植物生态学报 ›› 2015, Vol. 39 ›› Issue (9): 849-856.DOI: 10.17521/cjpe.2015.0081

• •    下一篇

北京东灵山3种温带森林土壤呼吸及其20年的变化

姚辉, 胡雪洋, 朱江玲, 朱剑霄, 吉成均, 方精云*()   

  1. 北京大学城市与环境学院生态学系, 北京大学地表过程分析与模拟教育部重点实验室, 北京 100871
  • 收稿日期:2015-06-03 接受日期:2015-06-20 出版日期:2015-09-03 发布日期:2015-09-23
  • 通讯作者: 方精云
  • 作者简介:

    * 共同第一作者 Co-first author

  • 基金资助:
    国家自然科学基金(31321061和3133- 0012)、全球变化研究国家重大科学研究计划(2014- CB954001)和中国科学院先导项目(XDA0505- 0000)

Soil respiration and the 20-year change in three temperate forests in Mt. Dongling, Beijing

YAO Hui, HU Xue-Yang, ZHU Jiang-Ling, ZHU Jian-Xiao, JI Cheng-Jun, FANG Jing-Yun*()   

  1. Department of Ecology, College of Urban and Environmental Sciences, and Key Laboratory for Earth Surface Processes of the Ministry of Education, Peking University, Beijing 100871, China
  • Received:2015-06-03 Accepted:2015-06-20 Online:2015-09-03 Published:2015-09-23
  • Contact: Jing-Yun FANG
  • About author:

    # Co-first authors

摘要:

土壤呼吸是陆地生态系统最主要的碳释放过程。为了探讨温带森林土壤呼吸在长时间尺度的变化, 利用北京东灵山地区的白桦(Betula platyphylla)林、辽东栎(Quercus wutaishanica)林和油松(Pinus tabuliformis)林3种温带森林永久样地, 于2012-2015年对其土壤呼吸进行测定, 并与1994-1995年的测定结果进行了比较。结果显示: 2012-2015年, 白桦林的平均年土壤呼吸量为(574 ± 21) g C·m-2·a-1, 显著高于辽东栎林(455 ± 31) g C·m-2·a-1和油松林(414 ± 35) g C·m-2·a-1, 比20年前(1994-1995年)的估测值分别增加了85%、17%和73%。这些结果表明, 近20年来这3种生态系统的碳周转速率明显加快。

关键词: 土壤呼吸, 5 cm土壤温度, 温度敏感性系数(Q10), 年通量, 温带森林

Abstract: <i>Aims</i>

Our objective was to explore changes in soil respiration of three temperate forests in Mt. Dongling, Beijing over the last 20 years from the year of 1994-1995 to 2012-2015.

<i>Methods</i>

We re-investigated the permanent plots of three temperate forests (Betula platyphylla forest, Quercus wutaishanica forest and Pinus tabuliformis forest) which were established in 1992. We measured soil respiration for 3 years (2012-2015) using a LI-8100 Soil Respiration System. Continuous soil temperatures at 5 cm depth were measured at the same time. Annual soil respiration was accumulated using a relationship between soil respiration and soil temperature .

<i>Important findings</i>

We found that soil respiration rates were significantly correlated with soil temperature at 5 cm depth and that these correlations differed remarkably among the three forests. Annual soil respiration in B. platyphylla forest was highest, with a 3-year average of (574 ± 21) g C·m-2, followed by Q. wutaishanica forest ((455 ± 31) g C·m-2) and P. tabuliformis forest ((414 ± 35) g C·m-2). In the past 20 years, annual soil respiration in all these forests increased significantly: compared to 1994-1995, the average in 2012-2015 increased by 85%, 17% and 73% for B. platyphylla, Q. wutaishanica, and P. tabuliformis forests, respectively.

Key words: soil respiration, soil temperature at 5 cm depth, temperature sensitivity (Q10), annual flux, temperate forest