《Table 2 Correlation between soil respiration rate and soil humidity during the growing season for d

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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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Plant physiological activity，microbial energy supply and distribution and soil permeability are all affected by soil humidity，thereby affecting soil respiration[21].Related studies have pointed out that when soil water content is lower than field water holding capacity，soil surface CO2emission will be reduced[22].Without considering the influence of temperature，oil moisture can promote the increase of soil respiration rate within a certain range，and if the water content is too high or too low，soil respiration rate will be inhibited.Many scholars have tried to quantify the relationship between soil humidity and soil respiration rate，but the results are quite different[23].Based on the basis of previous studies，this study used quadratic curve to fit the relation between soil humidity and soil respiration rate of different vegetation types，and the effect was good.The fitting equations of soil humidity and soil respiration rate of the crop and poplar plantation were，respectively，Y=-89.514X2+30.394X-1.254 2 and Y=21.966X2+4.786X+0.353 3，with the goodness of fit of 0.4876 and 0.9185，respectively（Table 2）.According to the correlation analysis（Table 2），the correlation coefficients between soil humidity and soil respiration rate of the crop and poplar plots were，respectively，0.504 and 0.952，which meant they were significantly correlated（P<0.01）.