生物多样性 ›› 2023, Vol. 31 ›› Issue (11): 23252.  DOI: 10.17520/biods.2023252

• 半湿润常绿阔叶林专题 • 上一篇    下一篇

滇中高原半湿润常绿阔叶林的岛屿化与物种多样性

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   

  1. 1.云南大学生态与环境学院, 昆明 650091
    2.大理州洱海湖泊研究院, 云南大理 671099
    3.北京大学城市与环境学院, 地表过程分析与模拟教育部重点实验室, 北京 100871
    4.云南省生态环境工程评估中心, 昆明 650228
  • 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:
    云南省基础研究计划重大项目课题(202101BC07 0002);云南省科技厅-云南大学双一流学科建设重大专项(2018FY001-002)

Islandization and species diversity of semi-humid evergreen broad-leaved forests in the Central Yunnan Plateau

Yanjie Zuo1,2,#, Mingchun Peng1, Chongyun Wang1,*,#(), Zehao Shen3,1,*(), Yongping Li1, Xinmao Zhou1, Jie Zhou1, Guangxin Zhou1,4, Jiaxin Ren1, Zhong’an Liu1   

  1. 1 School of Ecology and Environmental Science, Yunnan University, Kunming 650091
    2 Dali Erhai Lake Research Institute, Dali, Yunnan 671099
    3 Key Laboratory of MOE for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871
    4 Yunnan Appraisal Center for Ecological and Environmental Engineering, Kunming 650228
  • 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。

关键词: 半湿润常绿阔叶林, 森林斑块, 岛屿化, 物种多样性, 人类影响

Abstract

Aims: This study focuses on the semi-humid evergreen broad-leaved forests (SEBFs) in Central Yunnan Plateau, a zonal vegetation characterized by varying patches sizes and shapes distributed around rural villages. Through remote sensing based vegetation mapping and field vegetation investigation, we aimed to explore the spatial patterns of fragmented SEBF patches, the changes in plant species diversity of SEBFs in relation with its patch size and distance class from villages, and assess the effects of environmental and anthropogenic factors on the species composition of SEBFs communities.

Methods: This study investigated the fragmentation features of SEBFs and their impact on species diversity. We conducted spatial analysis and species diversity assessments using the patch and community data from SEBFs. SEBFs’ patches were derived from Landsat 8 OLI imageries in combination of supervised classification and visual interpretation. α diversity and β diversity were compared among the plot community types. And the species composition was compared using non-metric multidimensional scaling to indicate the importance of environmental drives.

Results (1) In Central Yunnan Plateau, the existing SEBFs only accounted for 1.5% of their potential, climate-determined distribution range. This area comprised 92 forest patches covering a space greater than 100 ha, whereas forest patches covering an area of < 10 ha accounted for 54.6% of the total patch number but only 7.8% of the total area. This highlighted the significant shrinking and fragmenting of this vegetation type’s area. (2) Remarkably, 99% of forest patches were within 3 km from rural villages. A trend emerged where patches farther away from villages had larger area, but the species α diversity did not show significant changes except for species evenness. For sample plots in patches with different area classes, α diversity only showed significant changes in species richness; larger patches exceeding 100 ha exhibited higher species richness. In contrast, the closer a patch was to a village, the more simplified and more homogeneous its species composition tended to be. (3) β diversity among plot communities was primarily driven by species replacement. Forest islanding was a key factor influencing changes in species composition of SEBFs communities. Moreover, the impact of human interference on species composition was significantly greater than that of local habitat heterogeneity (water conditions) and regional climate gradients (low temperature limitations).

Conclusion: The SEBFs in the Central Yunnan Plateau are abundant near villages with fragmented small patches, and these areas are experiencing notable degradation due to human interference. This situation is urgent and demands attention and the implementation of necessary protective measures.

Key words: semi-humid evergreen broad-leaved forests, forest patch, islandization, species diversity, anthropogenic impacts