增温对土壤有机碳矿化的影响研究综述
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湿润亚热带山地生态国家重点实验室培育基地,福建师范大学地理研究所;湿润亚热带山地生态国家重点实验室培育基地,福建师范大学地理研究所;湿润亚热带山地生态国家重点实验室培育基地,福建师范大学地理研究所;湿润亚热带山地生态国家重点实验室培育基地,福建师范大学地理研究所;湿润亚热带山地生态国家重点实验室培育基地,福建师范大学

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国家重大科学研究计划课题(2014CB954003);国家自然科学基金(31500408);国家自然科学基金(31500407)


Effects of warming on soil organic carbon mineralization: A review
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State Key Laboratory of Humid Subtropical Mountain Ecology,,,,,Fujian Normal University

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    摘要:

    全球变暖的大背景下,土壤作为陆地生态系统中最大碳汇的载体,其微小变化都会引起大气CO2浓度显著的改变。土壤有机碳对气候变化的响应和适应对于预测未来气候变化具有十分重要的作用。然而,目前增温对土壤有机碳的影响及其影响机制仍存诸多未解决的问题。综述了目前土壤有机碳矿化的研究方式及增温对土壤有机碳矿化影响的国内外研究进展。结果发现增温往往会促进土壤有机碳排放,主要源于土壤微生物代谢活性或群落组成的改变。同时该排放强度因生态系统类型、增温方式和幅度以及增温季节和持续时间的不同而存在巨大差异,且长期增温反而使土壤微生物产生适应及驯化现象,从而降低或缓解陆地生态系统对全球变暖的正反馈效应。但这些结果大都基于温带实验,而原位增温实验对高生产力、多样性丰富的热带亚热带地区的影响是否与温带一致仍待进一步考证。室内模拟实验虽可深入研究温度对土壤有机碳矿化的影响机制,却无法真实反映野外自然环境。同时,野外增温方式及室内研究方式的多样均降低不同研究之间的可比性,进而难以预估由实验方法本身差异引起的结果变异。

    Abstract:

    Soil organic carbon is the largest carbon pool of the terrestrial ecosystem. Global warming could affect the size of carbon fluxes and result in a net release of carbon from soil to the atmospheric as CO2. The response and adaptation of soil organic carbon to climate change play an important role in predicting future effects of climate change. However, there are many unsolved issues regarding the effect of warming on soil organic carbon mineralization and its mechanism. This study reviewed the effects of warming on soil organic carbon mineralization. The results showed that warming could promote soil organic carbon emission, which primarily resulted from changes in soil microbial metabolic activity or microbial community composition. Moreover, there was a large difference in emission intensity with different ecosystem types, warming modes, warming seasons, and the durations of warming. Furthermore, soil microorganisms would acclimate and adapt to long-term warming, thus reduced or alleviated the positive feedback effect of the terrestrial ecosystem on global warming. However, these results were based mainly on temperate regions, and the effect of warming experiments in situ for areas with high productivity and rich biodiversity, such as the tropical and subtropical regions, need further research. The method of soil incubation could reveal the influence and mechanism of temperature on soil organic carbon mineralization but cannot simulate real field results. Similarly, different types of field warming, as well as variety in the types of incubation, could reduce the comparability among different methods. Moreover, it is difficult to estimate the discrepancy among the results derived from the differences in the methods. Therefore, this review put forward the prospect of an additional study, to provide a theoretical basis for further research concerning the effects of warming on soil organic carbon.

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黄锦学,熊德成,刘小飞,杨智杰,谢锦升,杨玉盛.增温对土壤有机碳矿化的影响研究综述.生态学报,2017,37(1):12~24

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