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重庆缙云山针阔混交林地土壤呼吸速率及温度敏感性特征分析

于 雷 王玉杰 王云琦 张会兰 孙素琪 周 彬

于 雷, 王玉杰, 王云琦, 张会兰, 孙素琪, 周 彬. 重庆缙云山针阔混交林地土壤呼吸速率及温度敏感性特征分析[J]. 环境科学研究, 2014, 27(1): 57-63.
引用本文: 于 雷, 王玉杰, 王云琦, 张会兰, 孙素琪, 周 彬. 重庆缙云山针阔混交林地土壤呼吸速率及温度敏感性特征分析[J]. 环境科学研究, 2014, 27(1): 57-63.
YU lei, WANG Yu-jie, WANG Yun-qi, ZHANG Hui-lan, SUN Su-qi, ZHOU Bin. Variations of Soil Respiration Characteristics and Temperature Sensitivity in the Mixed Forest at Jinyun Mountain, Chongqing[J]. Research of Environmental Sciences, 2014, 27(1): 57-63.
Citation: YU lei, WANG Yu-jie, WANG Yun-qi, ZHANG Hui-lan, SUN Su-qi, ZHOU Bin. Variations of Soil Respiration Characteristics and Temperature Sensitivity in the Mixed Forest at Jinyun Mountain, Chongqing[J]. Research of Environmental Sciences, 2014, 27(1): 57-63.

重庆缙云山针阔混交林地土壤呼吸速率及温度敏感性特征分析

基金项目: 国家林业公益性行业科研专项(201104009-03)

Variations of Soil Respiration Characteristics and Temperature Sensitivity in the Mixed Forest at Jinyun Mountain, Chongqing

  • 摘要: 以重庆缙云山亚热带针阔混交林为研究区,研究了土壤呼吸及其Q10(温度敏感性系数,指温度增加10℃所造成的呼吸速率改变的商)的时间变异特征,并深入分析二者受土壤温度、湿度变化的影响. 2011年4—12月采用LI-8100二氧化碳通量测量系统观测选取样地的RS (土壤呼吸速率)、土壤5cm深处的T5(土壤温度)和W5(土壤湿度),分析RS与Q10的变化规律;同时利用单一和二元混合模型探讨T5和W5对RS、Q10的影响. 结果表明:①在观测期内RS和T5月均值均呈单峰曲线变化;RS的变化范围在(1.38±0.15)~(3.94±0.21)μmol/(m2·s)之间,T5的变化范围在(9.28±0.65)~(22.99±1.14)℃之间;由于受到自然降水影响,W5的月际变化不规律. ②Q10季节差异明显,最大值(3.31)出现在春季,观测期内的平均值为2.01. ③RS与T5之间呈显著正相关(P<0.05),与W5的关系不明显(P>0.05);RS与T5、W5的关系模型拟合度分别为87%和26%;T5与W5的复合模型对RS的变化解释能力为89%,高于单一模型. ④影响Q10的主要因素是T5,其次为W5.

     

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出版历程
  • 收稿日期:  2013-05-17
  • 修回日期:  2013-10-30
  • 刊出日期:  2014-01-25

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