Soil Respiration of Three Typical Subtropical Forest Ecosystems in Tianmu Mountain of China
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摘要: 为了解中国亚热带森林土壤碳释放CO2与区域气候环境的关系,在亚热带典型区域浙江西天目山选择森林生态系统类型杉木林、毛竹林和常绿阔叶林,采用LI-8100开路式土壤碳通量测量系统测定土壤呼吸通量.结果表明:各林分的土壤呼吸日变化趋势多呈单峰型;3个森林生态系统中,土壤CO2年均释放速率大小依次是毛竹林4.28μmol/(m2·s)、杉木林2.35μmol/(m2·s)、常绿阔叶林2.23μmol/(m2·s).土壤呼吸随着不同季节土壤温度的变化相异,8月最高,11月受低温限制,呼吸作用微弱.土壤水分与土壤呼吸呈负相关,且常与土壤温度一起共同作用于土壤呼吸,这种非线性交互作用导致环境因子影响土壤呼吸的过程.Abstract: The soil respiration(SR) of three typical forest ecosystems,which were Chinese fir,broadleaf evergreen and Phyllostachys pubescens,were measured by the infrared system(LI-8100) in situ in West Tianmu Mountain of Chinese subtropical area,to study the relationship between the fluxes of CO2 released from this soil carbon pool and the change of the regional climatic environment.The results indicated that the diurnal soil respiration in the three stands almost varied in a single-peaked pattern.Among the three stands,the annual average CO2 efflux rate of Phyllostachys pubscens(3.82 μmo l/(m2·s)) was the greatest,that of broadleaf evergreen(2.23 μmo l/(m2·s))was the lowest,and that of Chinese fir(2.35 μmo l/(m2·s))was in between them.Generally,soil respiration rate increased with soil temperature.In summer(August),the CO2 effluxes of the three stands rose to the maximum,but dropped greatly in winter(November).Soil moisture was in a negative linear correlation with SR,and together with soil temperature,had mutual effects on SR.In conclusion,the environmental factors interacted with each other and influenced the process of SR.
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Key words:
- soil respiration /
- carbon cycle /
- subtropical forests /
- Tianmu Mountain
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