Differential Effects of Oxidised and Reduced Nitrogen on Vegetation and Soil Chemistry of Species-Rich Acidic Grasslands
Differential Effects of Oxidised and Reduced Nitrogen on Vegetation and Soil Chemistry of Species-Rich Acidic Grasslands
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氧化氮和还原氮对物种丰富的酸性草原植被和土壤化学的不同影响
DOI：
10.1007/s11270-013-1664-4
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
R. Bobbink
中科院分区：
文献类型：
--
作者：
E. Dorland;C. Stevens;C. Gaudnik;E. Corcket;S. Rotthier;K. Wotherspoon;Mari Jokerud;V. Vandvik;M. Soons;M. Hefting;P. Aarrestad;D. Alard;M. Diekmann;C. Dupré;N. Dise;D. Gowing;R. Bobbink
自20世纪50年代以来，氨和氮氧化物的排放和沉积急剧增加。这导致了欧洲许多具有高保护价值的生态系统中氮循环、植被组成和植物多样性的显著变化。由于不同的区域污染水平和在不久的将来减少N的重要性增加，确定不同形式的N的影响是了解大气N输入后果的重要任务。我们在挪威、威尔士和法国大西洋生物地理区域的一个气候梯度的物种丰富的酸性草地上进行了三个重复的氮添加实验，这些草地的污染水平较低。N以两种剂量（0和70 kg N / ha−1年−1以上背景）和三种形式（氧化N、还原N和50-50组合）添加。在施氮2.5年后，测定了各处理对植物生物量、植物营养状况、土壤pH值和土壤养分有效性的影响。在2.5年的研究期内观察了氮添加的影响。在某些情况下，N形式的差异效应的最初迹象也可以被证明。例如，在法国样地，氧化N处理显著增加了草生物量，但减少了N处理。在挪威试验点，还本施氮显著降低了土壤pH值，而氧化施氮则没有。还观察了对养分有效性的影响。这些试验将继续阐明氮沉降对这些草原的长期影响。
Emissions and deposition of ammonia and nitrogen oxides have strongly increased since the 1950s. This has led to significant changes in the nitrogen (N) cycle, vegetation composition and plant diversity in many ecosystems of high conservation value in Europe. As a consequence of different regional pollution levels and of the increased importance of reduced N in the near future, determining the effect of different forms of N is an important task for understanding the consequences of atmospheric N inputs. We have initiated three replicated N addition experiments in species-rich, acidic grasslands spanning a climatic gradient in the Atlantic biogeographic region of Europe in Norway, Wales and France at sites with low levels of pollution. N was added in two doses (0 and 70 kg N ha−1 year−1 above background) and in three forms (oxidised N, reduced N and a 50–50 combination). After 2.5 years of N additions, the effects of these treatments on plant biomass, plant nutritional status, soil pH and soil nutrient availability were determined. Impacts of the N additions were observed within the 2.5-year research period. In some cases, the first signs of differential effects of N form could also be demonstrated. In the French site, for example, grass biomass was significantly increased by the oxidised N treatments but decreased by the reduced N treatments. In the Norwegian site, the reduced N treatments significantly reduced soil pH, whereas oxidised N did not. Effects on nutrient availability were also observed. These experiments will be continued to elucidate the longer term impacts of N deposition on these grasslands.
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影响因子：
8.9
作者：
C. Stevens;C. Dupré;E. Dorland;C. Gaudnik;D. Gowing;A. Bleeker;M. Diekmann;D. Alard;R. Bobbink;D. Fowler;E. Corcket;J. Mountford;V. Vandvik;P. Aarrestad;S. Muller;N. Dise
通讯作者：
C. Stevens;C. Dupré;E. Dorland;C. Gaudnik;D. Gowing;A. Bleeker;M. Diekmann;D. Alard;R. Bobbink;D. Fowler;E. Corcket;J. Mountford;V. Vandvik;P. Aarrestad;S. Muller;N. Dise
影响因子：
9.4
作者：
Arroniz-Crespo, Maria;Leake, Jonathan R.;Phoenix, Gareth K.
通讯作者：
Phoenix, Gareth K.
影响因子：
8.9
作者：
L.J.L. van den Berg;C.J.H. Peters;Mike Ashmore;J. Roelofs
通讯作者：
L.J.L. van den Berg;C.J.H. Peters;Mike Ashmore;J. Roelofs
影响因子：
11.6
作者：
Dupre, Cecilia;Stevens, Carly J.;Diekmann, Martin
通讯作者：
Diekmann, Martin