DIFFERENT BIOMECHANICAL DESIGN AND ECOPHYSIOLOGICAL STRATEGIES IN JUVENILES OF TWO LIANA SPECIES WITH CONTRASTING GROWTH HABIT
DIFFERENT BIOMECHANICAL DESIGN AND ECOPHYSIOLOGICAL STRATEGIES IN JUVENILES OF TWO LIANA SPECIES WITH CONTRASTING GROWTH HABIT
复制标题
两种具有对比生长习性的藤本植物幼体的不同生物力学设计和生态生理策略
DOI：
10.3732/ajb.1300429
复制
发表时间：
2014-06-01
影响因子：
3
通讯作者：
Cao, Kun-Fang
中科院分区：
文献类型：
--
作者：
Chen, Ya-Jun;Bongers, Frans;Cao, Kun-Fang
研究结论：藤本植物是热带地区的主要功能类型。虽然一些藤本植物在发芽后立即开始攀爬（避阴），但其他藤本植物有很长的自立阶段（耐阴）。这两个生长习性的形态生理特征是unknown.Methods：我们量化的生长性状，生物量分配，力学，解剖学和水力学的Ventilago calyculata（立即专性攀援植物）和枣attopensis（具有很长的自我支持阶段），无论是在家庭鼠李科的树苗。结果表明：在幼龄阶段，长萼沙蚕的体长比、高生长速率和光合速率均高于长萼沙蚕，但生物量的生长速率与长萼沙蚕相近; attopensis。与此相反，Z. attopensis具有较高的叶面积增长率，比叶面积和叶质量分数。枣茎较硬，但传导性较弱。幼树的茎硬度从基部到顶端逐渐减小。而在萼叶薯蓣中则有所增加。两种植物对木质部栓塞的抗性相似。然而，V. calyculata的叶子能够抵抗更大的水分亏缺。成熟期，木质部导管较宽、较长，提高了茎比电导率，增强了茎叶的抗旱性。叶片比电导率显著高于叶片，耐旱性强于叶片。attopensis.Conclusions:两种藤本植物在生长、生物量分配、解剖、力学、生理生态和水力特性等方面存在显著差异，这与它们的生长习性和遮荫适应策略有关。
Premise of the study: Lianas constitute a major functional type in tropical zones. While some liana species start climbing immediately after germination (shade-avoidance), others have a long self-supporting phase (shade-tolerance). The morphophysiological characteristics of these two growth habits are unknown.Methods: We quantified growth traits, biomass allocation, mechanics, anatomy, and hydraulics for saplings of Ventilago calyculata (an immediate obligate climber) and Ziziphus attopensis (having a long self-supporting phase), both in the family Rhamnaceae. The mechanics, anatomy, and hydraulics for the mature individuals of the two species were also evaluated.Key results: In the juvenile stage, V. calyculata had a higher slenderness ratio, height growth rate, and photosynthetic rate but similar biomass growth rate compared with Z. attopensis. In contrast, Z. attopensis had a higher leaf area growth rate, specific leaf area, and leaf mass fraction. Ziziphus attopensis had stiffer, but less conductive stems than V. calyculata. Stem rigidity of saplings decreased from base to apex in Z. attopensis, but increased in V. calyculata. Both species had similar resistance to xylem embolism. However, the leaves of V. calyculata were able to resist greater water deficits. At the mature stage, wider and longer vessels emerged in the xylem, and both species increased stem specific conductivity and drought resistance in stems and leaves. Ventilago calyculata had significantly higher specific conductivity and was more drought tolerant than Z. attopensis.Conclusions: The two lianas differed significantly in growth, biomass allocation, anatomy, mechanics, ecophysiology, and hydraulic properties in line with their growth habits and shade adaptation strategies.