马尾松纸浆材林优化栽培密度经济分析

摘要

Based on the growth harvest model system of Masson pine plantaiton,the best economical planting densities at 14,16 and 18 site index were selected aiming at the biggest NPV and IRR among several hundreds of culture models of Masson pine plantation for pulp,and the optimal age of final cutting was determined by using the marginal analysis.The results showed that Masson pine plantation for pulp should select bigger density compared with that for timber,and the final cutting age should be earlier;The best planting desity was between 4 000～5 000 trees/hm2， and cutting age 15～17 a.%依据马尾松人工林生长收获模型系统，在数百个技术上可行的马尾松纸浆材林栽培模式中，以NPV和IRR最大为主要目标进行选优，并用边际分析法选出14、16、18指数级经济上最优的初植密度，最后用边际分析法确定最优初植密度的最优主伐年龄.结果表明：相对于建筑材林而言，马尾松纸浆材林要取得较好的经济效益，应适当密植，主伐年龄应相应提前；每公顷最优初值密度为4 000～5 000株，最优主伐年龄为15～17 a.