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刘彦春,张克胜,尚晴,马远超,管勇,琚煜熙.鸡公山典型落叶阔叶林土壤呼吸对食叶虫灾爆发的响应.生态学报,2017,37(21):7286~7292 本文二维码信息
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鸡公山典型落叶阔叶林土壤呼吸对食叶虫灾爆发的响应
Effect of a defoliator plague on soil respiration in a typical deciduous broadleaf forest on Jigong Mountain
投稿时间:2016-08-19  
DOI: 10.5846/stxb201608191705
关键词麻栎林  气候过渡带  碳排放  异养呼吸  温度
Key Wordsoak forest  climatic transitional zone  soil CO2 emission  heterotrophic respiration  soil temperature
基金项目国家自然科学基金(31600379);河南省高等学校重点科研项目(17A180001)
作者单位E-mail
刘彦春 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, 开封 475004  
张克胜 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, 开封 475004;洛阳理工学院, 洛阳 471023 lyzhks@126.com 
尚晴 黄河水利职业技术学院, 开封 475004  
马远超 信阳市南湾实验林场, 信阳 464031  
管勇 信阳市南湾实验林场, 信阳 464031  
琚煜熙 河南省鸡公山国家级自然保护区管理局, 信阳 464134  
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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3.55 μmol m-2 s-1,比正常年份(2.77 μmol 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 a critical pathway of carbon (C) cycling in terrestrial ecosystem. It is projected that the frequency and severity of forest pest outbreaks will increase as a consequence of increasing extreme climatic conditions. The outbreak of forest pests has been considered as one of the predominant natural disturbances affecting the C cycling of forest ecosystems. However, it remains unclear whether forest pest outbreaks will affect the emission of CO2 from forest soils in the climatic transitional zone. Based on an outbreak of a defoliator (Lampronadata cristata and Ochrostigma albibasis) in a Quercus acutissima-Liquidambar formosana mixed forest on Jigong Mountain, we compared the soil respiration between the pest plague (2014) and the following normal year (2015), in order to determine the effects of the forest pest on soil CO2 emission. We found that soil temperatures during July, August, September, and October in the pest plague year were 0.26 ℃, 0.51 ℃, 0.83 ℃, and 0.07 ℃ higher than those investigated in 2015, respectively, and soil respiration was increased by 129.9%, 77.1%, 61.6% and 58.9%. The mean soil respiration during the growing season in the pest plague year was 3.55 μmol m-2 s-1, which was 36.2% higher than that observed in the normal year (2.77 μmol m-2 s-1). The heterotrophic respiration during the growing season in pest plague year was 29.7% higher than that in the normal year. Therefore, the present study demonstrates that forest pest outbreaks can significantly increase soil CO2 emissions at least in the short term. A better understanding of the effects of forest pests on forest ecosystems is needed for accurate estimations and modeling of terrestrial ecosystem C cycling.
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