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Shift in soil-plant nitrogen dynamics of an alpine-nival ecotone

机译：高山-新生过渡带土壤植物氮素动态变化

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摘要

We investigated the nitrogen (N) dynamics of an alpine-nival ecotone on Mt. Schrankogel, Tyrol, Austria, in relation to temperature. Natural abundance of super(15)N was used as a tool to elucidate differences in N cycling along an altitudinal transect ranging from 2,906 to 3,079 m, corresponding to a gradient in mean annual temperature of 2.4 degree C. The amount of total soil N, of plant available N and soil C/N ratio decreased significantly with increasing altitude, whereas soil pH increased. Soil delta super(15)N decreased with increasing altitude from +2.2 to -2.1ppt and delta super(15)N of plant tissues (roots and leaves) decreased from -3.7 to -5.5ppt. The large shift in soil delta super(15)N of 4.3ppt from the lowest to the highest site suggested substantial differences in N cycling in alpine and nival ecosystems in the alpine nival ecotone investigated. We concluded that N cycling at the alpine-nival ecotone is likely to be controlled by various factors: temperature, soil age and development, atmospheric N deposition and plant competition. Our results furthermore demonstrate that the alpine-nival ecotone may serve as a sensitive indicator of global change.
机译：我们研究了山上高山-冬季过渡带的氮（N）动态。 Schrankogel，蒂罗尔，奥地利，关于温度。 super（15）N的自然丰度被用作阐明氮在沿着2906到3079 m的高海拔样带的循环中的差异的工具，相当于年平均温度为2.4摄氏度的梯度。海拔高度显着降低了植物有效氮含量和土壤碳氮比，而土壤pH值升高。随着高度的增加，土壤δsuper（15）N从+2.2下降到-2.1ppt，植物组织（根和叶）的delta super（15）N从-3.7下降到-5.5ppt。从最低点到最高点，土壤δsuper（15）N的变化很大，为4.3ppt，这表明在所研究的高山生态交错带中，高山生态系统和氮生态系统的氮循环存在很大差异。我们得出的结论是，高山-新生代过渡带的氮素循环可能受多种因素控制：温度，土壤年龄和发育，大气氮素沉积和植物竞争。我们的研究结果进一步表明，高山-冬季过渡带可能是全球变化的敏感指标。

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