The Study On Evapotranspiration And Irrigation Schedule Of Five Greenland Plants In Shenzhen

In this study, pot experiment and field survey test were both conducted. In the pot experiment, five greenland plants were selected. They were Zoysia matrella, Cynodon dactylon L., Duranta repens-cv.Dwarf Yellow, Codiaeum variegatum and Ixora chinensis. Complete randomized block design was selected in the experiment. Water treatment was divided into four gradients. There were three duplications in every gradient. The four water gradients of two turfgrass were lower water limits-45%, 45%-60%,60%-75% and 75%-100%FC. The four water gradients of three shrubs were 30%-45%, 45%-60%,60%-75% and 75%-90%FC. FC was field water capacity. The evapotranspiration of five plants was measured by weight method. Growth and physiology index of five plants were measured under four different water gradients. The reasonable water gradient of turfgrass and shrub in different month were obtained. The irrigation schedule of turfgrass and shrub were drafted. In the field survey test, daily soil moisture changes of different greenland type in road and park were measured.Pot experiment showed that daily evapotranspiration changes of five plants had a close relation with the changes of air temperature and solar radiation. The month evapotranspiration trend of five plants was higher in summer and was lower in winter. The daily and month evapotranspiration of five plants increased with increasing of water gradients. The daily evapotranspiration of shrub was higher than that of turfgrass. The physiology index of five plants were different in different month and under different water gradients, which increased with increasing of water gradients without proline content. The Crops coefficient of five greenland plants were different under four water gradients and increased with increasing of water gradients.Field survey test showed that the daily soil moisture change of field survey test were lower than that of pot experiment. The order of road greenland daily soil moisture value summerized as follows: grassland>tree-grassland>shrubland. The daily soil moisture in park greenland had no obvious rules.The irrigation schedule of Zoysia matrell and Cynodon dactylon L. were summerized as follows: the net irrigation quota were 11mm/times and 11mm/times; the total irrigation times were 70 times and 65 times; the irrigation quota were 770mm and 715mm. The irrigation schedule of Codiaeum variegatum, Ixora chinensis and Duranta repens cv.Dwarf Yellow were summerized as follows:the net irrigation quota were 21 mm/times,21 mm/times and 16mm/times; the total irrigation times were 34 times,36 times and 40 times; the irrigation quota were 714mm,756mm and 640mm.