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.

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。

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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.

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。

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How to calculate the water invasion rate correctly while we study the performance and calculate the dynamic reserves of the gas reservoir with material balance equation is still a difficulty for long.

在利用物质平衡方程计算水驱气藏地质储量、研究气藏动态时，水侵量的计算一直是个难点。

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