Application of Integrated Multi-source Root-zone Drip Irrigation Technology in Economic Forestry

The economic forestry root grows deeply vertically and also distributes widely horizontally.However,the irrigation water of surface point-source drip irrigation could not infiltrate into the layer that the most effective roots distribute in.Also,the issue of emitter clogging impedes the traditional subsurface drip irrigation development.To transport the irrigation water to the root-zone precisely,the subsurface drip irrigation equipment is developed and its benefits are analyzed,including the characteristics of anti-clogging,easy maintenance and the theory of multi-variable technologies.The improvements in technologies and benefit of the surface drip irrigation are compared with the subsurface single source drip irrigation.It is confirmed by different irrigation experiments that the three kinds of irrigation methods,including drip irrigation,single source and multi-source root-zone drip irrigation,could enhance the yield by 10 375,12 445 and 12 530 kg/hm2 more than that without irrigation.In addition,the water use efficiency(WUE) of drip irrigation,single or multiple source subsurface irrigation is enhanced by 50%,57.1% and 58.8%,respectively.And the net income of single or multiple source subsurface irrigation is enhanced by 10 958 and 13 550 Yuan/hm2 than that of surface irrigation.Finally,the depreciation periods of surface and subsurface drip irrigation are 8 and 12 years,respectively.