摘要
采用英国生产的LCPRO+全自动便携式植物光合测定仪,以10个种源红锥幼林叶片为研究对象,进行光合特性测定和比较分析。结果表明:不同红锥种源净光合速率、蒸腾速率和气孔导度日变化均呈"双峰"曲线,在上午10:00(主峰值)和下午17:30(次峰值)表现出2个峰值;其净光合速率在2个峰值时间段中间有明显的"午休"现象,其产生原因是自身的气孔限制因子;红锥种源的胞间CO2浓度为不规则"W"型,以清早为最高,不同种源的最小值出现的时间有所不同;10个种源的生长性状指标与净光合速率呈显著正相关性(其中树高、材积与净光合速率呈极显著性正相关,胸径与净光合速率呈显著性正相关)。在以木材收获量为主要目标的人工林经营中,应选择材积量和净光合速率最大的博白和浦北红锥种源。
With LCPRO＋ Automatic Portable Plant Photosynthesis Meter made in British,by taking 10 different provenances of Castanopsis hystrix young leaves as the studying objects,the photosynthetic characteristics and comparative analysis have been investigated.The results show that the net photosynthetic rate,transpiration rate and diurnal variations of stomatal conductance of different C.hystrix provenances appeared a bimodal curve,being at 10：00 in the morning and 17：30 in the afternoon;there was an obvious ＂noon break＂ phenomenon between the 2 peak time’s interspace,the reason is their own stomatal limitation factors;the intercellular CO2 concentration of C.hystrix provenances appeared inregular W-type,the highest concentration of CO2 appeared in the morning,and the minimum values of different provenances appeared in different time quantum;the growth traits and rate of net photosynthesis of 10 different provenances were positive correlation each other,the tree height and wood volume showed an extremely significant positive correlation to net photosynthesis rate,the diameter at breast height and net photosynthetic rate showed a significant positive correlation.It is suggested that Bobai and Pubei C.hystrix provenances that have maximum amount of volume and net photosynthetic rate should be chosen for the plantation management which takes timber yield as the main target.
出处
《中南林业科技大学学报》
CAS
CSCD
北大核心
2013年第6期43-47,共5页
Journal of Central South University of Forestry & Technology
基金
广西科学研究与技术开发计划课题"红锥良种选育与丰产栽培模式研究"(桂科攻10100012-3)
关键词
红锥
净光合速率
蒸腾速率
气孔导度
胞间CO2浓度
种源
Castanopsis hystrix A.DC.
transpiration rate
stomatal conductance
intercellular CO2concentration
provenance
