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作 者 ：王传华,魏斌,李俊清*

期 刊 ：生态学报 2009年 29卷 9期 页码：4681~4692

关键词：低山丘陵区；马尾松枫香林；空间分布格局；幼苗更新；演替；

Keywords:hilly region, pine-sweet gum mixed forest, distribution pattern, seedling regeneration, Succession,

摘 要 ：长江中下游低山丘陵地区是一个植被曾经受到破坏的生态脆弱区，枫香林和马尾松枫香林是该地区的重要植被类型，对于维持该地区的生态安全具有重要意义。对地处鄂东南低山丘陵地区的枫香林和马尾松枫香林的群落结构及其主要乔木的实生更新进行了研究，结果表明：(1)该地区枫香林和马尾松枫香林群落的乔木和灌木层物种组成存在差异；(2)枫香林中的枫香种群不能实现持续地实生更新；马尾松枫香林的马尾松是一个年龄为25~30a的同生群，而枫香则为一个增长种群； (3)对马尾松、枫香、化香、合欢4种主要乔木实生幼苗的种间关联、生长发育规律、空间分布格局的分析表明：①在4种幼苗形成的6个种对中，只有马尾松和化香间呈显著的负关联（p≤0.01），其它种对间不存在明确的关联关系。②马尾松、枫香、化香、合欢的幼苗均呈聚集分布，其中枫香幼苗在高生长过程中趋向于随机分布。③ 4种幼苗的高生长速率表现出不同的规律，其中马尾松和枫香呈“J”型加速增长；化香和合欢幼苗的高生长速率分别在d、e级幼苗出现拐点，其幼苗高生长为“S”型增长\.该地区的植被演替呈现枫香为主的落叶阔叶树种取代马尾松的趋势，但是枫香林的演替趋势还有待进一步研究。

Abstract:The south-east hilly region of Hubei Province, located at the middle and lower reaches of Yangtze-river, is an ecologically degraded and frail area that needs to be restored and conserved. Chinese sweet gum (Liquidambar formasana) forest and pine (Pinus massonaina)-sweet gum mixed forest are two main forest types in this region. To reveal the vegetation restoration mechanism of this region, a study on regeneration and succession was conducted in these two forest types. The results indicated that: (1) the difference of species composition between the two forest types was significant; (2) in pine-sweet gum mixed forest, the pine population was a cohort aged from 25 to 30 years, which could be taken as a maturing population, while the sweet gum population could be viewed as an increasing population. At the same time, sweet gum population in the sweet gum forest could be a decreasing population, because there were no seedlings under their own canopy. (3)seedlings regeneration study of 4 dominant tree species (pine, Chinese sweet gum，Dyetree (Platycarya strobilacea) and Wild Siris (Albizzia julibrissin) ) showed that: ① there was no inter-species association in each pair of the 4 species, except that pine and Dyetree showed a significantly negative association(p≤0.05); ② the distribution pattern of Chinese sweet gum changed gradually from clump to random pattern with growth, while the other 3 species always showed a clump distribution pattern; ③the seedlings of the 4 species showed different growth patterns: the main branch growth increment of Dyetree and Wild Siris seedlings decreased earlier than that of pine and Chinese sweet-gum. In conclusion, in the south-east hilly region of Hubei Province, there was a tendency that sweet gum would take the place of pine, while the succession of sweet gum forest was a question for further study.

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