Research On Construction Standard For Water Saving Nursery In Beijing

Nursery is the base for breeding and nurturing nursery stock,it’s a significant part of urban green space.Since the Olympic Games bid in Beijing,a variety of forestry production nature of the rapid development of business units.However,the number of nursery does not represent the rate of urban greening,water consumption of forest cultivation is large.Thus leading to people doubt that if it’s right to built forestry production enterprises in water shortage areas.So far,the domestic research on nurseries ainly concentrated in nursery technology and overall planning and construction.There is little research on the correlation from the perspective of water saving irrigation,lack of systematic theoretical planning.Based on the opportunity that National Development and Reform Commission promulgated the "Water Conservancy Reform and Development "thirteen five"plan",in the field of forestry development it will develop Beijing local standard "Standardized nursery water-saving construction "as an important content of low-carbon and conservation-oriented forestry construction.Based on the sample survey of the whole nursery in Beijing,this study draws out the parameters,technical approaches and standards for the construction of water-saving nursery in Beijing by analogy analysis and the transformation and design of the actual forestry nursery.The basic conclusions are as follows:(1)Beijing nursery covers an area of mainly concentrated in the 200-500 acres,more than 1,000 acres of nurseries are mostly state-owned nursery;small state-owned nursery is generally based on scientific research and practice;most nurseries produce landscaping seedlings.So the nursery type is also the majority of transplanted large seedlings.Beijing nurseries are generally use groundwater,but most of the nurseries don’t install water meters for statistical annual water use.Nurseries in different nature and different are very different in regions water prices and electricity costs.(2)Nursery automatic control system and water storage device are not universal yet.Underground pipe network water has been extensively spreaded,the plastic pipe are used commonly.70%of the nurseries use the way of flood irrigation,part of the cultivation of annual or planted fruits and vegetables nurseries use sprinkler irrigation,micro-irrigation and other irrigation methods,there are only three state-owned nurseries use small pipe outflow irrigation.(3)Beijing water-saving nursery planning and construction elements include four aspects,they are nursery site selection,zoning,irrigation system and nursery water management system.Nursery site from four aspects to consider,the location,soil conditions,water and pests and diseases.Nursery zoning including the division of production land and auxiliary land.Nursery irrigation systems are divided into water sources,head hinge,water supply systems and vater distribution systems,TOPSIS method is used to develop water saving irrigation management system index.(4)The irrigation water quota can be determined by the different physiological and ecological characteristics of the nursery stock,the water demand of each period,and the different climatic conditions and seedling growth.According to the wilting coefficient of different soil types,the field water holding capacity can determine the effective range of soil water content,and calculate the water quota of seedlings.