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首页> 外文期刊>Geoderma: An International Journal of Soil Science >A direct link between forest vegetation type and soil organic matter composition
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A direct link between forest vegetation type and soil organic matter composition

机译：森林植被类型与土壤有机质组成之间的直接联系

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Total carbon storage and turnover in soils can be simulated as a series of pools with different turnover rates, ranging from seasonal to millennial. This approach has emphasized the importance of climatic controls on soil organic matter (SOM) dynamics, but implicitly assumes that SOM is minimally influenced by the nature of the plant material from which it is derived. Here we test this assumption by contrasting the influence of climate and vegetation (oak, manzanita, and conifers) on SOM composition in granitic-derived soils from California. Soils developed under the same climate in the San Gabriel Mountains were compared to soils with varying climate along an elevational transect in the Sierra Nevada range. Solid state TOSS CPMAS ~(13)C NMR was used to semiquantitatively characterize the chemical structure of organic matter in litter layers, and low-density and fine silt fractions isolated from sampled A horizons. For all soils, there was a progressive decrease in O-alkyl C, and an increase in alkyl and carbonyl C from the litter to the low-density and fine silt fractions. The NMR spectra of the low-density fractions, and even more so of the fine silt fractions exhibited clear differences in SOM composition associated with different plant genera, regardless of climate. The carbonyl C dominated under oak, O-alkyl C prevailed under manzanita, and alkyl C was prominent under coniferous vegetation. These results indicate that vegetation, not climate, was the factor controlling SOM composition in these soils, and should be taken as a caution against a simplistic climatic interpretation of storage and turnover rate of carbon in soils.
机译：土壤中的总碳存储量和周转率可以模拟为一系列不同的周转率池，范围从季节到千禧年。该方法强调了对土壤有机质（SOM）动力学进行气候控制的重要性，但隐含地假定SOM受其来源植物材料的性质影响最小。在这里，我们通过对比气候和植被（橡树，曼萨尼塔树和针叶树）对加州花岗岩来源土壤中SOM组成的影响来检验该假设。将圣加布里埃尔山在相同气候下发育的土壤与内华达山脉范围内高程横断面气候变化的土壤进行了比较。固态TOSS CPMAS〜（13）C NMR用于半定量表征垫料层中有机物的化学结构，以及从采样A层中分离出的低密度和细粉质组分。对于所有土壤，从凋落物到低密度和细粉尘部分，O-烷基碳逐渐减少，烷基和羰基碳增加。低密度级分的NMR谱图，甚至更多的细粉质级分的NMR谱图，显示出与不同植物属相关的SOM组成存在明显差异，而与气候无关。在橡树下，羰基碳占主导地位，在锰锌下占优势，O-烷基C占优势，在针叶植物中，烷基C占主导地位。这些结果表明，植被而不是气候是控制这些土壤中SOM组成的因素，因此应注意避免以简单的气候解释来解释土壤中碳的储存和周转率。

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