| Forest is a valuable nature resource. Currency of forest yield is the currency expressed total of forest resource matters and forest asset value. The studies of theory and technology about forest currency yield forcast is indispensable among the forest management and decision-making. It is important in theory, and has practical prospect in application.387 standard of Fukien cypress plantion and native distributing area were selected in 25 counties of Fujian by the principle of typical selection. We analysed tree stem, collected data of wood price, produce and management cost,and techn-economic index. The changeable parameter taper equation were established, and the parameters were solved throught immunity evolve algorithm. We found the fitting model of forecast inside bark diameter at breast height and height curve for Fukien cypress. It is a high precision equation inapplication. Threr are no significant difference between the equation and actual values.The one-dimensional (diameter at breast height) and two-dimensional(diameter at breast height,tree height) currency yield table were established by volume price of different diameter grade and method of forecasting wood volume. Based on standard wood price, one-dimensional currency yield table must be used in the area where wood price is the same as the standard wood price, otherwise, currency yield table must be changed or given a modify index. One-dimensional currency yield table were applied in Forest assets evaluation, the average price of different tree is important.We have analyed the wrong steps about normal method of calculating stand cumulation. There are lower stand coumulation of 10% in the normal method with using stand average diameter at breast height and average stand tree height as a single stem's. We propsed a method of caculating stand cumulation with single stem volume distributing in different diameter grade. The standard currency yield table were based on the stand average price and stand volume yield. |
