常绿阔叶林演替过程中马尾松消退的原因

通过对浙江天童国家森林公园常绿阔叶林不同演替阶段的群落生态学调查，确认马尾松（ＰｉｎｕｓｍａｓｏｎｉａｎａＬａｍｂ．）属于常绿阔叶林演替过程中的消退种。为了揭示马尾松在群落演替过程中的消退原因，对各演替阶段群落中的生态因子，特别是光照强度的实地测定，得知马尾松群落内光照强度过低，常使马尾松更新苗处于光补偿点之下，难以正常生长。成树在演替过程中的衰退则是由于其它常绿阔叶树种，如木荷（ＳｃｈｉｍａｓｕｐｅｒｂａＧａｒｄｎ．ｅｔＣｈａｍｐ．）、栲树（ＣａｓｔａｎｏｐｓｉｓｆａｒｇｅｓｉＦｒａｎｃｈ．）等耐荫树种的抑制而使其物质合成能力逐渐减弱，物质分解能力逐渐加强，以致在常绿阔叶林演替的过程中逐渐消失。

DECLINING CAUSES OF PINUS MASSONIANA IN THE PROCESSES OF SUCCESSION OF EVERGREEN BROAD LEAVED FOREST

Through the synecological investigation in different community successional stages of evergreen broad leaved forest of Tiantong National Forest Park in Zhejiang, the authors found that Pinus massoniana Lamb. is the declining species in the successional course of evergreen broad leaved forest. For revealing the declining causes of P. massoniana, through measuring the habitat, especially the sun light intensity, the authors have gained the knowledge that the low sun light intensity in seral often made the seedlings and young trees of P.massoniana live in a condition below the compensation point of light;and the interference of other shade tolerant evergreen broad leaved species gradually impeded the growth of the adult trees of P.massoniana by weakening the ability of its material synthesis and intensifying the ability of material decomposition along with the community succession, and withered away gradually.