Statistical analysis
All the analysis was performed on log-transformed data to transform the skewed data to approximately conform to normality. The Kolmogorov – Smirnov test was used to test for normality. Then, an analysis of CO2 emission rates for detecting significant differences among the termite mound species was tested by the analysis of variance ANOVA as well as their surrounding soils during the dry and wet seasons. Mean for groups in homogeneous subset among species were evaluated by Tukey HSD’s post hoc test. The difference of CO2emission from the nest and surrounding soil in each species was tested by t-test. The relationship between CO2 emission from surrounding soil and the soil environmental factors (i.e. soil temperature and soil moisture content) was determined with the Pearson correlation analysis. All statistical calculations were performed in SPSS ver. 20.0.0 for Windows.