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首页> 外文期刊>Plant and Soil >Effects of elevated atmospheric CO and tropospheric O on nutrient dynamics: decomposition of leaf litter in trembling aspen and paper birch communities
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Effects of elevated atmospheric CO and tropospheric O on nutrient dynamics: decomposition of leaf litter in trembling aspen and paper birch communities

机译：大气CO和对流层O浓度升高对养分动态的影响：发抖的白杨和白桦群落中凋落物的分解

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Atmospheric changes could strongly influence how terrestrial ecosystems function by altering nutrient cycling. We examined how the dynamics of nutrient release from leaf litter responded to two important atmospheric changes: rising atmospheric CO and tropospheric O. We evaluated the independent and combined effects of these gases on foliar litter nutrient dynamics in aspen (Populus tremuloides Michx) and birch (Betula papyrifera Marsh)/aspen communities at the Aspen FACE Project in Rhinelander, WI. Naturally senesced leaf litter was incubated in litter bags in the field for 735 days. Decomposing litter was sampled six times during incubation and was analyzed for carbon, and both macro (N, P, K, S, Ca, and Mg) and micro (Mn, B, Zn and Cu) nutrient concentrations. Elevated CO significantly decreased the initial litter concentrations of N (-10.7%) and B (-14.4%), and increased the concentrations of K (+23.7%) and P (+19.7%), with no change in the other elements. Elevated O significantly decreased the initial litter concentrations of P (-11.2%), S (-8.1%), Ca (-12.1%), and Zn (-19.5%), with no change in the other elements. Pairing concentration data with litterfall data, we estimated that elevated CO significantly increased the fluxes to soil of all nutrients: N (+12.5%), P (+61.0%), K (+67.1%), S (+28.0%), and Mg (+40.7%), Ca (+44.0%), Cu (+38.9%), Mn (+62.8%), and Zn (+33.1%). Elevated O had the opposite effect: N (-22.4%), P (-25.4%), K (-27.2%), S (-23.6%), Ca (-27.6%), Mg (-21.7%), B (-16.2%), Cu (-20.8%), and Zn (-31.6%). The relative release rates of the nine elements during the incubation was: K >= P >= mass >= Mg >= B >= Ca >= S >= N >= Mn >= Cu >= Zn. Atmospheric changes had little effect on nutrient release rates, except for decreasing Ca and B release under elevated CO and decreasing N and Ca release under elevated O. We conclude that elevated CO and elevated O will alter nutrient cycling more through effects on litter production, rather than litter nutrient concentrations or release rates.
机译：大气变化可能通过改变养分循环而强烈影响陆地生态系统的功能。我们研究了叶片凋落物中养分释放的动力学如何响应两个重要的大气变化：大气中CO和对流层O的上升。我们评估了这些气体对白杨（Populus tremuloides Michx）和桦树（Populus tremuloides Michx）叶凋落物养分动力学的独立和综合影响。威斯康星州莱茵兰德市的Aspen FACE项目的桦木（Betula papyrifera Marsh）/阿彭社区。将自然衰老的叶子凋落物在野外的垃圾袋中孵育735天。在孵化过程中，对分解的垃圾进行了六次采样，并分析了碳以及宏观（N，P，K，S，Ca和Mg）和微量（Mn，B，Zn和Cu）养分浓度。升高的CO显着降低了初始凋落物N（-10.7％）和B（-14.4％）的浓度，增加了K（+ 23.7％）和P（+ 19.7％）的浓度，其他元素没有变化。升高的O会显着降低P（-11.2％），S（-8.1％），Ca（-12.1％）和Zn（-19.5％）的初始凋落物浓度，其他元素没有变化。将浓度数据与凋落物数据配对，我们估计，升高的CO会显着增加所有养分向土壤的通量：N（+12.5％），P（+61.0％），K（+67.1％），S（+ 28.0％）， Mg（+40.7％），Ca（+44.0％），Cu（+38.9％），Mn（+ 62.8％）和Zn（+ 33.1％）。升高的O具有相反的作用：N（-22.4％），P（-25.4％），K（-27.2％），S（-23.6％），Ca（-27.6％），Mg（-21.7％），B （-16.2％），Cu（-20.8％）和Zn（-31.6％）。孵育期间九种元素的相对释放速率为：K> = P> =质量> = Mg> = B> = Ca> = S> = N> = Mn> = Cu> = Zn。大气变化对养分释放速率几乎没有影响，除了在CO升高时减少Ca和B的释放以及在O升高时减少N和Ca的释放。我们得出结论，CO升高和O升高将通过对产仔量的影响而更多地改变养分循环。比凋落物的养分浓度或释放率高。

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