动态经济评价模块原理及其在林分经营模型中的应用*

通过动态经济评价模块，将成本构成要素分解成材料消耗，用工消耗和资金换算单位乘子等基本元素，而用以基本元素以自变量的函数描述成本及收入核算项目，借助模块内专门设计的解码过程，通过外部文件，修改成本构成要素的分解层次和描述单位，重新设计成本核算项目的描述函数，实现了经济评价模块同林分生长模型间的柔性结构匹配。压缩数据向量及其相应算法的引入，不仅减少了内存空间的占用量，而且提高了经济评价模块的运行速度，

Principle of Dynamic Economic Analysis Procedure and Its Application in Stand Silviculture Model

A dynamic economic analysis procedure with compacted cash flow was presented.In this procedure,each investment and benefit be expressed as a function of cost elements,e.g.cost of regeneration could be described as:regeneration cost/hm²=(site cleanlabour force demand/hm²+site preparation labour force demand/hm²+planting labour forcedemand/hm²)*wage per labour per day+seedling price * stems/hm².Compacted cash flowcould be transferred to present value with multiplier[(1+i)^f-1)]/[i(1+i)^t+f-1],here i=discount rate,t=initial time of a period with equal investments and benefits,f=years of theperiod,and with which dynamic economic analysis can be done more smoothly than with ordinary cash flow.With a sophisticated data adapter,the algorithm could be easily involved into stand simulation system.Set of cost elements,recorded in a text file,could be redesignedand the functions,written in a equation library,could be recreated by user,so that a standsilviculture model would be more suitable to the occasion concerned.