自然资源学报 ›› 2012, Vol. 27 ›› Issue (12): 2057-2070.doi: 10.11849/zrzyxb.2012.12.007

• 资源生态 • 上一篇    下一篇

温度和水分对中亚热带人工林生态系统呼吸的调控作用

张舒1,2, 申双和1, 温学发2, 张心昱2, 孙晓敏2, 王辉民2   

  1. 1. 南京信息工程大学 应用气象学院, 南京 210044;
    2. 中国科学院 地理科学与资源研究所 生态系统网络观测与模拟重点实验室, 北京 100101
  • 收稿日期:2012-04-16 修回日期:2012-06-19 出版日期:2012-12-20 发布日期:2012-12-20
  • 通讯作者: 温学发,E-mail:wenxf@igsnrr.ac.cn E-mail:wenxf@igsnrr.ac.cn
  • 作者简介:张舒(1986-),女,硕士,研究方向为生态系统呼吸。E-mail:zhangshu8605@126.com
  • 基金资助:

    中国科学院知识创新工程重要方向项目青年人才项目(KZCX2-EW-QN305);国家自然科学基金项目(31070408,31130009)。

The Regulation of Soil Temperature and Water on Ecosystem Respiration of a Subtropical Plantation under the Seasonal Drought

ZHANG Shu1,2, SHEN Shuang-he1, WEN Xue-fa2, ZHANG Xin-yu2, SUN Xiao-min2, WANG Hui-min2   

  1. 1. College of Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China;
    2. Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China
  • Received:2012-04-16 Revised:2012-06-19 Online:2012-12-20 Published:2012-12-20

摘要:

全球气候变化导致的降水格局改变影响陆地生态系统碳收支状况。陆地生态系统所固定的碳主要通过呼吸作用返回到大气中,而温度和水分是调节生态系统呼吸的重要因素。ChinaFLUX千烟洲中亚热带人工林通量站夏季雨热不同季而造成的季节性干旱为探讨温度和水分对生态系统呼吸的调控作用提供了天然的试验条件。研究利用该生态系统2003-2010年涡度相关和常规气象数据,阐述了生态系统呼吸对温度和土壤含水量的响应特征,对比分析了只考虑温度与同时考虑温度和土壤含水量对生态系统呼吸的季节模式和年呼吸量的影响。研究表明,生态系统呼吸的季节变异主要受土壤温度的控制,呈现指数响应特征。但是,在干旱胁迫条件下,土壤含水量对生态系统呼吸的季节变异起到明显的调控作用。参考温度下的生态系统呼吸(Rref)明显受土壤含水量的影响。生态系统年呼吸量为1 289.4±73.9 gC·m-2·a-1,两类模型的估算结果没有显著差异。但是在生态系统的季节变异上,两类模型估算存在显著差异,同时考虑温度与土壤含水量的模型更适合模拟遭受干旱胁迫的生态系统呼吸。

关键词: 生态系统呼吸, 温度, 土壤含水量, 季节变异, 温度敏感性

Abstract:

The carbon balance has been affected by altered precipitation patterns caused by global climate changes. The carbon sequestrated by terrestrial ecosystems returns to the atmosphere mainly through respiration, of which temperature and water are two essential factors in regulating ecosystem respiration (Reco). Seasonal drought caused by the imbalance of heat and rain provides natural experimental conditions to investigate the regulation of temperature and water on ecosystem respiration in the ChinaFLUX Qianyanzhou subtropical plantation. Based on the eddy covariance and conventional meteorological data collected from 2003 to 2010, this study analyzed the response of ecosystem respiration to temperature and soil water content, and explored the effects of temperature or both temperature and soil water content on ecosystem respiration seasonality and annual respiration. The study showed that the seasonal variations of ecosystem respiration were mainly controlled by soil temperature, and Reco was an exponential function of soil temperature. Only under drought condition can soil water content play a significant role in regulation. With only temperature taken into account, the ecosystem respiration rate at the reference temperature (Rref) was significantly affected by soil water content; while with temperature and soil water content taken into account, the ecosystem respiration under reference temperature was not affected by soil water content. There was no evident difference between considering temperature alone and both temperature and soil water content, the ecosystem respiration amount was 1289.4±73.9 g C·m-2·a-1. But the seasonal variations of ecosystem respiration had significant differences between 2003 and 2010 whether a seasonal drought existed or not.

Key words: respiration, temperature, soil water content, seasonal variation, Q10

中图分类号: 

  • Q148