根据黄土地区防护林生态系统水分循环的特征，提出了防护林生态系统水量平衡方程。

According to the features of water cycle in protective forest ecosystem in loess area, the equation of water balance for the protective forestry ecosystem was put forward.

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本文应用水量平衡原理，提出了计算流域耗水量的两种水量平衡方程序，并进行了实例举证和讨。

This paper, based on the principle of water balance, developed two equations for calculation of water consumption on river valley.

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通过对沼泽湿地所特有的水文特征和水量平衡方程的研究，详细地分析了三江沼泽湿地变化的影响因素。

A study on marsh wetland through their own hydrographic characteristics and water balance equation, the affecting factor on the changes of marsh wetland are analyzed in detail in the Sanjiang Plain.

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