鸡公山典型落叶阔叶林土壤呼吸对食叶虫灾爆发的响应

发布时间：2018-05-31 21:54

本文选题：麻栎林 + 气候过渡带　；参考：《生态学报》2017年21期

【摘要】：土壤呼吸是陆地生态系统碳循环的关键环节之一。随着极端气候事件的频发,森林虫害的发生频率和强度也趋于增加,森林虫害爆发已经是影响森林生态系统碳循环过程的一种重要的自然干扰。气候过渡带典型森林生态系统虫灾的爆发是否会影响土壤的碳排放过程目前仍不清楚。本研究利用鸡公山地区麻栎-枫香混交林大规模爆发食叶性害虫的机会,比较虫灾爆发当年(2014)与正常年份(2015)的土壤碳排放通量,以阐明森林虫灾爆发对土壤碳排放通量的影响。结果表明:虫灾爆发当年7、8、9、10月份土壤平均温度比正常年份相应各月份分别高0.26、0.51、0.83、0.07℃,土壤呼吸分别显著提高了129.9%、77.1%、61.6%和58.9%。虫灾爆发年份生长季的平均土壤呼吸为3.55μmol m~(-2)s~(-1),比正常年份(2.77μmol m~(-2)s~(-1))高36.2%;生长季期间的平均土壤异养呼吸比正常年份增加了29.7%。该研究表明森林食叶虫害的爆发至少在短期内可导致森林土壤碳排放量呈显著的增加趋势,近而对森林生态系统土壤碳库积累产生重要影响。因此,充分认识病虫害对森林生态系统的干扰和影响,将有助于陆地生态系统碳循环的准确估算和模拟。
[Abstract]:Soil respiration is one of the key links of terrestrial ecosystem carbon cycle. With the frequent occurrence of extreme climate events, the occurrence frequency and intensity of forest pests tend to increase. Forest pest outbreaks have become an important natural disturbance affecting the carbon cycle of forest ecosystems. It is still unclear whether the outbreak of insect pests in typical forest ecosystems in the transitional zone will affect the carbon emission process of soil. In order to elucidate the effect of forest pest outbreak on soil carbon fluxes, we used the opportunity of large-scale outbreak of leaf-eating pests in Quercus acutis-Maple mixed forest in Jigongshan area to compare the soil carbon emission fluxes between the year of pest infestation (2014) and the normal year (2015) in order to elucidate the effect of forest pest outbreak on soil carbon emission flux. The results showed that the average soil temperature in October was higher than that in normal year. The soil respiration was significantly increased by 129.9% and 58.9%, respectively. The average soil respiration in the growing season was 3.55 渭 mol / m ~ (-1), which was 36.2% higher than that in the normal year (2.77 渭 mol ~ (-2), and the average soil heterotrophic respiration during the growing season was 29.7 ~ (th) higher than that in the normal year. This study shows that the outbreak of forest leaf-eating pests can lead to a significant increase in forest soil carbon emissions in at least a short period of time, which has an important impact on the accumulation of soil carbon pool in forest ecosystem. Therefore, it is helpful to estimate and simulate the carbon cycle of terrestrial ecosystem by fully understanding the disturbance and influence of pests and diseases on forest ecosystem.
【作者单位】：河南大学生命科学学院河南省全球变化生态学国际联合实验室;洛阳理工学院;黄河水利职业技术学院;信阳市南湾实验林场;河南省鸡公山国家级自然保护区管理局;
【基金】：国家自然科学基金(31600379) 河南省高等学校重点科研项目(17A180001)
【分类号】：S714;S763

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