桉树与厚荚相思混交林经济效益分析

采用国际惯用的财务分析方法，对桉树与相思混交林进行了经济效益分析，结果表明∶尾叶桉（无性系ＭＬＡ）与厚荚相思行间混交纯利润最高达２１８８３．６２元／ｈｍ２，比带状混交提高４２．１％，比尾叶桉纯林提高３３．５％；行间混交、带状混交和纯林内部收益率分别为５１．９％，４９．４％和５１．６％；投资回收期行间混交为５．１年，其余为５．２年。雷林１号桉（实生苗）与厚荚相思混交，行间混交林纯利润最高，达１２００１．５８元／ｈｍ２，比带状混交林提高４６．４％，比纯林提高４９．３％；行间混交、带状混交、纯林的内部收益率分别为３９．４％，３８．２％和３７．７％；投资回收期均为５．３年。

ECONOMIC BENEFITS ANALYSIS OF EUCALYPTS\= AND ACACIA CRASSICARPA MIXED FORESTS

The paper analyses the economic benefits of Eucalypts and Acacia crassicarpa mixed forest by international normal methods. The results show that the Eucalyptus urophylla and A. crassicarpa interrow mixed forest has the most net income (21 883.62 yuan/hm2). It is 42.1% and 33.5% more than that of mixture by strip and of pure ones respectively. The IRR of the interrow mixed forest, of the mixture by strip and pure one are 51.9%,49.4% and 51.6% respectively. The period for recovery of investment of the interrow mixed forest is 5.1 years and of the others is 5.2 years. The E.leizhouensis No.1 and A. crassicapa interrow mixed forest has the most net income (12 001.58 yuan/hm2). It is 46.4% more than that of mixture by strip forest and 49.3% more than that of pure ones. The IRR of these three forests are 39.4%,38.2% and 37.7% respectively. The period for recovery of investment of these three forests is 5.3 years.