Determination of water requirement of urban Landscape plants

The most important effects of Landscape in cities are to reduce air pollution, reduce noise pollution, adjust temperature, increase relative humidity, and absorb dust. Large amounts of urban water resources are lost due to the cultivation of different plant species together and the uncertain water requirement of these plants in the Landscape. In this study, vegetation coefficient and water requirement of shrub (Buxus, Barberry and Elaeagnus pungens), Tree (Fraxinus excelsior and Cypress) and an herbaceous species (Elymus repens) plants were estimated using two micro-climates in the Botanical Garden of Campus of Agriculture and Natural Resources, University of Tehran, using water balance and WUCOLS methods. The study was conducted for 6 months from 21 march 2018 to 22 September 2018. Based on the results of this study, the average vegetation coefficient for the whole period was 0.36 and 0.30, respectively, using the Water balance and wucols method. the estimated evapotranspiration was estimated at an average of 757 mm in the water balance method and 641 mm in the wucols method during the whole experiment period. In general, the wucols method always estimates the Less amount of water requirement for Landscape plants. According to statistical analysis, this difference was significant in six decades of experiment. According to the results of this study, application of water classification method used by Landscape species has better accuracy in estimating water requirement of Landscape plants and can be effective in reducing water consumption.