宜昌市郊不同龄级柏木人工林下植物区系组成变化趋势

Trend of Floral Composition in Different Age-classes of Undergrowth Vegetations in Cupressus funebris Plantations in Yichang Suburb

对湖北宜昌市郊3个龄级柏木(Cupressus funebris)人工林下植物区系组成进行了研究,结果表明:从幼龄林、中龄林至近熟林阶段,林下植物科属种数量均呈增加趋势,草本植物、灌木和乔木的种数也呈增加趋势,但常绿乔木种几乎没有增加;3个龄级柏木人工林下均以双子叶植物为主,并且种数增加趋势明显,蕨类植物种类增加不多,但趋于在草本层占绝对优势;属的分布型变化趋势为以热带分布属占优势;趋向热带分布属与温带分布属数量接近。

The changes of floral composition in 3 age-classes of undergrowth vegetations in Cupressus funebris plantations in Yichang suburb were studied.The results showed that,from young-age plantation and middle-age plantation to near-maturation plantation,family,genera and species of undergrowth vegetations present increasing trend,and herbaceous species,shrub species and arbor species also present increasing trend,but evergreen arbor nearly not increased.Undergrowth vegetations of 3 age-classes Cupressus funebris...