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四川大头茶若干生态问题的研究 预览 被引量:15

STUDIES ON SOME ECOLOGICAL QUESTIONS OF GORDONIA ACUMENATA
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摘要 四川大头茶是我国亚热带西南地区常绿阔叶林优质种之一,材质好,生长快而又未被人注意的一种优良树种。由于它是喜阳的常绿阔叶顶极先锋种其幼苗耐阴,所以在针阔叶混交林中排挤了先锋树种马尾松,而本身又在常绿阔叶林演替阶段,被更耐阴的顶极种所代替,这是由于顶极种有较高的生态位重叠和最大的生态位宽度值。四川大头茶Pn日变化具有双峰曲线型和单峰曲线型两种模式,而年变化有明显的季节现象。光照强度和温度是决定Pn的两 Gordonia acumenata is one of the species dominating tbe subtropical ever- green broad-leaved forests in the southwest China. It is a pioneer climax sp-ecies that has light-demanding adults and shade-tolerant seedlings.Its curves of diurnal variation of Pn in the sunny days of spring,sum- mer and autumn have two peaks,one in the morning and the other in theafternoon,while in the winter,only one peak occurs at about 14∶00 o’clock,Beijing time.Gordonia acumenata is characterized by high saturated net photosyntheticrate and low dark respiration,therefore,its adults are light-demanding,wh-1le its seedlings are shade-tolerant.The transplration rates of its seedlings are greatly influenced by air temperature,leaf temperature,light intensity,relative humidity and leaf water content.Its photosyntbetic rate can be signi-ficantly decreased by drought-stress,accompanied with this is an increased root/shoot ratio of the seedlings.This might be a strategy for Gordonia acu-menata to be adapted to drought-stress.The nutrient content in different organs of Gordonia acumcnata varies with season.
作者 钟章成 Zhong Zhang-cheng(Southwest China Normal University, Chongqing 630715)
出处 《植物生态学报》 CAS CSCD 北大核心 1995年第2期 103-114,共12页 Acta Phytoecologica Sinica
基金 国家自然科学基金
关键词 四川大头茶 阔叶树种 生态学 种群动态 Gordonia acumenata,Nutrient allocation,Photosynthesis,Population dynamics,Successional series
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