《Table 1 Correlation between soil respiration rate and soil temperature during the growing season fo

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《Soil Respiration Characteristics and Its Relationship with Environmental Factors of Different Vegetation Types during Growing Season in Dongting Lake》

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The root growth of plants and the activities of microorganisms in soil are affected by soil temperature，and the strength of soil respiration is directly related to the activities of microbes in plant root system and soil.It could be seen that soil temperature is one of the main factors affecting soil respiration.A large number of studies have shown that there is a clear correlation between them[20].According to Table 1，it could be seen that the soil respiration rate of the crop plot in the Dongting Lake area had a correlation coefficient of 0.885 with the surface soil temperature and a correlation coefficient of 0.741 with the 5-10 cm soil temperature.The correlation coefficient of the soil respiration rate in the poplar plot was0.708 and 0.780 with the surface and 5-10 cm soil temperatures，respectively，being extremely significant.The soil respiration rate and soil temperature were fitted using the Y=aebXexponential function（Table 1）.The results showed that the fitted equations of soil respiration rate in the crop plot with the surface and 5-10 cm soil temperatures were，respectively，Y=0.289 2e0.043 5Xand Y=0.253 2e0.054 3X，with the goodness of fit of 0.752 8 and 0.504 3，respectively；and the fitted equations of the soil respiration rate in the poplar plot with the surface and 5-10 cm soil temperatures were Y=2.381 2e0.026Xand Y=1.223 9e0.055 4X，respectively，with the goodness of fit of 0.535 8 and 0.611 6，respectively.