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首页> 外文期刊>Scandinavian Journal of Forest Research >Soil respiration during freeze-thaw cycles in a temperate Korean Larch (Larix olgensis herry.) plantation
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Soil respiration during freeze-thaw cycles in a temperate Korean Larch (Larix olgensis herry.) plantation

机译：温带落叶松（Larix olgensis赫里）人工林在冻融循环过程中的土壤呼吸

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摘要

Successive effects of freeze-thaw cycles (FTCs) on soil respiration rate (Rs) were explored in a Korean Larch (Larix olgensis Herry.) plantation during the winter to spring season. In March 2014, laboratory incubation with severe FTCs at the extreme minimum temperatures of -16 degrees C and mild FTCs (-8 degrees C) and field-based methods through five days continuous measurements of Rs at eight time points in one day were applied to determine the diurnal and seasonal Rs variations during FTCs, and to analyze the effects of FTCs regimes on Rs. The Rs increased rapidly as thawing proceeded, generating two peaks during severe FTCs, but with no obvious CO2 peaks in mild FTCs or field-based measurements. In severe FTCs, the Rs in first three FTCs changed dramatically, subsequently tended to stabilize. The diurnal Rs dynamics both followed unimodal type, with no fixed peak in laboratory study but the maximum value at 14:00 in field study. Laboratory- and field-based FTCs studies both highlighted the significant effects on soil carbon release. Initial response of soil respiratory bursts during early FTCs appeared to be driven by extreme minimum temperatures, while response of soil carbon release in late cycles was controlled by reduction in soil organic matter during early cycles.
机译：在冬季至春季，在韩国落叶松（Larix olgensis Herry。）人工林中探索了冻融循环（FTC）对土壤呼吸速率（Rs）的连续影响。 2014年3月，采用了在-16°C的极低最低温度下使用重度FTC和轻度FTCs（-8℃）进行实验室温育的方法，以及在一天中的八个时间点连续五天连续测量Rs的基于现场的方法。确定FTC期间的每日和季节性Rs变化，并分析FTC体制对Rs的影响。随着解冻过程的进行，Rs迅速增加，在严重的FTC中产生了两个峰，但在温和的FTC或基于现场的测量中没有明显的CO2峰。在严重的FTC中，前三个FTC的Rs发生了巨大变化，随后趋于稳定。昼夜Rs动力学都遵循单峰形式，在实验室研究中没有固定的峰值，但在野外研究中最大的值为14:00。基于实验室和实地FTC的研究都强调了对土壤碳释放的显着影响。早期FTC期间土壤呼吸爆发的初始响应似乎受极端最低温度的驱动，而后期循环中土壤碳释放的响应则受早期循环中土壤有机质的减少控制。

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