Water-saving Irrgation System Research Of Bejing City Green Space

With the advancement of ecological civilization construction and the extremely scarcity of waterresources in Beijing,the present study included in-depth investigations on the irrigation conditions of Beijing's green space,especially the irrigation methods and actual irrigation water consumption of the urban districts.,Based on the survey data,make an objective assessment of the greening of the landscaping.Afterwards,combined with factors such as soil conditions,plant characteristics,topography,climate,and the choice of irrigation methods,etc.,the impact factors and survey results of greenland irrigation were used to formulate a scientific and reasonable irrigation system,and the water-saving potential of urban green space in Beijing was estimated based on the survey results.The results of the study are as follows:(1)The proportion of green space in different plant allocation patterns was 26.3%for the arbor and shrub,21.8%for the arbor,21.2%for the arbor,11.3%for the arbor,9.7%for the turf,7.7%for the shrub,and 4.0 for the shrub.%;(2)Application ratio of different irrigation methods:the proportion of sprinkler irrigation is 24.2%,the proportion of micro-irrigation is 13.3%,the proportion of waterwheel irrigation is 24.3%,and the proportion of artificial irrigation is 29.1%;(3)Irrigated time:43.3% of the irrigation water is sprayed for more than 3 hours,22.8%for 2-3 hours,20.9%for 1-2 hours,and 13.0%for less than 1 hour for irrigation.Irrigation time was more than 3 hours,accounting for 3.2%,2-3 hours accounted for 14.9%,1-2 hours accounted for 30.6%,duration was less than 1 hour,51.3%;waterwheel irrigation time was less than 15 minutes,78.6%,accounting for 18.9%for 15-30 minutes,12.5%for 30-45 minutes;artificial irrigation for 41.4%of the time for less than 15 minutes,28.6%for 15-30 minutes,and 21.3%for 30-45 minutes,The irrigation duration is greater than 45 minutes,accounting for 8.7%;(4)Irrigation frequency:The time period for irrigation more than 24 times is mainly concentrated in the months before and after September.About 50%of the various types of green lands are irrigated once a week during the summer months from June to August;residential greenbelts,community parks,and unit-owned green spaces account for On average,the number of irrigations in each season was about 30%;the green space in the park and the designated parks were higher in the seasons with more than 24 irrigations,and over 50%in the spring and autumn seasons;And the proportion of the road greenfield holding 2-3 irrigations per week reaches 80%-90%;(5)The actual amount of water used for irrigating green areas in the six districts of Beijing:According to the green area information in the statistical tables of different types of green areas and the annual average unit irrigation volume of different types of green areas in each area,the irrigation water consumption of all types of green areas in the six urban areas is estimated.The annual greenfield irrigation water consumption is about 166.8 million cubic meters;(6)Greenland water-saving irrigation system development:Determine the irrigation quota according to different soil types,plant species,soil moisture content and other factors.The specific irrigation time is determined by different irrigation methods.The number of irrigation times is the plant water consumption and irrigation quota.Ratio,the final irrigated lawn turf maximum,is 200-350mm;arbor is at least,is 44-110mm;shrub is more,is 250-300mm;the net irrigating quota of other configuration modes are 132-224mm;(7)Water-saving potential of green space in Beijing:The annual actual irrigation water consumption in the six-zone green space is approximately 166.8 million cubic meters.In the water-saving irrigation mode,the actual irrigation water consumption in the Chengliu District was about 119.2 million m3,a decrease of 46.76 million m3,which was 28.5%of water saving.:The current utilization efficiency of irrigation water is about 57.19%,which is expected to increase to 80%after achieving water-saving irrigation,which will increase the utilization efficiency of irrigation water by 22.81%.