极端降雪对北亚热带-暖温带气候过渡带人工林土壤呼吸的影响
Effect of Extreme Snowfall on Soil Respiration in a Plantation in a North Subtropical-warm Temperature Transition
投稿时间:2019-07-21  修订日期:2019-09-02
DOI:
中文关键词:  极端降雪  土壤碳通量  华中地区  人工林
英文关键词:extreme snowfall  soil carbon flux  central China  artificial forest
基金项目:
作者单位E-mail
昝志曼 河南科技大学 2716638632@qq.com 
刘彦春 河南大学  
刘银占 河南大学  
轩娟 河南大学  
赵威 河南科技大学 zhaowei1@haust.edu.cn 
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中文摘要:
      近年来受人类活动影响,极端气候事件的发生频率越来越高。其中极端降雪是一个近年来受人类活动影响,极端气候事件的发生频率越来越高。其中极端降雪是一个重要方面,对生态系统碳循环具有重要影响。但是目前关于极端降雪事件对亚热带-暖温带气候过渡带人工林土壤呼吸的影响机制还缺乏足够的理解。本研究以信阳市人工林为研究对象,以2018年1月信阳市的暴雪为契机,设置了一项包括增加雪被、自然降雪、去除雪被的控制实验,利用LI-8100测定了不同厚度雪被处理下土壤呼吸的变化,并结合土壤温度、土壤湿度、土壤微生物量碳氮含量、土壤可利用性氮含量等变化,研究土壤呼吸与环境因子之间的关系。结果表明:增加雪被在实验前期显著提高了土壤温度,但是增加雪被处理下实验中后期土壤温度值及整个实验阶段的土壤温度平均值均显著低于对照处理。增加雪被厚度可使土壤呼吸速率提高21.57%,而去除雪被对土壤呼吸速率无显著影响。雪被变化对于微生物量碳氮、土壤可利用性氮含量均无显著影响。增雪处理引起的土壤呼吸速率增加主要是由于实验前期土壤温度的升高导致的。本结果可为建立气候变化下的生态系统碳循环模型提供部分数据支持。
英文摘要:
      The frequency of extreme climate changes has continued to dramatically increase due to the impacts of human activity in recent years. As one of key factors that result in climate change, extreme snowfall can drastically affect the ecosystem carbon flux. However, the effect of snowfall on soil respiration in artificial forest in north subtropical-warm temperature transition is still lack of an essential understanding. A controlled experiment including snow addition, natural snowfall and snow remove was conducted in an artificial forest after a heavy snowfall in January 2018 in Xinyang city. Soil respiration variations under different treatments were measured with LI-8100 in different snow cover depths. Soil temperature, soil moisture, microbial biomass carbon, microbial biomass nitrogen, and soil available nitrogen content was detected to determine the relationships between soil respiration and environmental factors. The results indicated that the snow addition significantly elevated soil temperature during the earlier time of the experiment. However, soil temperature under the snow addition treatment was significantly lower than it in the control during the middle and later time, and across the whole experiment, respectively. Snow addition elevated the soil respiration rate by 21.57%, but snow remove did not affect the soil respiration. Snowfall changes did not affect the microbial biomass carbon, microbial biomass nitrogen and soil available nitrogen content. The elevated soil respiration was mainly ascribed to the elevation of soil temperature in the early stage of the experiment. The results can provide basic data for the estimation of ecosystem carbon cycle model under climate change scenario.
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