文章摘要
程功,刘廷玺,王冠丽,段利民,李东方.降雨和凋落物对人工杨树林土壤温室气体通量的影响[J].农业环境科学学报,2019,38(6):1398-1407.
降雨和凋落物对人工杨树林土壤温室气体通量的影响
Effects of rainfall and litter on soil greenhouse gas fluxes in artificial poplar forest
投稿时间:2018-10-07  
DOI:10.11654/jaes.2018-1252
中文关键词: CO2  凋落物  降雨  CH4  温度敏感性  温室气体
英文关键词: CO2  litter  rainfall  CH4  temperature sensitivity  greenhouse gas
基金项目:国家自然科学基金重点国际合作、重点与地区项目(51620105003,51139002,51669017,51769020);教育部科技创新团队滚动发展计划项目(IRT_17R60);科技部重点领域创新团队项目(2015RA4013);内蒙古自治区草原英才创业创新人才团队、内蒙古农业大学寒旱区水资源利用创新团队项目(NDTD2010-6)
作者单位E-mail
程功 内蒙古农业大学水利与土木建筑工程学院, 呼和浩特 010018  
刘廷玺 内蒙古农业大学水利与土木建筑工程学院, 呼和浩特 010018
内蒙古自治区水资源保护与利用重点试验室, 呼和浩特 010018 
txliu1966@163.com 
王冠丽 内蒙古农业大学水利与土木建筑工程学院, 呼和浩特 010018
内蒙古自治区水资源保护与利用重点试验室, 呼和浩特 010018 
 
段利民 内蒙古农业大学水利与土木建筑工程学院, 呼和浩特 010018
内蒙古自治区水资源保护与利用重点试验室, 呼和浩特 010018 
 
李东方 内蒙古农业大学水利与土木建筑工程学院, 呼和浩特 010018
内蒙古自治区水资源保护与利用重点试验室, 呼和浩特 010018 
 
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中文摘要:
      本研究以科尔沁沙丘-草甸梯级生态系统中人工杨树林为研究对象,于2017年5-10月采用静态箱-气相色谱法,对CO2、CH4和N2O进行了原位观测,探究降雨和凋落物对森林生态系统土壤温室气体通量的影响,实验共设3个处理:"Ⅰ-去除凋落物"、"Ⅱ-维持原状"和"Ⅲ-加倍凋落物"。结果表明:土壤状态较干燥的5月23日及7月20日雨后CH4吸收值在短时间内均有所增加,土壤温度较高的7月20日雨后CH4吸收值增长率远大于土壤温度较低的5月23日,土壤状态较湿润的8月4日雨后CH4吸收值呈明显降低趋势;降雨前后CH4通量均表现为吸收,且其吸收强度表现为:处理Ⅰ > 处理Ⅱ > 处理Ⅲ。生长季N2O排放与CH4吸收之间呈现显著的线性负相关关系(P<0.05)。Ⅰ、Ⅱ、Ⅲ处理后生长季CO2通量平均值分别为243.47、357.14、406.36 mg·m-2·h-1,去除凋落物使土壤CO2通量显著降低30.81%,加倍凋落物则使CO2通量显著提高13.78%,去除凋落物处理对土壤CO2通量的降低幅度远大于加倍凋落物对土壤CO2通量的提高幅度;生长季土壤CO2的温度敏感性(Q10)表现为:处理Ⅰ(1.070) > 处理Ⅱ(1.046) > 处理Ⅲ(1.011),不同凋落物处理下林地土壤CO2通量对土壤温度响应的差异不显著。
英文摘要:
      The paper was based on the artificial poplar forests in the Horqin sand dune-meadow cascade ecosystem. In the period from May to October in 2017, the author used static chamber-GC (a chromatographic analyzer using gas as a mobile phase, and the type is Agilent 7890B) technique to conduct in situ observation on the greenhouse gas fluxes including CO2, CH4 and N2O. To explore the effects of rainfall and litter on the greenhouse gas fluxes in forest ecosystem, the experiments were divided into three phases:Ⅰ-no litter, Ⅱ-control check and Ⅲ-double litter. The results showed that the CH4 absorption increased in a short period of time after rainfall on May 23 and July 20, and the growth rate on July 20 was much higher than that on May 23 on account of the higher soil temperature. On August 4th, the CH4 absorption significantly decreased when the soil moisture was higher after rainfall. The CH4 flux showed absorption before and after rainfall, and the absorption intensity demonstrated:"I-no litter" > "Ⅱ-control check" > "Ⅲ-double litter". There was a distinctly negative linear correlation between N2O emission and CH4 absorption in the growing season (P<0.05). The average CO2 fluxes in the growing season showed:"Ⅰ-no litter":243.47 mg·m-2·h-1,"Ⅱ-control check":357.14 mg·m-2·h-1, and "Ⅲ-double litter":406.36 mg·m-2·h-1. The soil CO2 flux of the "no-litter" set decreased 30.81%, while the soil CO2 flux of the "double-litter" set increased 13.78%, which can be inferred that the decreasing range of soil CO2 flux caused by litter removal was much greater than the increasing range of soil CO2 flux caused by double litter; the temperature coefficient (Q10) of soil greenhouse gases during the growing season presented:"Ⅰ-no litter" (1.070) > "Ⅱ-control check" (1.046) > "Ⅲ-double litter" (1.011). The impacts of soil CO2 fluxes had to soil temperature under different circumstances of litter treatments were not significantly uneven.
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