| Irrigation water use efficiency is the primary indicators to assess not only the irrigated agricultural water use efficiency, and is but asle one of the basic parameters of Irrigation water management and water conservancy construction, it has a very important role in guiding the work of agricultural water-saving irrigation. In this paper, Hetao irrigation area for the study, in-depth analysis of different scale irrigation water use efficiency of different laws in Hetao Irrigation and water saving potential analysis of different scales shrink under field water-saving measures, the main contents and conclusions are as follows:1, we use "field measurement method," measures field water use efficiency and analyzes Diversity law of field water use efficiency in Hetao Irrigation District, This paper calculates80cm and100cm field water use efficiency of the wulanbuhe, Jiefang gate, Yongji, Yi Chang,Wulate, and hetao irrigation area are:0.7441,0.7832,0.7368,0.7341,0.7250,0.6756,0.7250and0.6756,0.8547,0.8236,0.8125,0.7959,0.7452,0.7959;This article confirmed different crops and the same crop of the hetao irrigation area in the same area field water use efficiency decreases with increasing field area, illustrates the shrinkage (reduce strip block size) can effectively improve the field water use efficiency, thus it can save water use in the field;Illustrates the field water use efficiency of the different regions decreases with increasing of field area in hetao irrigation area, and the soil from the change of the clay to loam and sandy loam decreases accordingly.2, this paper uses "the Head-tail Calculation Method", measure irrigation water use efficiency, and analyzes Diversity law of the efficiency of irrigation water use, Calculated in this paper, the measurement method of fore and aft the Ulan Buh, Jiefang gate, Yongji, Yi Chang,Wulateand irrigation water use efficiency of hetao irrigation area are as follows:0.4067,0.4415,0.4366,0.4415,0.4366,0.3928and0.3947;Illustrates different scales of five overall irrigation field irrigation water use efficiency from upstream to downstream presents the downward trend, in the hetao irrigation area,although Ulan Buh irrigation fields in the upstream, but irrigation water use efficiency is relatively low;Confirmed the fore and aft analysis method for large irrigation area is practical;Proved (scales) irrigation area, the greater the efficiency of irrigation water is not necessarily is smaller, and irrigation system of irrigation area has certain correlation.3, the paper analyzes the different scales Hetao Irrigation water use efficiency of law and to improve the water-saving potential Hetao Irrigation District, made their own irrigation system architecture Hetao Irrigation water saving reform a priority order, This paper confirms the hetao irrigation irrigation water efficiency with different scales, the greater the efiiciency of irrigation water is smaller;4,Analysis the hetao irrigation efficiency of different scales on regional scale irrigation water brake irrigation field the biggest change of liberation, the second is WuLanBuHe domain, and the change of the liberation of brake is essentially the same, the last is permanent economic domain, righteousness long irrigation and region irrigation domains in turn reduce;Confirmed the hetao irrigation canal system backbone project construction quality and irrigation management level of the serious influence of hetao irrigation area water conditions, improve the quality of hetao irrigation canal system backbone project construction and irrigation management level, to improve the potential for water saving in hetao irrigation district, and according to the hetao irrigation irrigation system structure itself, should be the priority and liberation WuLanBuHe irrigation region of the brake of water-saving irrigation fields.5, Hetao Irrigation District in shrink-saving measures, the paper analyzes the potential variation of water-saving irrigation area at different scales, the proposed reduction in the Hetao Irrigation District water conservation measures at different scales in the order of priority reconstruction, Analyzed in this paper to the potential for water saving in hetao irrigation area through the narrow strip check size, different scales should first reform the righteous long irrigation domain, the domain and the liberation of brake and filling Ulan Buh irrigation field;Different scales should first reform the righteous long irrigation and Ulan Buh irrigation domains;Zong and consideration, should carry on the transformation of order for long irrigation, Ulan Buh domains, liberation brake domain, economic domain, and region filling and domain.This paper confirms the field water saving potential of small scale does not represent the irrigation system, field, such as water-saving irrigation area and basin potential;Large-scale water-saving potential and is not a simple small scale water saving potential of the accumulative sum.Later for managers and relevant government departments to provide irrigation water conservation strategy decision theory basis, the water saving potential of scale effect must be taken into consideration. |
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