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首页> 外文期刊>Soil Biology & Biochemistry >Labile, recalcitrant, and microbial carbon and nitrogen pools of a tallgrass prairie soil in the US Great Plains subjected to experimental warming and clipping
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Labile, recalcitrant, and microbial carbon and nitrogen pools of a tallgrass prairie soil in the US Great Plains subjected to experimental warming and clipping

机译：美国大平原高草草原土壤的不稳定，顽固和微生物碳和氮库经过实验性增温和剪裁

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摘要

Carbon (C) and nitrogen (N) fluxes are largely controlled by the small but highly bio-reactive, labile pools of these elements in terrestrial soils, while long-term C and N storage is determined by the long-lived recalcitrant fractions. Changes in the size of these pools and redistribution among them in response to global warming may considerably affect the long-term terrestrial C and N storage. However, such changes have not been carefully examined in field warming experiments. This study used sulfuric acid hydrolysis to quantify changes in labile and recalcitrant C and N fractions of soil in a tallgrass prairie ecosystem that had been continuously warmed with or without clipping for about 2.5 years. Warming significantly increased labile C and N fractions in the unclipped plots, resulting in increments of 373 mg C kg super(-1) dry soil and 15 mg N kg super(-1) dry soil, over this period whilst clipping significantly decreased such concentrations in the warmed plots. Warming also significantly increased soil microbial biomass C and N in the unclipped plots, and increased ratios of soil microbial/labile C and N, indicating an increase in microbial C- and N-use efficiency. Recalcitrant and total C and N contents were not significantly affected by warming. For all measured pools, only labile and microbial biomass C fractions showed significant interactions between warming and clipping, indicating the dependence of the warming effects on clipping. Our results suggest that increased soil labile and microbial C and N fractions likely resulted indirectly from warming increases in plant biomass input, which may be larger than warming-enhanced decomposition of labile organic compounds.
机译：碳（C）和氮（N）的通量很大程度上受陆地土壤中这些元素的小但高度生物反应性不稳定的池控制，而长期C和N的储存则取决于长期顽固的馏分。这些池的大小变化以及响应全球变暖而在它们之间的重新分配可能会极大地影响陆地的长期C和N储存。但是，这种变化尚未在野外升温实验中仔细检查过。这项研究使用硫酸水解来量化高草草原生态系统中不稳定和顽固的土壤C和N组分的变化，该生态系统经过持续加热（有或没有修剪约2.5年）。在这段时间内，变暖显着增加了未修剪样地中不稳定的C和N分数，导致增加了373 mg C kg超级（-1）干燥土壤和15 mg N kg超级（-1）干燥土壤，同时削减显着降低了此类浓度在温暖的土地上。变暖还显着增加了未修剪土地的土壤微生物生物量碳和氮，并增加了土壤微生物/不稳定碳和氮的比率，表明微生物对碳和氮的利用效率有所提高。变暖对顽固性和总C，N含量没有显着影响。对于所有测得的库，只有不稳定和微生物生物质C馏分显示变暖和削波之间存在显着的相互作用，表明变暖效应对削波的依赖性。我们的结果表明，土壤不稳定和微生物碳和氮组分的增加可能是由于植物生物量输入的升温导致的，这可能比升温增强的不稳定有机化合物的分解更大。

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