基于水资源承载力的渭河源规模化林场植被设计面积计算

Vegetation Design Area Calculation of Weihe Source Large-scale Forest Farm Based on Water Resources Carrying Capacity

针对定西市渭河源林场规模设计中只有定性分析却无定量评估的问题,基于水资源设计承载力的概念,融合植被需水定额的算法,提出系统量化林场设计面积的方法,分别得出2016、2027年不同发展模式下渭河源林场各类植被的设计面积,并进行评估。结果表明,2016年乔木林、其他林地和草地处于恢复模式与最优模式之间,水生态压力较大,灌木林处于保护模式与恢复模式之间,水生态压力较小,今后应以扩大灌木林面积为主,同时增加其他林地类型的用水量;通过提高生产、生活的用水效率,在项目区85%的供水保证率下,2027年可承载的植被面积仍可有较大幅度提升。该方法可为类似林场规模的评估计算提供参考。

The scale design method of Forest Farm of Weihe source region in Dingxi City only have qualitative analysis and no quantitative evaluation.To solve this problem,this paper proposed a method to quantify the carrying area of forest farm design based on the concept of water resources design carrying capacity and the algorithm of vegetation water demand quota.And then it obtained the design bearing area of various vegetation in forest farm of Weihe source region under different development modes in 2016 and 2027 respectively.The results shown that in 2016,Arbor Forest,other woodlands and grasslands were belonged between the recovery mode and the optimal mode,the water ecological pressure was large;The Shrub ranged in the protection mode and the recovery mode,the water ecological pressure was small.In the future,the shrub coverage should be mainly expanded,and the water usage of other forest types should be increased;By improving the efficiency of production and life,the area of vegetation can be increased greatly under the water supply guarantee of 85%in 2027.This method can provide reference for the evaluation of similar forest farm.