a GPP ET y = 0.0017x2 - 0.2997x + 104.21 0 100 200 300 400 500 c R² = 0.6738, P<0.01 y = 0.2194x + 4.1395 R² = 0.6658, P<0.01 Net radiation (MJ m-2 month-1) 0.0 0.5 1.0 1.5 2.0 2.5 e y = 266.19e-0.534x R² = 0.4927, P<0.01 y = 90.79e-0.336x R² = 0.3576, P<0.01 VPD (kPa) y = -2.6696x2 + 127.81x - 1347.5 R² = 0.1639, P<0.01 y = -1.1302x2 + 54.906x - 592.64 R² = 0.2927, P<0.01 120 100 80 60 40 20 0 120 100 80 60 40 20 0 120 100 80 60 40 20 0 300 250 200 150 100 50 0 300 250 200 150 100 50 0 300 250 200 150 100 50 0 15 18 20 23 25 28 30 GPP (g C m-2 month-1) ET (kg H2O m-2 month-1) ET (kg H2O m-2 month-1) GPP (g C m-2 month-1) ET (kg H2O m-2 month-1) GPP (g C m-2 month-1) Air temperature (°C) b 0 20 40 60 80 100 d y = 31.745e0.0234x R² = 0.6104, P<0.01 Relative humidity (%RH) y = -1.8534x2 + 64.024x - 346.92 R² = 0.4293, p<0.01 y = 22.693e0.0154x R² = 0.4871, P<0.01 y = -0.8483x2 + 27.78x - 146.79 R² = 0.4932, P<0.01 120 100 80 60 40 20 0 5.0 7.5 10.0 12.5 15.0 17.5 20.0 Soil water content (%VWC) y = -0.0021x2 + 0.7014x + 137.96 R² = 0.172, P<0.01 y = -0.0009x2 + 0.3123x + 54.763 R² = 0.3455, P<0.01 ET (kg H2O m-2 month-1) 120 100 80 60 40 20 0 120 100 80 60 40 20 0 300 250 200 150 100 50 0 300 250 200 150 100 50 0 300 250 200 150 100 50 0 f 0 50 100 150 200 250 300 Precipitation (mm month-1) Fig.4 Relationship of monthly gross primary productivity (GPP), evapotranspiration (ET) with (a) monthly mean net radiation, (b) relative humidity, (c) water vapor pressure deficit, (d) soil water content, (e) air temperature and (f) monthly total precipitation during study period (2013-2015) in dry dipterocarp forest y = 0.4203x2 - 20.445x + 250.7 R² = 0.771 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 b 23.0 23.5 24.0 24.5 25.0 25.5 26.0 Soil water content (%VWC) y = 1.3278x2 - 4.1046x + 4.9817, R² = 0.7543 y = -1.8964x2 + 3.475x + 1.0748, R² = 0.0833 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 a Dry season Wet season 0.0 0.5 1.0 1.5 2.0 2.5 WUE (g C kg-1 H2O) VPD (kPa) Fig.5 Relationship of ecosystem water use efficiency (WUE) with (a) monthly mean water vapor pressure deficit (VPD) and (b) seasonal mean soil water content. Note that dry season represent November to April and wet season represent May to October during study period (2013-2015) in dry dipterocarp forest 272 Proceedings of the International Conference on Climate Change, Biodiversity and Ecosystem Services for the ET (kg H2O m-2 month-1) ET (kg H2O m-2 month-1) Sustainable Development Goals (SDGs): Policy and Practice 27-29 June 2016, Cha-am, Phetchaburi, Thailand
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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