喜树与南方红豆杉混交群落生活史型谱特征

研究了不同生境条件下喜树和南方红豆杉混交群落中喜树和南方红豆杉的生活史型谱特征。结果表明，喜树和南方红豆杉在S生活史型得分和比例均为0。喜树和南方红豆杉生活史型V主成分得分均以山地2最高，而纯林的生活史型V主成分得分最低，C也表现为山地2最高，而纯林最低。喜树种群的生活史型比例按照从山地、坡地、平地、纯林排序，V型比例逐渐上升而C型比例逐渐下降的趋势，这就构成了混交群落中喜树种群的生活史型谱。南方红豆杉种群的生活史型谱特征，主要表现为山地2和坡地V型比例最小，而C型比例最大，纯林种植中V型比例较高，而以纯林1的V型比例最高，C型比例最小。

Characteristics of Life Cycle form Spectrum of Camptotheca acuminate and Taxus walichiana var. maimnei Mixed Communities

The life cycle form spectrum of Camptotheca acuminate and Taxus chinensis var. mairei in the mixed communities were studied. The results showed that the score and proportion of both are 0 in the S life cycle form. The highest principal components score of V life cycle form among C.acuminate and T.chinensis var. mairei communities is mountain plot 2, pure forest V life cycle form is the lowest, C life cycle form is the same. The life cycle form proportion of C.acuminate community, according to mountain plot, sloping land plot, flat land plot and pure forest plot, the general trend is V life cycle form rise and C life cycle form drop, which compose the life cycle form spectrum composition of C.acuminate mixed communities. The T.chinensis var. mairei community life cycle form spectrum showed that the V life cycle form is the lowest between mountain plot and sloping land plot and the C life cycle form is the highest. However, the V life cycle is the highest among the pure forest plot and the C life cycle form is the lowest.