Table 1 Variations in soil respiration (Rs) and their environmental factors in dry dipterocarp forest and mixed deciduous forest Values Values Dry Dipterocarp Forest at DFR site (181 days) Dry Dipterocarp Forest at DFR site (181 days) Mixed Deciduous Forest at MKL site (181 days) Mixed Deciduous Forest at MKL site (181 days) Max Min Mean SD %C V n Max Min Mean SD %CV n Max Min Mean SD %C V n Max Min Mean SD %CV n Soil CO2Concentration Soil CO2Concentration at depth of 5 cm (μmol m-3) 4887.3 506.4 1826.6 1140.7 62.4 15627 4573.4 138.4 1543.9 728.1 47.2 17157 at depth of 20 cm (μmol m-3) 5191.9 926.5 2766.2 1386.1 50.1 15627 10693.5 239.6 3918.4 1524.6 38.9 12926 at depth of 5 cm (μmol m-3) 4887.3 506.4 1826.6 1140.7 62.4 15627 4573.4 138.4 1543.9 728.1 47.2 17157 at depth of 20 cm (μmol m-3) 5191.9 926.5 2766.2 1386.1 50.1 15627 10693.5 239.6 3918.4 1524.6 38.9 12926 Soil Volumetric Moisture (%) 49.8 23.6 29.6 5.8 19.7 15315 63.3 15.6 20.8 6.9 33.2 17298 Soil Temperature ( ) 39.4 17.2 27.3 4.1 15.1 5769 30.5 17.5 24.8 2.3 9.3 17157 Soil Volumetric Moisture (%) 49.8 23.6 29.6 5.8 19.7 15315 63.3 15.6 20.8 6.9 33.2 17298 Soil Temperature ( ) 39.4 17.2 27.3 4.1 15.1 5769 30.5 17.5 24.8 2.3 9.3 17157 Air Temperature ( ) 39.8 19.2 29.9 3.8 12.9 12825 38.4 12.4 25.9 4.5 17.4 17376 Rainfall (mm) 33.5 0.1 (Total = 427 mm) 267 18.50 0.50 (Total = 349 mm) 338 Soil CO2 Efflux (μmol m-2 s-1) 4.31 0.15 1.89 0.80 42.1 15626 16.29 0.02 4.82 2.25 46.7 12919 Air Temperature ( ) 39.8 19.2 29.9 3.8 12.9 12825 38.4 12.4 25.9 4.5 17.4 17376 Rainfall (mm) 33.5 0.1 (Total = 427 mm) 267 18.50 0.50 (Total = 349 mm) 338 Soil CO2Efflux (μmol m-2 s-1) 4.31 0.15 1.89 0.80 42.1 15626 16.29 0.02 4.82 2.25 46.7 12919 y = 0.1133x - 1.3853 R² = 0.6089, n = 150 y = 0.1133x - 1.3853 R² = 0.6089, n = 150 5.0 5.0 4.5 4.5 4.0 4.0 3.5 3.5 3.0 3.0 2.5 2.5 2.0 2.0 1.5 1.5 1.0 1.0 0.5 0.5 0.0 0.0 12.0 12.0 10.0 10.0 8.0 8.0 6.0 6.0 4.0 4.0 2.0 2.0 Soil CO2 effluxs at DFR (μmol m-2 s-1) a) b) c) d) y = 0.2787x - 0.731 R² = 0.7493, n = 136 0.0 5 10 15 20 25 30 35 40 45 50 55 Soil CO2 effluxs at MKL (μmol m-2 s-1) Soil volumetric moisture (%) 15.0 17.5 20.0 22.5 25.0 27.5 30.0 32.5 35.0 Soil temperature ( C) 156 Proceedings of the International Conference on Climate Change, Biodiversity and Ecosystem Services for the Sustainable Development Goals (SDGs): Policy and Practice 27-29 June 2016, Cha-am, Phetchaburi, Thailand Soil CO2 effluxs at DFR (μmol m-2 s-1) 0.0 5 10 15 20 25 Soil CO2 effluxs at MKL (μmol m-2 s-1) 25.0 27.5 30.0 32.5 35.0 ( C) a) b) c) d) Fig.2 Relationships between daily mean soil CO2 effluxes with; a) soil moisture at DFR site, b) soil temperature at DFR site, c) soil moisture at MKL site, and d) soil temperature at MKL site
Proceedings of International Conference on Climate Change, Biodiversity and Ecosystem Services for the Sustainable Development Goals : Policy and Practice 27-29 June 2016 at the Sirindhorn International Environmental Park, Cha-am, Phetchaburi, Thailand
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