The Analysis Of Ecological Water Requirement Of The Overlapping Vegetation In The Otinday Sandy Area

Have already become the ecosystem system restrict factor of the healthy and economic development in the our country water resources. It is very important for The reasonable makes use of the resources of waterand reducing available irrigation water lost and promoting water utilization efficiency to Vegetation correctly the ecological wa-ter requirement.This study based on the two year's experimental data of nature crown level Over-lap vegetation located at The NanShangLiang region of Duolun Banner from the research program, A study of Scientific Allocation of Water Resources for Vegetation Construc-tion in The Sandy Area Between Beijing and Inner Mongolia, supported by National Natural Science Foundation of China to study the relationship between Overlapping vegetation 's ecological water requirement as well as with many kinds of factor rela-tions with emphasisEcological water requirement of the overlapping vegetation consist of water re-quirements in gowing season an non-growing season. Ecological water requirement in growing season was composed by the transpiration which is used for keeping life and by the evaporation which are important component of water balance in the root zoon of the ecological niche. The transpiration of the overlapping vegetation can be called as the life water requirement and the evaporation of the soil under overlapping vegetation can be called as ecological niche water requirement . Ecological water requirement in non-growing season only consiist of water requirement of ecological niche for spending winter time.The main contents of the papers are as follows:(1) Daily reference evapotranspiration ETo of millet harvested fresh have have been calculated.(2) This paper based on the field experimental data from 2005 and 2006 to simulate the ecological water requirement of the overlapping vegetation in different hydrological years using dual crop coefficient approach presented in the FAO-56 .(3) To validity test of the Overlapping vegetation 's ecological water requirement result. requirement in Different hydrology year,obtains with the environment factor and the physiological factor quota relations.The author wants to master the usage of water and the process of hydrology by quantitative and qualitative analysis's subject to ecological water requirement and pro-vide compositive decisions to optimize the collocation of water&soil resources,and im-prove the quality of environment. At the same while,the author want to provide with academic dependence for the structural adjustments of agriculture,forestry and stock-breeding as well as the adjustment for inside-constructure of agriculture,and promote the sustainable development and help settle some questions about country,farmers and agri-culture by quantitative analysis's subjecting to ecological water requirement of various types of vegetation.