Study on Water Consumption Characteristics of Shifosi Constructed Wetland Cattail Community Evapotranspiration

Penman-Monteith model and single crop coefficient method were used to calculate the wetland cattail whole growth period daily actual evapotranspiration in Shifosi,the free water surface evaporation of each period and the impact of community cattail actual evapotranspiration and surface evaporation of meteorological factors were analyzed using partial correlation method.The results showed that the cumulative growth period evapotranspiration of cattail unit area was 607.96 mm,the overall downward trend of evapotranspiration were first increased and then decreased,and its maximum intensity of stabilize evapotranspiration reached 4.52mm/d,which was a critical period of ecological water demand,the corresponding full stages in the water evaporation was 560.11 mm,and evapotranspiration coefficient was 1.09,indicating that the presence cattail increased the diffusion of water wetlands;transpiration and evaporation were affected by different growth stages of meteorological factors in different degrees,mainly the solar radiation and the wind speed.