生物多样性 ›› 2023, Vol. 31 ›› Issue (11): 23252. DOI: 10.17520/biods.2023252
左艳洁1,2,#, 彭明春1, 王崇云1,*,#(), 沈泽昊3,1,*(), 李永萍1, 周新茂1, 周杰1, 周光信1,4, 任佳昕1, 刘忠安1
收稿日期:
2023-07-11
接受日期:
2023-11-18
出版日期:
2023-11-20
发布日期:
2023-12-22
通讯作者:
* E-mail: cywang@ynu.edu.cn;shzh@urban.pku.edu.cn
作者简介:
# 共同第一作者
基金资助:
Yanjie Zuo1,2,#, Mingchun Peng1, Chongyun Wang1,*,#(), Zehao Shen3,1,*(), Yongping Li1, Xinmao Zhou1, Jie Zhou1, Guangxin Zhou1,4, Jiaxin Ren1, Zhong’an Liu1
Received:
2023-07-11
Accepted:
2023-11-18
Online:
2023-11-20
Published:
2023-12-22
Contact:
* E-mail: cywang@ynu.edu.cn;shzh@urban.pku.edu.cn
About author:
# Co-first authors
摘要:
森林破碎化(或岛屿化)是导致当前生物多样性丧失的重要成因之一。滇中地区地带性的半湿润常绿阔叶林(semi-humid evergreen broad-leaved forests, SEBFs)具有显著的岛屿化特征。当前村寨周边面积大小、形状不一的“岛状”森林为研究破碎化的半湿润常绿阔叶林及其物种多样性特征提供了理想对象。本文通过植被遥感制图和群落样方调查, 运用空间统计、物种多样性分析、群落排序及环境解释, 探讨了滇中高原半湿润常绿阔叶林的岛屿化特征及其对群落物种多样性的影响。结果表明: (1)滇中高原现存半湿润常绿阔叶林仅占其潜在分布范围的1.5%, 面积 ≥ 100 ha的林斑有92块, 而面积 < 10 ha的林斑占斑块总数的54.6%和总面积的7.8%; 该植被类型面积萎缩和破碎化严重; (2) 99%的林斑到村寨的距离 < 3 km, 距离村寨越远, 林斑平均面积越大, 但样方物种α多样性除均匀度外变化不显著; 不同面积等级斑块中样方物种α多样性也仅物种丰富度有显著变化, 面积超过100 ha的大斑块有更高的物种丰富度; 离村寨越近, 样方群落物种组成简单化和同质化现象加强; (3)样方群落β多样性主要由物种替换引起。森林岛屿化是导致半湿润常绿阔叶林群落物种组成变化的主要因子, 而人类干扰强度对群落物种组成的影响高于局部生境异质性(水分条件)和区域气候梯度(低温限制)的影响。滇中高原半湿润常绿阔叶林以破碎小斑块大量存在于村寨周边, 在人为干扰下群落退化明显, 亟待引起足够重视, 并采取必要措施加强保护。
左艳洁, 彭明春, 王崇云, 沈泽昊, 李永萍, 周新茂, 周杰, 周光信, 任佳昕, 刘忠安 (2023) 滇中高原半湿润常绿阔叶林的岛屿化与物种多样性. 生物多样性, 31, 23252. DOI: 10.17520/biods.2023252.
Yanjie Zuo, Mingchun Peng, Chongyun Wang, Zehao Shen, Yongping Li, Xinmao Zhou, Jie Zhou, Guangxin Zhou, Jiaxin Ren, Zhong’an Liu (2023) Islandization and species diversity of semi-humid evergreen broad-leaved forests in the Central Yunnan Plateau. Biodiversity Science, 31, 23252. DOI: 10.17520/biods.2023252.
图1 滇中高原遥感影像解译所用半湿润常绿阔叶林群落调查样方和植物物种调查样点及资料数据分布
Fig. 1 Distribution of field investigation community plots and plant species distribution points, and those of literature data for remote sensing imageries’ interpretation of the semi-humid evergreen broad-leaved forests in the Central Yunnan Plateau
图2 滇中高原半湿润常绿阔叶林不同等级斑块总面积和斑块数量分布图
Fig. 2 Map of total area and area distribution of different patch area classes of semi-humid evergreen broad-leaved forests in Central Yunnan Plateau
图3 距村寨不同距离等级(缓冲区等级)和不同面积等级的半湿润常绿阔叶林不同斑块大小的数量分布
Fig. 3 Distribution of number of semi-humid evergreen broad-leaved forest patches of different area classes in different distance classes from villages (buffer class)
多样性指标 Diversity index | 距离等级 Distance class | 面积等级 Area class | ||
---|---|---|---|---|
K-W | P | K-W | P | |
物种丰富度 Species richness | 4.268 | 0.511 | 17.294 | 0.008** |
Shannon-Wiener多样性指数 Shannon-Wiener diversity index | 6.610 | 0.251 | 7.522 | 0.275 |
Simpson优势度指数 Simpson dominance index | 10.228 | 0.069 | 7.21 | 0.302 |
Pielou均匀度指数 Pielou evenness index | 14.728 | 0.012* | 10.887 | 0.092 |
表1 滇中高原半湿润常绿阔叶林样方物种α多样性指数的组间Kruskal-Wallis检验(K-W)
Table 1 Intergroup Kruskal-Wallis test (K-W) for α diversity index of species in the plots of semi-humid evergreen broad-leaved forests
多样性指标 Diversity index | 距离等级 Distance class | 面积等级 Area class | ||
---|---|---|---|---|
K-W | P | K-W | P | |
物种丰富度 Species richness | 4.268 | 0.511 | 17.294 | 0.008** |
Shannon-Wiener多样性指数 Shannon-Wiener diversity index | 6.610 | 0.251 | 7.522 | 0.275 |
Simpson优势度指数 Simpson dominance index | 10.228 | 0.069 | 7.21 | 0.302 |
Pielou均匀度指数 Pielou evenness index | 14.728 | 0.012* | 10.887 | 0.092 |
图4 滇中高原距村寨不同距离等级(a-d)和不同森林斑块面积等级(e-h)的样方群落物种α多样性差异(平均值 ± 标准差)。不同字母表示差异显著(P < 0.05)。
Fig. 4 Difference of α diversity indices between different distance classes from villages (a-d) and between different patch area classes (e-h) in a semi-humid evergreen broad-leaved forest in the Central Yunnan Plateau (mean ± SD). Different letters indicate significant differences (P < 0.05).
图5 滇中高原半湿润常绿阔叶林样地物种组成的非度量多维尺度分析(NMDS)排序图。图中实心圆表示野外调查数据; 三角形表示《云南植被》数据; 不同颜色代表不同的群落类型, 实心圆和三角的大小表示样地所在斑块面积的大小。A: 高山栲群落; B: 元江栲群落; C: 高山栲 + 元江栲群落或元江栲 + 白穗石栎群落; D: 元江栲+滇石栎群落; E: 滇青冈群落; F: 高山栲 + 滇油杉-云南含笑群落; G: 高山栲 + 滇油杉群落。
Fig. 5 Non-metric multidimensional scaling (NMDS) ordination diagram of the plots of semi-humid evergreen broad-leaved forests in the Central Yunnan Plateau. The color of the circles (data from field sampling) and triangles (data from Vegetation of Yunnan) in the figure represents different community types, and the size of the icon represents the size class of the patch area where the plot is located. A, Ass. Castanopsis delavayi; B, Ass. C. orthacantha; C, Ass. C. delavayi + C. orthacantha or Ass. C. orthacantha + Lithocarpus craibianus; D, Ass. C. orthacantha + L. dealbatus; E, Ass. Cyclobalanopsis glaucoides; F, Ass. C. delavayi + Keteleeria evelyniana-Michelia yunnanensis; G, Ass. C. delavayi + K. evelyniana.
解释变量 Interpretative variables | NMDS 1 | NMDS 2 |
---|---|---|
斑块面积 Patch area | 25.0% | 1.8% |
斑块形状指数 Patch shape Index | 16. 5% | - |
人口密度 Population density | 16. 1% | 10.9% |
国内生产总值 Gross domestic product (GDP) | 12.9% | 7.5% |
地形湿度指数 Topographic wetness index | 10.9% | - |
居民点密度 Village density | 6.2% | 10.1% |
年均温 Annual mean temperature | 5.1% | 20.0% |
土壤容重 Soil bulk density | 3.9% | - |
斑块重心-最近居民点距离 Gravity center-nearest village distance | 3.4% | 7.0% |
地形起伏度 Relief | - | 1.3% |
最冷季平均温 Mean temperature of coldest quarter | - | 18.1% |
道路密度 Road density | - | 23.3% |
表2 基于逐步回归分析和方差分解对非度量多维尺度分析(NMDS)排序轴的环境解释
Table 2 Environmental interpretation on the non-metric multidimensional scaling (NMDS) ordering axis based on stepwise linear regression and variation partitioning
解释变量 Interpretative variables | NMDS 1 | NMDS 2 |
---|---|---|
斑块面积 Patch area | 25.0% | 1.8% |
斑块形状指数 Patch shape Index | 16. 5% | - |
人口密度 Population density | 16. 1% | 10.9% |
国内生产总值 Gross domestic product (GDP) | 12.9% | 7.5% |
地形湿度指数 Topographic wetness index | 10.9% | - |
居民点密度 Village density | 6.2% | 10.1% |
年均温 Annual mean temperature | 5.1% | 20.0% |
土壤容重 Soil bulk density | 3.9% | - |
斑块重心-最近居民点距离 Gravity center-nearest village distance | 3.4% | 7.0% |
地形起伏度 Relief | - | 1.3% |
最冷季平均温 Mean temperature of coldest quarter | - | 18.1% |
道路密度 Road density | - | 23.3% |
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