摘要
为了探讨毛竹Phyllostachys edulis在快速生长期从笋长成幼竹这一动态过程与成竹之间是否存在水分供给关系以及水势是否是驱动新竹快速生长的关键因子,以浙江农林大学毛竹生理生态定位监测站为依托,利用PSYPRO多露点水势系统配套的L-51A叶水势探头和PCT-55土壤水势探头,在毛竹快速生长期测定毛竹样株叶水势及土壤水势。结果表明：①在快速生长期内,不同竹龄毛竹（新竹至6年生）的叶水势变化规律均为：随年龄增大,水势值也越大,且竹龄对水势的影响均达到显著水平（P〈0.05）;在生长中期同一竹龄毛竹叶水势值均低于生长前期和生长后期,且在生长中期成竹之间的叶水势差异均不显著（P〉0.05）。说明在毛竹快速生长期内母竹向新竹输送水分,且这种传输作用在生长中期更加强烈。②在快速生长期水分横向传输均为成竹传送给新竹,纵向传输均为土壤—下层叶—中层叶—上层叶—大气,正午土壤与叶水势梯度、不同竹龄之间叶水势差增大,土壤—大气水势差1~3个数量级。强大的水势差的存在表明：母竹将水分传输给新竹主要依靠水势梯度的作用。3在快速生长期内土壤—叶、叶—大气、土壤—大气之间的相关性均达到极显著水平（P〈0.01）,表明在快速生长期土壤水势、叶水势、大气水势相互影响,形成统一连续体。水势是驱动毛竹快速生长的关键因素。
To determine whether 1 ） water transport trom mature w yuu,,~ ~ ,~y j water potential were key factors driving growth of young Ph. edulis in its fast-growth period, a PSYPRO water potential system with L-51A leaf water potential probes and PCT-55 soil potential probes were used to measure leaf and soil water potential at the physiological-ecological monitoring station of Zhejiang A ＆ F University. Analysis included analysis of variance （ANOVA）, Turkey＇s test for multiple comparisons and a correlation analysis. Results for the period of rapid growth with new to six-year-old Ph. edulis bamboo showed that the wa- ter potential value significantly increased （P 〈 0.05） with an increase in age. Leaf water potential of same-aged bamboo was lower in the rapid leaf water potential differences in the period correlation of water potential to growth period than before and after. However, among mature Ph. edulis, rapid growth period were not significant. Also, during the rapid growth soil-leaf （P = 0.627）, soil-atmosphere （P = 0.908）, and leaf-atmosphere （P =0.716） were all highly significant that a key factor with mature Ph. edulis （P 〈 0.01 ）. Thus, existence of a strong water potential gradient meant water transport to young Ph. edulis mainly relied on the water potential gradient for driving fast-growth. [Ch, 5 tab. 21 ref.]
出处
《浙江农林大学学报》
CAS
CSCD
北大核心
2015年第5期722-728,共7页
Journal of Zhejiang A&F University
基金
国家自然科学基金资助项目(31270497
30972397)
省院合作项目(2014SY16)
浙江农林大学研究生科研创新基金资助项目(3122013240229)
关键词
植物生理学
毛竹
叶水势
土壤水势
水势梯度
日变化
plant physiology
Phyllostachys edulis
leaf water potential
soil water potential
water potential gradient
diurnal variation
