The principle of "Alternating Engineering and Shade price" is applied to estimate the economic value of water conservation caused by forest ecological system.
采用水源调节“替代工程的影子价格”原理，计算了该地区森林生态系统的水源涵养经济价值。
And because the water resources are limited, it is impossible to provide water for the agriculture unlimitedly form the surface water with the price of damaging the ecological environment.
但是，水资源有限，从地表水中不可能以破坏生态环境为代价无限止地供给农业用水。
The comprehensive agrarian land value evaluation should also include the price of economic value, social value and ecological value.
对农用地完整价值的价格评估就应当包括这三种价值货币化的经济生产价格、社会价格和生态环境价格的计算。
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