环境因子对海防林土壤呼吸速率的影响

Effects of environment factors on soil respiration rate in coastal protective forests

为了揭示土壤呼吸的日间变化规律,寻找影响土壤呼吸速率强弱的生态因子,从而为海防林的造林营林技术提供重要依据,对胶南沿海混交林和灌木林的土壤呼吸速率及各环境因子进行研究。2种海防林林地土壤呼吸速率的日变化均呈现出单峰式的变化规律,灌木林的土壤呼吸速率明显高于混交林。地表温度是对土壤呼吸速率影响最大的环境因子之一,它与混交林和灌木林的土壤呼吸速率分别呈极显著和显著正相关关系。空气相对湿度与混交林土壤呼吸速率呈显著负相关,风速与灌木林土壤呼吸速率呈显著负相关。通过主成分分析和多元线性回归方法,得到了影响海防林土壤呼吸速率的主要环境因子及与土壤呼吸速率之间的多元回归模型。

The effects of environment factors on soil respiration rate in coastal protection forest have been studied. The results indicate that the daily soil respiration rate of the mixed plantation and shrub forest varied with a regular single apex rhythm, and the soil respiration of the latter is higher than that of the former. The surface temperature is the most important influencing factor on soil respiration rate, which has clear prominent positive and the obvious positive correlation with the soil respiration rate of the mixed plantation and shrub forest respectively, the air relative humidity at 1.5 m above the surface ground has a negatively prominent influence on the soil respiration rate of the mixed plantation, and so as the influence of the wind speed on the soil respiration of shrub forest. Through the methods of main components analysis and multiple linear regressions, the main environment factors were found and two multiple linear regression models between the soil respiration rate and environment factors were set up.