基于能值理论的水资源对农业生产贡献量化分析

运用能值理论,依据水资源对农业生产贡献的特点,提出了水资源对农业生产贡献量和贡献率的量化方法,为科学量化水资源对农业生产贡献提供新思路。以许昌市为例,计算结果显示,许昌市2005~2016年水资源对农业生产的贡献量多年平均值为12.04×1020sej,折合人民币22.09×108元,贡献率为6.11%,其中地下水贡献率3.87%,占水资源贡献率的64%。许昌市水资源对农业生产贡献的变化规律分析显示,水资源对农业生产的贡献量及贡献率均呈增长趋势,且单方水贡献率随农业用水水平的提高而增加。

Quantitative Analysis of Water Resources Contribution to Agricultural Production Based on Emergy Theory

According to the characteristics of the contribution of water resources to agricultural production, based on emergy theory the quantitative method of water resources contribution to agricultural production is proposed, which provides a new idea for scientifically quantifying the contribution of water resources to agricultural production. Taking Xuchang city as an example, the calculation results show that the average annual contribution of water resources to agricultural production in Xuchang is 12.04×1020sej, equivalent to 22.09×108 yuan, and the contribution rate is 6.11%. The contribution rate of groundwater is 3.87%, accounting for 64% of the contribution rate of water resources. According to the analysis of the change law of water resources" contribution to agricultural production in Xuchang city, the contribution and contribution rate of water resources to agricultural production are both increasing, and the contribution rate of single water increases with the improvement of agricultural water use.