秦岭华山松与红桦混交林效益调查研究

Research and study on the economic benefits on Pinus armandii in Qinling and Betula albo-sinensis mixed forest

该文通过实地调查分析,结果表明:17年生华山松混交林,树高、胸径和材积的总生长量均比同龄纯林大,树高、胸径的连年生长量下降比纯林慢,材积连年生长量上升比纯林快。8年生华山松仅树高定期生长量比纯林大,胸径与材积定期生长量不及纯林。混交林的叶量、叶面积及单位重量的叶绿素含量均比纯林高;混交林种间根系无互相排斥现象;枯枝落叶量比相应的纯林高。

The author conducts field-survey analysis on different tree species at different ages. The results are as fol- lows： For 17 years＇ Pinus armandii mixed forest, their height, DBH and total volume are respectively higher and more than pure Pinus armandii and Betula albo-sinensis, and so are the growth rates. The height growth of 8 years＇ Pinus armandii in a certain period of time are more than pure forest, while its growth of DBH and total volume are less than pure forest. The number, area and chlorophyll of leaves of mixed forest are more than those of pure forest; there is no repulsion between different species of mixed forest; the number of fallen leaves and dead branches of mixed forest are also more than their counterparts.