[Simulation of rice canopy evapotranspiration and water use efficiency under free-air CO2 enrichment].
By using FACE system, the microclimate in rice canopy and related physiological indices were observed continuously from the elongation to the maturing stage of rice growth, and the effects of FACE on the rice canopy evapotranspiration and water use efficiency were studied and simulated with energy balance analysis. The results showed that using P-M equation to describe the quantitative relationships of rice leaf stomatal conductance with photosynthetically active radiation (PAR) and vapour pressure deficit (VPD) could better simulate rice canopy evapotranspiraton under FACE and ambient conditions. During observation period, the total water use of rice in FACE plot had a 10 mm decrease, compared with that in control plot. Considering of the 12% increase of total biomass, the water use efficiency of rice under FACE condition was increased by 12%.
Wang
Ming-na
MN
State Key Laboratory of Soil and Sustainable Agriculture, Nanjing Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China. dihna@163.com
Luo
Wei-hong
WH
Sun
Yan-kun
YK
Zhu
Jian-guo
JG
D000393:Air Pollutants / Q000032:analysis*; D018533:Biomass; D002245:Carbon Dioxide / Q000032:analysis*; D003198:Computer Simulation; D008962:Models, Theoretical; D012275:Oryza / Q000254:growth & development / Q000378:metabolism*; D010788:Photosynthesis; D018526:Plant Transpiration; D014867:Water / Q000378:metabolism*
D000393:Air Pollutants; D014867:Water; D002245:Carbon Dioxide