巴山榧树地理分布格局及潜在分布区  

Geographic Distribution and Potential Distribution of Torreya fargesii

作　　者：周先容[1,2] 余岩[1] 周颂东[1] 何兴金[1] 

机构地区：[1]四川大学生命科学学院,成都610064 [2]长江师范学院生命科学与技术学院,涪陵408100

出　　处：《林业科学》2012年第2期1-8,共8页Scientia Silvae Sinicae

基　　金：国家自然科学基金资助项目(31070166);教育部博士点基金(20090181110064);重庆市教委科技项目(KJ091314)

摘　　要：基于文献资料、标本资料和实地考察,收集巴山榧树县级分布点57个,在此基础上,使用生态位模型(GARP)预测巴山榧树在中国的潜在分布区,分析其地理分布及濒危原因。结果表明:汇流累积量、年均气温、雨日频率和水汽压对巴山榧树分布的影响较小,而太阳辐射、极端低温、极端高温和霜日频率对其分布影响显著;巴山榧树间断分布于海拔800～2700m的亚热带山区,散生于针阔叶混交林、灌丛及沟谷地带;预测我国中部地区为巴山榧树良好生长区;目前巴山榧树的实际分布远小于其适生区;巴山榧树虽然仍有不少种群,但各种群分布区域狭窄、种群密度小、人类破坏极为严重,应加强保护和繁育。Based on data of Torreya fargesii distribution collected from literature and specimen records, as well as a field survey which covered 57 county-scale plots, the Genetic Algorithm for Ruleset Production （GARP） modeling approach was applied to predict its potential distribution range in China and analyze its distribution pattern and endangered causes. Our results indicated that： environmental factors, such as solar radiation, minimum temperature, maximum temperature and frost days, greatly influenced size of the potential range, while flow accumulation, mean annual temperature, wet days and water vapour pressure had little impact on the distribution. T. fargesii distributed disjunctively in subtropical mountains from 800 to 2 700 m and scattered in coniferous and broad-leaved forests, hillside thickets and ravine region. Potential distribution estimation indicated that the mountains in Central China would be the optimum habitats for T. fargesii to grow. Potential areas that we predicted suitable for growth of T. fargesii were much larger than its actual areas, suggesting that T. fargesii had been experiencing its extinct process. Most of the T. fargesii populations had a narrow distribution with very small population density, therefore, the habitat conservation would be crucial for T. fargesii protection.

关 键 词：巴山榧树 GARP 潜在分布区预测 地理分布 保护 

分 类 号：S791.53[农业科学—林木遗传育种] Q948.5[农业科学—林学]