河道生态基流保障引起的农业损失量计算

为了科学协调水资源短缺地区农业用水与生态基流的矛盾问题,推动生态基流保障工作开展,从优先保障生态基流后农业受到影响的角度出发,确定了不同保障水平下的农业损失量。以渭河干流宝鸡段为例,定量计算了生态基流调控值在5～10 m~3/s之间时宝鸡峡灌区的农业产值损失与产量损失,并分析了生态基流保障前后保障率变化情况。结果表明:生态基流调控值在5～10 m~3/s之间时,平水年农业产值损失在1. 04×10~8～2. 54×10~8元之间,枯水年农业产值损失在2. 99×10~8～4. 06×10~8元之间,特枯年农业产值损失在4. 78×10~8～6. 61×10~8元之间。减少农业灌溉引水后,河道生态基流保障率明显提高。

Calculation of agricultural loss caused by river ecological basic flow protection

In order to scientifically coordinate the contradiction between agricultural water use and ecological base flow in water shortage areas, and to promot the ecological base flow guarantee work, this paper determines the amount of agricultural losses under different levels of protection from the perspective of the impacted agriculture from ensuring the ecological base flow. Taking the Baoji section of the Weihe River as an example, the agricultural output value loss and yield loss in Baojixia Irrigation District were calculated quantitatively when the ecological base flow regulation value was between 5 and 10 m³/s, and the change of the protection rates before and after the ecological base flow protection was analyzed. The results showed that when the ecological base flow regulation value was between 5 and 10 m³/s, the agricultural output value loss were 1.04×10⁸-2.54×10⁸ yuan, 2.99×10⁸-4.06×10⁸ yuan and 4.78×10⁸ - 6.61×10⁸ yuan, respectively in normal year, dry year and extremely dry year. The river ecological base flow protection rate had significantly improved, when the diversion for agricultural irrigation reduced.