Abstract:

An experiement was conducted in typical Phyllostachys praecox stands located in Lin'an, Zhejiang Province to study the dynamic change of soil respiration and the relationship between soil respiration and environmental factors. The results indicated that the soil total respiration rate, heterotrophic respiration rate, and autotrophic respiration rate of Phyllostachys praecox were 5.42, 2.24 and 2.89 μmol ·m^-2s^-1 respectively. The annual dynamic pattern displayed a double-peak curve and changed greatly. The amount of CO₂ released from Phyllostachys Praecox was 73.40 t ·hm^-2a^-1, including 45.67% heterotrophic respiration and 54.33% autotrophic respiration. Soil respiration rate, heterotrophic respiration rate and autotrophic respiration rate had strong exponential correlations with soil temperature, especially the temperature at 5 cm depth of the soil, and the Q₁₀ value at 5 cm depth was 1.70, 1.68 and 1.48 respectively. The soil respiration had significant correlation with the soil temperature in 5 cm depth, atmospheric temperature at 8: 00, water soluble organic C content, total organic C content, while it had no significant correlation with the soil water content, relative humidity at 8: 00, and the content of water soluble organic N.

Key words: Phyllostachys praecox, soil respiration, heterotrophic respiration, autotrophic respiration, Q₁₀