2019年10月17日 星期四
浙江南麂列岛大檑山屿水仙自然居群的物种多样性、环境解释及空间分布格局分析
Analyses on species diversity, environmental interpretation and spatial distribution pattern of natural population of Narcissus tazetta var. chinensis on Daleishan Island of Nanji Islands in Zhejiang Province
2017年 第26卷 第3期 页码[100-108]    下载全文[1MB]  
摘要

在野外调查基础上,对浙江南麂列岛大檑山屿水仙(Narcissus tazetta var. chinensis M. Roem.)自然居群5个典型生境(乔木林地、林缘、弃耕地、荒坡和灌木林地)的物种组成和α多样性指数进行分析,并采用典范对应分析(CCA)、最小生成树(MST)分析和空间点格局分析(SPPA)分别研究水仙自然居群物种分布与主要环境因子的关系、水仙与其伴生种的种间关系及空间分布格局。结果表明:浙江南麂列岛大檑山屿水仙自然居群5个生境共有植物28种,其中,乔木林地、林缘、弃耕地、荒坡和灌木林地分别有16、13、9、8和8种。5个生境中水仙的重要值均最高。弃耕地和乔木林地的Shannon-Wiener多样性指数较高,灌木林地和林缘其次,荒坡最低。5个生境的聚类分析结果显示:弃耕地和乔木林地聚为一组,其他3个生境聚为另一组。CCA排序结果显示:水仙的分布与坡度呈负相关,与土壤的电导率、含水量和温度以及坡向和海拔呈正相关,说明水仙适宜生长于坡度平缓以及土壤的含水量、电导率和温度适中的生境。MST分析结果显示:水仙与其伴生种羊蹄(Rumex japonicus Houtt.)、鬼针草(Bidens pilosa Linn.)、野艾蒿(Artemisia lavandulifolia DC.)的种间关系最近,这3个伴生种应作为水仙自然居群恢复生物治理的重点防控对象。SPPA分析结果显示:荒坡中水仙群丛分布数量相对较多,集中分布于东北角,西部和南部较少;在0.0~0.1 m尺度时,水仙群丛表现为随机分布;在大于0.1 m尺度时,表现为集中分布。研究结果显示:浙江南麂列岛大檑山屿水仙自然居群主要集中分布在东南坡的弃耕地,海岛生境异质性与自身繁殖特性是影响南麂列岛水仙自然居群恢复的关键因素,建议对水仙群落动态进行长期监测和相关研究,并结合岛屿生态系统进行综合管理。

Abstract

Based on field survey, species composition and α diversity indexes of five typical habitats (arbor land, forest edge, abandoned land, waste hillside and shrub land) of natural population of Narcissus tazetta var. chinensis M. Roem. on Daleishan Island of Nanji Islands in Zhejiang Province were analyzed, and the relationship between species distribution and main environmental factors, interspecific relationship between N. tazetta var. chinensis and its associated species, and spatial distribution pattern of natural population of N. tazetta var. chinensis were studied by using canonical correspondence analysis (CCA), minimum spanning tree (MST) analysis and spatial point pattern analysis (SPPA), respectively. The results show that there are 28 species in five habitats of natural population of N. tazetta var. chinensis on Daleishan Island of Nanji Islands in Zhejiang Province, in which, there are 16, 13, 9, 8 and 8 species in arbor land, forest edge, abandoned land, waste hillside and shrub land, respectively. Important value of N. tazetta var. chinensis in all five habitats is the highest. Shannon-Wiener diversity index of abandoned land and arbor land is higher, that of shrub land and forest edge is the second, while that of waste hillside is the lowest. Cluster analysis result of five habitats shows that abandoned land and arbor land are clustered into one group, and other three habitats are clustered into the other group. CCA ordination result shows that distribution of N. tazetta var. chinensis is negatively correlated with slope, and positively correlated with electrical conductivity, water content and temperature of soil, aspect, and altitude, indicating that habitat with gentle slope, and moderate water content, electrical conductivity and temperature of soil is suitable for the growth of N. tazetta var. chinensis. MST analysis result shows that N. tazetta var. chinensis has the closest interspecific relationship with its associated species Rumex japonicus Houtt., Bidens pilosa Linn. and Artemisia lavandulifolia DC., which should be considered as key prevention objects in biological treatment for restoration of natural population of N. tazetta var. chinensis. SPPA analysis result shows that number of N. tazetta var. chinensis association distributed in the waste hillside is relatively high, which distributes concentratedly in the northeast corner, but rarely in the west and south; N. tazetta var. chinensis association shows random distribution at the scale of 0.0-0.1 m; when the scale is greater than 0.1 m, it shows concentrated distribution. It is suggested that natural population of N. tazetta var. chinensis on Daleishan Island of Nanji Islands in Zhejiang Province mainly distributes concentratedly in abandoned land on the southeast slope, and heterogeneity of island habitat and self-reproduction characteristics are the key factors influencing restoration of natural population of N. tazetta var. chinensis on Nanji Islands. Long-term monitoring and related research are recommended for the community dynamics of N. tazetta var. chinensis, and integrated management combined with the ecosystem of the island is also suggested.

关键词南麂列岛; 水仙; α多样性指数; 生境; 典范对应分析(CCA); 环境因子; 空间分布格局
Key wordsNanji Islands; Narcissus tazetta var. chinensis M. Roem.; α diversity index; habitat; canonical correspondence analysis (CCA); environmental factor; spatial distribution pattern
作者朱弘1a,1b, 蔡厚才2, 尤禄祥1a,1b, 伊贤贵1a,1b, 杨国栋1a,1b, 段一凡1a,1b, 陈万东2, 王贤荣1a,1b
所在单位1. 南京林业大学: a. 生物与环境学院, b. 南方现代林业协同创新中心, 江苏 南京 210037; 2. 南麂列岛国家级海洋自然保护区管理局, 浙江 温州 325400
点击量508
基金项目南麂列岛国家级海洋自然保护区研究项目(NJKJ-2016-006)