杉木拟赤杨混交林林分结构和生产力

杉木拟赤杨混交林林分结构及其生产力的研究结果表明：杉木拟赤杨混交林是具有较高生产力，值得南方林区推广的一种针阔混交模式。林分蓄积量以３：１带状混交的最大，卿次为１：１行间混交，１：１株间混交最小；７年生３：１带状混交林林分蓄积量５９．８７ｍ３／ｈｍ２、叶面积指数７．０４、叶净同化率７．１３ｔ／ｈｍ２，分别比杉木纯林提高７．２４％、９．４９％和１６．３１％；混交林林分具有一定成层性，其林分结构比杉林纯林更有利于生物量的积累，提高出材率．

Stand Structure and Productivity of the Mixture of Cunninghamia lanceolata and Alniphyllum fortunei

A comparative study was made on stand structure and productivity between the pure stand of Chinese fir and it's mixtures. The results show that the stand stock of the mixture(Cunninghamia lanceolata 3:Alniphyllum fortunei1),Which is 59. 87 m￣3/hm￣2, is higher than other proportion mixtures and it's LIA,net production are 7. 04,and 7. 13 t/hm￣2 respectively,which are both higher than that of pure stand;that the proportion of net production on stem of the mixture is more rational than that of pure stand of Chinese fir,which enable the mixture to field more out-turn than the pure stand. As a result,the mixture possess a stronger productivity than the pure stand of Chineses fir.