海南岛3个林区热带云雾林植物多样性变化

doi:10.17521/cjpe.2016.0021

摘要/Abstract

摘要：

以分布在海南岛西部(霸王岭国家级自然保护区, 21个样方)、西南部(尖峰岭国家级自然保护区, 12个样方)和中部(黎母山省级自然保护区, 15个样方)的热带云雾林为研究对象, 研究α及β物种多样性、功能多样性、谱系多样性的变化, 为植物多样性的保护提供科学依据。结果表明: 尖峰岭群落树木个体多度、物种丰富度最大, 黎母山群落树木个体多度、物种丰富度最小; 黎母山群落间物种组成差异最大, 霸王岭群落间物种组成差异最小, 海南岛霸王岭(西部)、尖峰岭(西南部)和黎母山(中部) 3个林区热带云雾林物种多样性差异可能与空气温度和相对湿度有关。尖峰岭群落内功能丰富度、Rao’s二次熵最低, 功能均匀度最高, 群落间平均成对性状距离最小, 反映群落构建主要受环境筛影响; 霸王岭群落Rao’s二次熵最高, 功能均匀度最低, 群落间平均成对性状距离最大, 反映群落构建主要受限制相似性影响; 黎母山群落内功能丰富度最高, 群落间平均最近性状距离最大, 表明限制相似性在黎母山热带云雾林群落构建中的作用更重要。霸王岭群落内谱系多样性、物种间平均最近相邻谱系距离均较大, 反映物种间谱系关系趋于发散; 黎母山群落内谱系多样性、物种间平均成对谱系距离及群落间平均成对谱系距离均最小, 反映物种间谱系关系趋于聚集; 而尖峰岭群落内物种间平均成对谱系距离、群落间平均成对谱系距离最大, 但物种间平均最近相邻谱系距离最小, 反映物种间谱系关系既具有发散又具有聚集的共存格局。因此, 海南岛热带云雾林群落植物多样性变化格局与环境及物种间相互作用有关。

关键词: 物种多样性, 功能多样性, 谱系多样性, 热带云雾林, 海南岛

Abstract: Aims

We explored α and β species diversity, functional diversity and phylogenetic diversity distribution patterns in three tropical cloud forests along environmental gradients in air temperature and precipitation.

Methods

We sampled plots in three tropical cloud forests which are located in the west (Bawangling, 21 plots, BWL), the southwest (Jianfengling, 12 plots, JFL), and the central of Hainan Island (Limushan, 15 plots, LMS). We collected species data and functional trait data including plant height, specific leaf area, chlorophyll content, leaf thickness and wood density. We assessed the differences within- and among-community species diversity, functional diversity and phylogenetic diversity in these three tropical cloud forests using the Kruskal-Wallis test.

Important findings

The tropical cloud forests in JFL had the highest species abundance and richness whereas the lowest in LMS. However, the Bray-Curtis and Jaccard dissimilarity coefficients showed the opposite distribution patterns (i.e. the highest in LMS whereas the lowest in BWL). Distinct distribution patterns in species diversity across the three tropical cloud forests may be explained by the air temperature and relative humidity. The functional evenness (FEve) within communities was the highest while functional richness (FRic), Rao’s quadratic entropy (RaoQ) and the mean pairwise trait distance among communities were the lowest in JFL, indicating that habitat filtering plays an important role in community assembly. BWL had the highest RaoQ and mean pairwise trait distance among communities, and the lowest FEve, which demonstrated that limiting similarity would be prevalent in forest communities assembled. LMS had the highest FRic within communities and mean nearest trait distance among communities, leading to a limiting similarity influencing forest communities. BWL had the highest Faith phylogenetic diversity (PD) within communities and mean nearest phylogenetic distance among communities, reflecting an overdispersed pattern in phylogenetic structures. LMS had the lowest PD and mean pairwise phylogenetic distance within and among communities, suggesting that a clustered pattern in phylogenetic structures. The mean pairwise phylogenetic distance within and across communities were the highest in JFL while the mean nearest phylogenetic distance within communities was the lowest, indicating that phylogenetic clustering and overdispersion patterns co-occur in this forest. We conclude that both plant species interactions and environmental filtering determine the distribution patterns of plant species diversity, functional diversity and phylogenetic diversity both within and among three tropical cloud forests in Hainan Island.

Key words: species diversity, functional diversity, phylogenetic diversity, tropical cloud forest, Hainan Island

王茜茜, 龙文兴, 杨小波, 熊梦辉, 康勇, 黄瑾, 王旭, 洪小江, 周照骊, 陆雍泉, 方精, 李时兴. 海南岛3个林区热带云雾林植物多样性变化. 植物生态学报, 2016, 40(5): 469-479. DOI: 10.17521/cjpe.2016.0021

Xi-Xi WANG, Wen-Xing LONG, Xiao-Bo YANG, Meng-Hui XIONG, Yong KANG, Jin HUANG, Xu WANG, Xiao-Jiang HONG, Zhao-Li ZHOU, Yong-Quan LU, Jing FANG, Shi-Xing LI. Patterns of plant diversity within and among three tropical cloud forest communities in Hainan Island. Chinese Journal of Plant Ecology, 2016, 40(5): 469-479. DOI: 10.17521/cjpe.2016.0021

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链接本文: https://www.plant-ecology.com/CN/10.17521/cjpe.2016.0021

https://www.plant-ecology.com/CN/Y2016/V40/I5/469

图/表 6

表1 样地概况

Table 1 Information of the study sites

研究样地 Study site	海拔 Elevation (m)	经度 Longitude (E)	纬度 Latitude (N)	坡度 Slope (°)	样方数 No. of plots	样方面积 Plot area (m²)	优势种 Dominant species
尖峰岭 Jianfengling	1 187.17-1 397.19	108.87°	18.72°	10-65	12	4 800	罗浮锥 Castanopsis fabri, 丛花厚壳桂 Cryptocarya densiflora, 美丽新木姜子 Neolitsea pulchella, 黄叶树 Xanthophyllum hainanense
霸王岭 Bawangling	1 313.24-1 385.24	109.21°	19.08°	2-45	21	8 400	蚊母树 Distylium racemosum, 赤楠 Syzygium buxifolium, 九节 Psychotria asiatica, 黄杞 Engelhardia rox- burghiana
黎母山 Limushan	1 363.73-1 403.32	109.76°	19.18°	3-42	15	6 000	野茶 Camellia sinensis var. assamica, 岭南青冈 Cyclob- alanopsis championii, 罗浮锥 Castanopsis fabri, 细枝柃 Eurya loquaiana

图1 样地分布图。

Fig. 1 Distribution of the study sites.

图2 尖峰岭(JFL)、霸王岭(BWL)和黎母山(LMS)热带云雾林α (A、B)及β (C、D)物种多样性比较。图中不同小写字母表示样地间有显著差异(p < 0.05)。粗实线表示中位数, 虚线表示整体平均值。

Fig. 2 Comparisons in α (panel A and B) and β (panel C and D) species diversity among Jianfengling (JFL), Bawangling (BWL) and Limushan (LMS). Different low-case letters indicate significant differences among plots (p < 0.05). Heavy horizontal lines indicate median values and dashed horizontal lines indicate mean values.

图3 尖峰岭(JFL)、霸王岭(BWL)和黎母山(LMS)热带云雾林间α (A、B、C)及β (D、E)功能多样性比较。图中不同小写字母表示样地间有显著差异(p < 0.05)。粗实线表示中位数, 虚线表示整体平均值。

Fig. 3 Comparisons in α (A, B, C) and β (D, E) functional diversity am- ong Jianfengling (JFL), Bawangling (BWL) and Limushan (LMS). Different low-case letters indicate significant differences among plots (p < 0.05). Heavy horizontal lines indicate median values and dashed horizontal lines indicate mean values.

图4 尖峰岭(JFL)、霸王岭(BWL)和黎母山(LMS)热带云雾林间α(A、B、C)及β(D、E)谱系多样性比较。图中不同小写字母表示样地间有显著差异(p < 0.05)。粗实线表示中位数,虚线表示整体平均值。

Fig. 4 Comparisons in α (A, B, C) and β (D, E) functional diversity among Jianfengling (JFL), Bawang- ling (BWL) and Limushan (LMS). Different low-case letters indicate significant differences among plots (p < 0.05). Heavy horizontal lines indicate median values and dashed horizontal lines indicate mean values.

表2 霸王岭、尖峰岭和黎母山热带云雾林植物功能性状的谱系信号

Table 2 Phylogenetic signal in functional traits in tropical cloud forests in Bawangling, Jianfengling and Limushan

性状 Trait	霸王岭 Bawangling		黎母山 Limushan		尖峰岭 Jianfengling
性状 Trait	K	p	K	p	K	p
植株高度 Plant height (H)	0.228	0.114	0.068	0.014	0.050	0.162
比叶面积 Specific leaf area (SLA)	0.294	0.059	0.098	0.006	0.037	0.282
叶绿素含量 Chlorophyll content (Chl)	0.223	0.042	0.225	0.001	0.053	0.073
叶厚度 Leaf thickness (LTh)	0.255	0.048	0.141	0.001	0.044	0.151
木材密度 Wood density (WD)	0.358	0.004	0.095	0.014	0.023	0.505

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