摘要
用样带取样法,来研究不同取样尺度和不同取样尺度条件下的多个环境因子与鼎湖山植物群落α多样性的关系。取样尺度分别为10、20、40、80m和160m。涵盖鼎湖山主要的植被类型:季风常绿阔叶林、针阔混交林、沟谷常绿阔叶林和针叶林。相关分析和主成分分析结果表明,环境因子对各层次的α多样性的影响程度各不相同,达到显著相关性的取样尺度也不一样,表现出较大的复杂性,同时也表明样带上的环境异质性较高。因此,用海拔梯度作为主要的环境梯度来研究鼎湖山植物群落多样性具有合理性。海拔高度与乔木层多样性的关系在所有取样尺度上都较密切,这说明海拔高度可能是影响乔木层α多样性的最重要环境因子。
Dinghushan national nature reserves is located in Zhaoqing, Guangdong Province, southern China（112°30′39″～112°33′41″E,23°09′21″～23°11′30″N）. Its total area is 1155hm^2, with the altitude of 14.1 - 1000.3m. It is covered by tropical-subtropical forest, and in the South subtropical wetness monsoon climate areas. The relationship between α diversity of plant community with different sampling scales and environmental factors were studied in this paper.The permanent transect of plant communities was established in Dinghushan, from the upside of Dekeng to Sanbao apex, with the scale of 10m × 1160m, that was subdivided into 120 contiguous 10m × 10m quadrats. It was 50.2m to 476.5m, with the absolute altitude 426m. Within each quadrat, altitude and other environmental factors were investigated, then every woody plant DBH ≥1 cm were identified into species, and tagged. The sampling scales were 10m, 20m, 40m, 80m and 160m, including the main vegetation types of Dinghushan： （1） monsoon evergreen broad-leaved considered as a zonal vegetation with a history of more than 400 years, （2）mixed coniferous broad-leaf forest, （3） evergreen broad-leaved in the valley, （4） Pinus massoniana forest. The analysis of correlation and principal component results were showed that different environmental factors had a different effect on α diversity in four plant crown layers： Tree, Shrub, Herb and Liana. The difference of α diversity was significant at different sampling scales.Simultaneity, it showed high environmental heterogeneity on transect. Therefore, it is reasonable to choose altitude grads as the main environmental grads to study the biodiversity of Dinghushan plant community. Altitude had closely correlation with α diversity on tree layer at all the sampling scales, showing that altitude was the most important environmental factor for α diversity on tree layer.
出处
《生态学报》
CAS
CSCD
北大核心
2006年第7期2301-2307,共7页
Acta Ecologica Sinica
基金
国家自然科学基金资助项目(30470306)~~
关键词
鼎湖山
样带
取样尺度
Α多样性
环境因子
Dinghushan
transect
sampling scale
a diversity
environmental factors
