Berg;C.J.H. Peters;Mike Ashmore;J. Roelofs
我们研究了不同比例的还原（NH 4+）与氧化（NO3−）氮的沉积在石楠和物种丰富的草原植被在高氮沉降水平的大型围隔填充营养贫乏的土壤，不同的NH 4 +/NO3−比例施加的影响。记录了杂类草、异株山金车、龙胆、绢毛藓、草、曲叶发草、狭角草和灌木Calluna vulgaris的反应。该草A. dioica和草D.decumbens偏好低NH 4 +/NO3−比率，并且其特征在于NH 4 +/NO3−比率与生物量和存活率之间的负相关，而草N. stricta和D. flexuosa与NH 4 +/NO3−比值没有相关性。石灰的加入消除了高浓度NH 4+对A. dioica和草D.卧倒。这些研究结果石楠植被的影响进行了讨论。
We investigated the effects of different ratios of reduced (NH4+) versus oxidised (NO3−) nitrogen in deposition on heathland and species-rich grassland vegetation at high nitrogen deposition levels in large mesocosms filled with nutrient-poor soils to which different NH4+/NO3−ratios were applied. The response of the forbs, Antennaria dioica, Arnica montana, Gentiana pneumonanthe, Thymus serpyllum, the grasses Danthonia decumbens, Deschampsia flexuosa, Nardus stricta and the shrub Calluna vulgaris was recorded. The forb A. dioica and the grass D.decumbens preferred low NH4+/NO3−ratios and were characterised by a negative correlation between NH4+/NO3−ratios and biomass and survival, whereas the grasses N. stricta and D. flexuosa showed no correlation with NH4+/NO3−ratios. Lime addition eliminated the negative effects of high NH4+concentrations in deposition for A. dioica and the grass D. decumbens. The implications of these findings for heathland vegetations are discussed.