摘要
采用多元回归树(MRT)对秦岭山地天然次生林群落进行数量分类,采用典范对应分析(CCA)进行排序,分析了秦岭山地天然次生林群落物种多样性沿海拔梯度的变化规律。结果表明:(1) 275个样方共有种子植物195种,隶属61科128属。乔、灌、草3个层次物种多样性变化沿海拔梯度的变化趋势基本一致,呈单峰模型;(2)经交叉验证认为秦岭山地天然次生林群落可分为2类,Ⅰ冬瓜杨(Populus purdomii)+陇东海棠(Malus kansuensis)+蛇莓(Duchesnea indica)群落,Ⅱ锐齿槲栎(Quercus aliena var. acuteserrata)+黄栌(Cotinus coggygria)+茜草(Rubia cordifolia)群落;(3) CCA排序结果揭示了群落生境的分布范围,反映出生态轴的排序意义,较好地反映秦岭山地天然次生林群落与环境因子的关系,其结果表明,海拔、坡向、凋落层厚度和干扰情况4个变量对该地区次生林群落的分布有较大的影响。
The quantitative analysis of species diversity,forest community classification,and ordination are the basis for secondary forest vegetation protection and restoration,and therefore,has fundamental theoretical significance. Forest community classification,ordination,and species diversity along elevation gradients can reveal the relationships between species distribution and environmental factors,and can provide an important basis for understanding the function of mountain ecosystems. Zhouzhi Nature Reserve is located in the middle of the North slope of the Qinling mountains. It is rich in species diversity,and the vegetation is representative and typical of the area. In this study,we collected data from five sites along the elevation gradient,and aimed to determine the relationships of different forest communities and the environment,and the variation of species diversity along the elevation gradient. The diversity was analyzed using the richness,Shannon-Wiener,and Pielou indexes to represent the diversity of forest vegetation communities at all levels;the forest community was classified using multiple regression trees( MRT),and ordination using canonical correspondence analysis( CCA). Results were as follows:( 1) There were 195 plant species belonging to 61 families and 128 genera in 25plots;Gramineae and Compositae were the dominant families. The species diversity variation along the elevation gradient was similar,showing a significant unimodal distribution pattern,and as the elevation increased,it reached a maximum value of 1600-1800 m,then decreased. The forest community structure and vertical pattern of species diversity varied withthe elevation gradient,revealing a significant biodiversity environment gradient variation relationship;( 2) Through the MRT analysis,we found the forest community was divided into two categories by cross validation: 1. Populus purdomii +Malus kansuensis + Duchesnea indica,2. Quercus aliena var. acuteserrata + Cotinus coggygria + Rubia cordifolia;( 3) The results of CCA clearly ref
作者
钟娇娇
陈杰
陈倩
姬柳婷
康冰
ZHONG Jiaojiao;CHEN Jie;CHEN Qian;JI Liuting;KANG Bing(College of Life Science,Northwest Agriculture and Forestry University,Yangling 712100,China)
出处
《生态学报》
CAS
CSCD
北大核心
2019年第1期277-285,共9页
Acta Ecologica Sinica
基金
2017年中医药公共卫生服务补助专项"全国中药资源普查项目"(财社[2017]66号)
关键词
物种多样性
多元回归树
典范对应分析
秦岭山地
天然次生林
species diversity
multiple regression trees( MRT)
canonical correspondence analysis( CCA)
Qinling Mountains
natural secondary forest
