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生态学杂志 ›› 2012, Vol. 31 ›› Issue (10): 2461-2465.

• 研究报告 • 上一篇    下一篇

杉木人工林土壤呼吸速率对水热条件变化的响应

汪娜1,黄义雄1**,叶功富2,孙月1,王亮1   

  1. 1福建师范大学地理科学学院, 福州 350007; 2福建省林业科学研究院, 福州 350012)
  • 出版日期:2012-10-10 发布日期:2012-10-10

Responses of soil respiration rate in Chinese fir plantation to the changes of heat and moisture condition.

WANG Na1, HUANG Yi-xiong1**, YE Gong-fu2, SUN Yue1, WANG Liang1   

  1. (1College of Geographical Sciences, Fujian Normal University, Fuzhou 350007, China; 2Fujian Academy of Forestry Sciences, Fuzhou 350012, China)
  • Online:2012-10-10 Published:2012-10-10

摘要: 利用LI-8100土壤碳通量观测仪,测定福建省建阳范桥林场杉木人工林水热条件天气变化下土壤呼吸的动态变化。结果表明,土壤呼吸速率与土壤温度变化趋势较为一致,但在不同天气下其峰值出现时间有所差异,正常天气情况下其峰值出现在13:00左右,当温度与降水均产生明显变化条件下,其峰值出现在11:00。与正常温度相比,在低温或高温状况下土壤呼吸的日变化幅度也发生改变,分别是37.9%和50.6%。观测期间,伴随大幅度降温降水,土壤呼吸速率呈急剧下降,在天气变化后的第5天达到最小值,随后随温度回升而增高,土壤呼吸从降低到恢复历经10 d。统计分析表明,土壤呼吸与地表温度呈极显著正相关,与土壤体积含水量呈极显著负相关。  

关键词: 乔木层, 灌木层, 草本层, 凋落物层, 叶片, 地理因子 

Abstract: By using Li-8100, this paper studied the dynamic variations of soil respiration in a Chinese fir plantation in Jianyang of Fujian Province, East China during weather change. The soil respiration rate in the plantation had a similar variation trend with soil temperature, but the peak value of the soil respiration rate occurred at different time under different weather conditions. Normally, the peak value occurred at about 13:00, but appeared at 11:00 when the air temperature and precipitation had obvious change. The diurnal variation range of the soil respiration rate also varied under different weather conditions, being 37.9% and 50.6% at lower temperature and higher temperature, respectively. In companying with great extent of cooling and raining, the soil respiration rate decreased sharply, with the minimum on the fifth day after the weather change, and then increased with rising temperature, taking 10 days from decrease to recover. The soil respiration rate showed a significant positive correlation with the surface soil temperature, and a negative correlation with the soil moisture content.  

Key words: tree layer, shrub layer, herb layer, litter layer, leaf, geographical factor.