Abstract
The construction of ecological irrigation districts is of great significance to protect the Yellow River ecology and achieve sustainable development of the local ecological economy. Taking the ecological irrigation district of Helan County as the study area, a health evaluation index system of the irrigation district was established, including three primary indexes of ecological environment, modernization level, and agricultural production and benefit, and 20 secondary indexes. Then, the Topsis method, entropy weight evaluation method, fuzzy pattern recognition model, and variable fuzzy model were used to evaluate the health of the Helan ecological irrigation district. In order to avoid the one-sidedness of the evaluation results of a single evaluation method, a combined evaluation method named deviation maximization combined evaluation method was used to combine each single evaluation result. The evaluation results by the combined evaluation method showed the following: (1) The ecological health of Helan irrigation district had a trend of becoming better from 2007 to 2016. (2) The grey correlation analysis showed that the soil salt content, groundwater depth, canal lining rate, ratio of efficient water-saving irrigation area, information level of the irrigation district, water productivity, agricultural unilateral aquatic output value, irrigation water consumption per mu, and coefficient of effective utilization of farmland irrigation water were closely related to the evaluation results. (3) In order to effectively improve the ecological health of Helan irrigation districts, it is necessary to reduce soil salt content and groundwater salinity, increase canal linings, promote water-saving irrigation measures, and agricultural information construction, etc.
Highlights
The ecological irrigation districts arose with the integration of ecological problems in the modern agricultural production system
The weights of each primary index and secondary index of EWM calculates as follows: 1 the data of the secondary indexes from 2007 to 2016 are standardized; 2 the entropy values and index difference coefficients of the secondary indexes included in the ecological environment, modernization level, and agricultural production and benefit are calculated according to Equation (1); 3 the index difference coefficients of the 9 secondary indexes included in the ecological environment of the irrigation district are brought into
The weight calculated by EWM is assigned to 0.8, and the weight calculated by analytic hierarchy process (AHP) is 0.2, for the purpose of eliminating the one-sidedness of the calculation results of one weight calculation method, fully considering the importance of indexes reflected in historical data, and reducing the impact of human factors
Summary
China is a country with a large population and agriculture. agricultural modernization is one of the goals of national modernization. Apart from modernization, the construction of an ecological civilization and sustainable development are both highly valued by China. Irrigation districts, which exhibit an important infrastructure of agriculture and rural areas, play an important role in guaranteeing national food security, promoting farmers’ continuous income increase, improving the rural ecological environment, and balancing urban and rural development [1]. The ecological irrigation districts arose with the integration of ecological problems in the modern agricultural production system. It greatly solved the ecological environment problems caused by traditional irrigation districts and became the main development direction of agricultural irrigation district construction. The study of ecological irrigation districts mainly focuses on its concept and evaluation.
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