作 者：
丁易;路兴慧;臧润国;黄继红;杨秀森;周亚东;黄勇;冯业洲
单 位：
国家林业局森林生态环境重点实验室;海南省霸王岭林业局;海南大学农学院
摘 要：
[目的]通过对海南霸王岭林区的热带天然次生林抚育技术试验,了解抚育对次生林群落组成和结构的影响。[方法]通过对30个热带天然次生中龄林(60年)固定样地(50 m×50 m)进行抚育前后的森林调查数据,利用配对t检验、非维度多尺度标定(NMS)和指示种分析等统计方法,比较个体数量、物种多样性、群落物种组成、指示种、优势种和群落径级结构在抚育后的变化特征。[结果]表明:经过抚育后群落上层物种(胸径≥5 cm)和下层(1 cm≤胸径<5 cm)个体密度显著减少了24.9%和59.9%,胸高断面积显著减少了13.1%和54.9%。抚育前后上层和下层树木径级分布结构均没发生显著变化,但呈随径级增加抚育比例减小的趋势。与抚育前的群落物种相比,抚育后的次生林上层和下层的物种组成无显著变化,上层树木物种密度减少了15.1%,但物种丰富度(排除密度效应后的物种密度)和香农指数无显著变化。抚育对下层树木的影响更加显著,其中,物种密度、物种丰富度、香农指数显著减少了40.3%、15.1%和11.1%。经过抚育后,上层指示种多度平均减少了85.6%,优势种多度平均减少了6.4%;下层指示种多度平均减少了85.9%,而优势种多度平均减少了35.1%。[结论]通过中幼林综合抚育措施,热带低地雨林次生林中短寿命先锋种数量显著减少,降低了抚育后先锋种对保留目的种的竞争强度,从而为加快热带次生林的生态功能恢复和实施森林经营管理奠定了重要基础。
译 名：
Effects of Tending on the Community Structure and Species Diversity of a Tropical Natural Secondary Forest
作 者：
DING Yi;LU Xing-hui;ZANG Run-guo;HUANG Ji-hong;YANG Xiu-sen;ZHOU Ya-dong;HUANG Yong;FENG Ye-zhou;Institute of Forest Ecology,Environment and Protection,Chinese Academy of Forestry,Key Laboratory of Forest Ecology and Environment of the State Forestry Administration;Co-Innovation Center for Sustainable Forestry in Sounthern China,Nanjing Forestry University;Bawangling Forestry Bureau of Hainan Province;College of Agriculture,Hainan University;
关键词：
community structure;;disturbance;;forest recovery;;dominant species;;succession
摘 要：
[Objective]To determine the effects of forest tending on the community combination and structure of secondary forest by tending trial on a tropical natural secondary forest in Bawangling forest region,Hainan Island.[Method]Based the forest survey data on 30 permanent plots( 50 m × 50 m) of 60-year-old tropical secondary forest before and after tending,the variations in stem density,species diversity,community composition,indicatorspecies,dominate species and stem diameter class structure were compared by using pairs t-test,non-metric multidimensional scaling,and indicator species analysis. [Result]The results showed that the stem density in overstory( dbh≥5 cm) and understory( 1 cm≤dbh < 5 cm) reduced by 24. 9% and 59. 9%,and the basal area decreased by 13. 1% and 54. 9% after tending. The stem size distribution structure was not significantly changed after tending,but showed a tendency as tending proportion reduced with stem diameter increased. Both the community species compositions in overstory and understory did not significantly change after tending. The overstory tree species density decreased by 15. 1%,but the species richness( species density after excluding stem density effect) and Shannon diversity index did not change significantly. The effect of tending on understory trees was more significant and the species density,species richness,Shannon diversity index significantly reduced by 40. 3%,15. 1% and 11. 1%. The abundances of indicator species and dominant species of overstory trees respectively reduced by 85. 6 and 6. 4% in average. For the understory species,the abundance of indicator species and dominant species respectively decreased by 85. 9% and 35. 1% in average. [Conclusion]After tending,the number of short-lived pioneer species were significantly reduced. This effect consequently decreased the competition intensity from pioneer species and proved important foundation for accelerating ecosystem functioning recovery of tropical secondary forest and conducting forest management.
