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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

80 70 60 50 40 30 20 10 0 Proceedings  of  the  International  Conference  on  Climate  Change,  Biodiversity  and  Ecosystem  Services  for  the 269 Sustainable  Development  Goals  (SDGs):  Policy  and  Practice  27-29  June  2016,  Cha-am,  Phetchaburi,  Thailand 40 35 30 25 20 15 10 5 0 Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan 2013 2014 2015 Precipitation (mm) Air, Soil temperature (°C) and soil water content (%VWC) P Ta avg Ta max Ta min Ts avg Ts max Ts min SWC Fig.1  Daily  mean  air  temperature  (solid  line),  max  air  temperature  (red  closed  triangle  symbol),  min  air  temperature  (blue  closed  circle  symbol)  and,  daily  sum  rainfall  (solid  bar  in  unit  of mm)  measured  at  36  m  height  from  the  soil  surface.  Daily  mean  soil  temperature  (grey  square  dot  line),  max  soil  temperature  (green  cross  symbol),  min  soil  temperature  (orange  open  circle  symbol)  and  daily  mean  soil  water  content  (brown  plus  symbol)  in  unit  of% VWC  at  5  cm  depth  during  the  study  period.  Note  that  Ta,  Ts,  P  and  SWC  represented  air  temperature,  soil  temperature,  precipitation  and  soil  water  content  respectively The  pattern  of  soil  water  content  (SWC)  in  general  changed  corresponding  to  the  precipitation.  During  the  dry  season  (November-April)  the  mean  SWC  ranged  between  10-14%  VWC  in  addition  to  wet  season  were  about  12-18%  VWC.  The  annual  mean  of  SWC  was  13.47±3.02%VWC  and  maximum  (25.08%VWC)  o c c u r r e d   i n  November  2015  because  we  found  that  the  rainfall  lasted  for  2  hours  (6.00-8.00  pm)  consecutively  in  that  day  (27.68  mm),  while  the minimum  was  found  in  April  2014  (9.67% VWC)  when  the  dry  period  started.  B.  Monthly  variations  of  GPP,  ET  and WUE Figure  2  shows  the  monthly  patterns  of gross  primary  productivity  (GPP)  during  the  study  period  which  varied  between  46  to  262  g C  m-2  month-1  (164±55  g  C  m-2  month-1)  and  maximum  was  founded  in  wet  season  such  as  in  June  in  2014,  while  minimum  was  occurred  in  March  in  2015,  during  dry  season.  These  patterns  were  correlated  significantly  (R2=0.81, P<0.01)  with  evapotranspiration  (ET)  (Fig.3).  The  monthly  of  ET  was  ranged  between  33  to  96  kg  H2O  m-2  month-1  (67±18  kg  H2O  m-2  month-1)  in  addition  high  ET  was  found  in  wet season  (May  to  October)  and  the  rest  was  found  in  dry  season  (November  to  April).  High ecosystem  water  use  efficiency  (WUE)  occurred  during  transition  from  wet  to  dry  and  varied  between  1.39  to  3.39  g  C  kg-1  H2O  during  study  period.  The  annual  WUE  was  2.43±0.44  g  C  kg-1  H2O.  This  study  was  consistent  that  of  a  warm-temperate  mixed  plantation  in  north  China  reported  by  Tong,  et  al.  (2014),  who  found  that WUE  ranged  from  1.72  to  2.41  g  C  kg-1 H2O


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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