湖北当阳市丘陵地区铁坚杉及其群落的研究

 本文对当阳市丘陵地区铁坚杉的分布、起源、生物学特性，生长发育规律、群落的类型、结构、更新和演替进行了研究。报道了在当阳市海拔100—393m的低海拔丘陵区有较大面积的铁坚杉的纯林和混交林。研究指出：当阳市丘陵地区的铁坚杉起源于6000万年以前，是由于未受到第四纪冰川的影响和历史上人为破坏较轻才得以保存并延续至今的。 研究还指出：铁坚杉与马尾松有十分相似的习性，容易繁殖，对环境条件的适应性强和要求不苛，寿命长，能长成大树，生长速度不低于马尾松，还具有很强的萌芽更新的能力，有一次造林多茬受益的特点。建议在其适生范围里作为一个优良的用材树种进行大规模的人工造林，同时鉴于此树种目前的数量不多，濒于危亡，建议列为三级保护对象予以保护。

A STUDY ON KETELEEI RIA DAVIDIANA AND ITS COMMUNITY IN HILLY AREA IN DANGYANG OF HUBEI PROVINCE

This article is a general study on the distribution, origin, change,biological characteristics, law of growth and development, communitytype, structure, regeneration and succession of Keteleeiria davidiana inDangyong. A large area of pure and mixed forest in the hilly area at the lowaltitude of 100-393 m is reported. Keteleeiria davidiana in hilly area in Dangyang was originated 60 mill-ion years ago. Without the damage of Quaternary glacier and little distu-rbance by human in history, it survives until today. The properties of Keteleeiria davidiana is very similar to that of Pinusmassoniana. It has easy propagation, good adaptability, and long life. Itcan grow into big trees. Single tree growth speed are not lower than thatof Pinus massoniana. The species has strong germination and regenerationability, thus several harvests are possible once planted. It is proposed to use the species as an improved timber source fnlar-ge-scale artificial forests in its adaptable region. However, the specis innow on the verge of extinction, we propose to protect it as grade 3 prot-ectd species.