散孔材与环孔材树种枝干、叶水力学特性的比较研究

为揭示散孔材与环孔材树种树木水分生理特性的差异,选取了常见的3种散孔材落叶树种(毛白杨、法国梧桐和樱花)和3种环孔材落叶树种(刺槐、合欢和白蜡),研究了其枝干与叶水力学性质的差异及其协调性。结果表明:3种环孔材树种枝干横截面积基础上的最大比导水率(Ks-max)大于3种散孔材树种,但其木质部对空穴化的脆弱性(P50branch)高于散孔材树种,6种树木枝干的水分传输能力和抵抗空穴化能力之间存在一种相互制约的权衡关系。3种散孔材与3种环孔材树种的叶最大水力导度(Kl-max)和水力脆弱性(P50leaf)并无显著差异;对于3种散孔材树种,叶的水力脆弱性要高于枝干,但对3种环孔材树种而言,枝干的水力脆弱性要高于叶。6种树木枝干和叶的水力学性质(Kmax、P50)之间并无相关关系。这些结果表明:散孔材与环孔材树种的枝干水力学特性有明显差异,但叶水力学特性无差异;枝干与叶水力学性质之间是相互独立的。     

Reactivation of Vessel Production in Ash (Fraxinus excelsior L.) Trees

Stages of earlywood vessel development have been compared withstages of bud and shoot growth throughout 12-year-old treesof ash (Fraxinus excelsior L.). Reactivation of vessel productionwas not simultaneous throughout the tree. There was evidencethat vessel expansion progressed basipetally down branches andacropetally up the main stem. The earliest expanding vesselswere found scattered around the circumference of main stem andbranches about 3 weeks before the emergence of foliage leavesfrom the buds. Other vessels expanded later between the earlierones so the whole of the first earlywood layer was expandingby 1.5 weeks before leaf emergence; this is suggested as a convenientstage to use as a baseline for a model of wood production inash. Vessel maturation progressed basipetally down the mainstem as well as branches, the first mature (presumably functional)vessels appearing in the upper stem shortly before leaf emergence.Mature vessels were not found in the lower part of the mainstem until after the beginning of rapid leaf expansion afterbudbreak, contrary to a previous assumption that functionalearlywood vessels are of necessity produced before leaf expansionin ring-porous trees. Patterns of vessel expansion are comparedbetween the ring-porous ash and the diffuse-porous sycamore;these data suggest that expansion of earlywood vessels beganat the same time in relation to budbreak in the two species,but the location of the first vessel expansion differed. ash, cambial reactivation, Fraxinus excelsior L., ring-porous hardwood, vessel expansion, vessel maturation     

Water loss regulation to soil drought associated with xylem vulnerability to cavitation in temperate ring-porous and diffuse-porous tree seedlings

Key message

Sustainable stomatal opening despite xylem cavitation occurs in ring-porous species and stomatal closure prior to cavitation in diffuse-porous species during soil drought.

Abstract

To elucidate the relationship between water loss regulation and vulnerability to cavitation associated with xylem structure, stomatal conductance (g _s), defoliation, vulnerability curves, and vessel features were measured on seedlings of ring-porous Zelkova serrata and Melia azedarach, and diffuse-porous Betula platyphylla var. japonica, Cerasus jamasakura and Carpinus tschonoskii. Under prolonged drought conditions, the percentage loss of hydraulic conductivity (PLC) increased and g _s decreased gradually with decreasing predawn (Ψ_pd) or xylem water potential (Ψ_xylem) in Z. serrata. During the gentle increase of PLC in M. azedarach, g _s increased in the early stages of dehydration while leaves were partly shed. A sharp reduction in g _s was observed before the onset of an increase in the PLC for drying plants of the three diffuse-porous species, suggesting cavitation avoidance by stomatal regulation. In the ring-porous species, xylem-specific hydraulic conductivity (K _s) was higher, whereas the vessel multiple fractions, the ratio of the number of grouped vessels to total vessels, was lower than that in the diffuse-porous species, suggesting that many were distributed as solitary vessels. This may explain the gradual increase in the PLC with decreasing Ψ_xylem because isolated vessels provide less opportunity for air seeding. Different water loss regulation to soil drought was identified among the species, with potential mechanisms being sustainable gas exchange at the expense of xylem dysfunction or partial leaf shedding, and the avoidance of xylem cavitation by strict stomatal regulation. These were linked to vulnerability to cavitation that appears to be governed by xylem structural properties.     

Lignification and lignin heterogeneity for various age classes of bamboo (Phyllostachys pubescens) stems

The lignification process and lignin heterogeneity of fibre, vessel and parenchyma cell walls for various age classes of bamboo stems of Phyllostachys pubescens Mazel were investigated. It was shown that protoxylem vessels lignified in the early stage of vascular bundle differentiation, metaxylem vessel and fibre walls initiated lignification from the middle lamella and cell corners after the completion of vascular bundle differentiation. Most of the parenchyma cell walls lignified after the stem reached its full height, while a few parenchyma cells remained non-lignified even in the mature culm. The cell walls of fibres and most parenchyma cells thickened further during the stem growth to form polylamellate structure and the lignification process of these cells may last even up to 7 years. The fibre walls were rich in guaiacyl lignin in the early stage of lignification, and lignin rich in syringyl units were deposited in the later stage. Vessel walls mainly contained guaiacyl lignin, while both guaiacyl and syringyl lignin were present in the fibre and parenchyma cell walls.     

Are periodic (intra-annual) tangential bands of vessels in diffuse-porous tree species the equivalent of flood rings in ring-porous species? Reproducibility and cause

Tree rings from ring-porous species have often been used as flood proxy. Many ring-porous species produce characteristic flood rings in response to stem submersion during vessel formation. Flood rings have earlywood vessels that are more numerous and/or of smaller cross-sectional area than “normal” rings. This study aimed at determining if diffuse-porous balsam poplar and trembling aspen, like ring-porous black ash, produce anatomically distinct annual tree rings in response to flooding. More specifically, we asked (i) if periodic tangential bands of vessels (hereafter PTBV) could be as easily identified/quantified as flood rings and (ii) if PTBV could be associated with spring flooding. Sampling of black ash, balsam poplar and trembling aspen trees took place along a flood exposure gradient in the floodplain of Lake Duparquet in northwestern Québec. Two observers recorded flood rings and PTBV. Consistency between observers was greatest when identifying flood rings. In both diffuse-porous species, PTBV occurred less abundantly than flood rings in black ash. They also occurred less often in balsam poplar than in trembling aspen. Years in which PTBV were initiated early in the growing season were associated with years in which flood rings occurred. Like flood rings, early occurring PTBV were more abundant in springs characterized by high mean river discharge, extensive snow cover, cold temperatures and heavy precipitation. Early-occurring PTBV dominated in flooded sites and late-occurring ones dominated in the control site. However, PTBV of the late-types were also observed in both flood exposures indicating that spring flood may not be the only factor modulating their formation. While flood rings seem to be associated with a change in the transport of growth regulators resulting from stem submergence and excess water, PTBV may be reflective of rhythmic alterations in the transport of growth regulators resulting from either water excess or deficit. Despite promising findings, many questions remain before PTBV in riparian diffuse-porous species can be widely used as a flood proxy. Why do species and individual trees differ in their ability to record them? What is the full range of environmental conditions triggering PTBV’s formation especially in unflooded sites and in the late growing season?     

九种不同材性的温带树种叶水力性状及其权衡关系

不同材性树种的解剖、叶脉分布等结构性状差异会影响树木的水分运输效率和水分利用策略, 进而限制树木的生存、生长和分布。然而, 材性对叶导水率、水力脆弱性及其潜在的权衡关系的影响尚不清楚。该研究选择东北温带森林中不同材性的9种树种(散孔材: 山杨(Populus davidiana)、紫椴(Tilia amurensis)、白桦(Betula platyphylla); 环孔材: 蒙古栎(Quercus mongolica)、水曲柳(Fraxinus mandshurica)、胡桃楸(Juglans mandshurica); 无孔材: 红皮云杉(Picea koraiensis)、樟子松(Pinus sylvestris var. mongolica)、红松(Pinus koraiensis), 测量其基于叶面积和叶质量的叶导水率(K_area和K_mass)、水力脆弱性(P₅₀)、膨压丧失点水势(TLP)及叶结构性状, 以比较不同材性树种叶水力性状的差异, 并探索叶水力效率与安全的权衡关系。结果表明: 3种材性树种的K_area、K_mass和P₅₀均差异显著(p < 0.05)。无孔材树种的K_area和K_mass最低, 而散孔材和环孔材树种差异不显著; 环孔材树种P₅₀最高, 而散孔材和无孔材树种差异不显著。K_area和K_mass均与P₅₀显著负相关(p < 0.05), 但散孔材、环孔材和无孔材树种的相关关系分别呈线性、幂函数和指数函数关系。这表明叶水力效率与安全之间存在一定的权衡关系, 但该关系受树木材性的影响。K_mass与TLP显著负相关(p < 0.01), 其中散孔材和环孔材树种呈线性负相关, 无孔材树种呈负指数函数关系; P₅₀随TLP的增加而增加, 这表明树木在面临水分胁迫时, 其质外体和共质体抗旱阻力共同协调保护叶片活细胞, 防止其水分状况到达临界阈值。K_mass与叶干物质含量、叶密度、比叶重均显著负相关, 而P₅₀与之显著正相关(p < 0.01, P₅₀与比叶重的关系除外), 表明树木叶水力特性的变化受相同叶结构特性驱动, 树木增加对水力失调的容忍需要在叶水力系统构建上增加碳投资。     

Leaf hydraulic traits and their trade-offs for nine Chinese temperate tree species with different wood properties

Aims Trees with different wood properties display variations in xylem anatomy and leaf vein structure, which may influence tree water transport efficiency and water-use strategy, and consequently constrain tree survival, growth and distribution. However, the effects of wood properties on leaf hydraulic conductance and vulnerability and their potential trade-offs at leaf level are not well understood. Our aims were to examine variations in leaf hydraulic traits of trees with different wood properties and explore potential trade-offs between leaf hydraulic efficiency and safety.
Methods Nine tree species with different wood properties were selected for measuring the leaf hydraulic traits, including three diffuse-porous species (Populus davidiana, Tilia amurensis, Betula platyphylla), three ring-porous species (Quercus mongolica, Fraxinus mandshurica, Juglans mandshurica), and three non-porous species (Picea koraiensis, Pinus sylvestris var. mongolica, Pinus koraiensis). Four dominant and healthy trees per species were randomly selected. The hydraulic traits measured included leaf hydraulic conductance on leaf area (K_area) and dry mass (K_mass) basis, leaf hydraulic vulnerability (P₅₀), and leaf water potential at turgor loss point (TLP), while the leaf structural traits were leaf dry mass content (LDMC), leaf density (LD) and leaf mass per unit area (LMA).
Important findings The K_area, K_mass, and P₅₀ differed significantly among the tree species with different woody properties (p < 0.05). Both K_area and K_mass were the lowest for the non-porous trees, and did not differ significantly between the diffuse-porous and ring-porous trees. The ring-porous trees had the highest P₅₀ values, while the diffuse-porous and non-porous trees showed no significant differences in P₅₀. Both K_area and K_mass were negatively correlated with P₅₀ (p < 0.05) for all the trees, and the relationships for the diffuse-porous, ring-porous, and non-porous trees were fitted into linear, power, exponential functions, respectively. This indicates that significant trade-offs exist between leaf hydraulic efficiency and safety. The K_mass was correlated (p < 0.01) with TLP in a negative linear function for the diffuse- and ring-porous trees and in a negative exponential function for the non-porous trees. The P₅₀ increased with increasing TLP. These results suggest that apoplastic and symplastic drought resistance are strictly coordinated in order to protect living cells from approaching their critical water status under water stresses. The K_mass was negatively correlated (p < 0.01) with LDMC, LD, or LMA, while the P₅₀ was positively correlated with LDMC and LD; this suggests that variations in K_mass and P₅₀ are driven by similar changes in structural traits regardless of wood traits. We conclude that the tree tolerance to hydraulic dysfunction increases with increasing carbon investment in the leaf hydraulic system.     

Plant growth-form alters the relationship between foliar morphology and species shade-tolerance ranking in temperate woody taxa

Variation in leaf size (area per leaf) and leaf dry weight per area (LWA) in relation to species shade- and drought-tolerance, characterised by Ellenberg's light (ELD) and water demand (EWD) values, respectively, were examined in 60 temperate woody taxa at constant relative irradiance. LWA was independent of plant size, but leaf size increased with total plant height at constant ELD. Canopy position also affected leaf morphology: leaves from the upper crown third had higher LWA and were larger than leaves from the lower third. Leaf size and LWA were negatively correlated, and leaf size decreased and LWA increased with decreasing species shade-tolerance. Mean LWA was similar for trees and shrubs, but trees had larger leaves than shrubs. Furthermore, all relationships were altered by plant growth-form: none of the qualitative tendencies was significant for trees. This implies the considerably lower plasticity of foliar parameters in trees than those in shrubs. Accordingly, shade-tolerance of trees, having relatively constant leaf structure, may be most affected by the variability in biomass partitioning and crown geometry which influence foliage distribution and spacing and finally determine canopy light absorptance. Alteration of leaf form and investment pattern for construction of unit foliar surface area which change the efficiency of light interception per unit biomass investment in leaves, is a competitive strategy inherent to shrubs. EWD as well as wood anatomy did not control LWA and leaf size, though there was a trend of ring-porous tree species to be more shade-tolerant than diffuse-porous trees. Since ring-porous species are more vulnerable to cavitation than diffuse-porous species, they may be constrained to environments where irradiances and consequently evaporative demand is lower.     

长白山阔叶树种木质部环孔和散孔结构特征的分化导致其水力学性状的显著差异

木质部的解剖结构特征对树木水分传输功能有重要的影响,阔叶树种木质部环孔和散孔结构特征的分化,很可能导致两个功能类群在水力学结构上存在显著差异,但是有关两个功能类群间细致的水力学性状的对比研究还较少,二者整枝水平的导水率及纹孔水平的细致结构差异尚未见报道.本试验以长白山阔叶红松林常见的3个环孔材和4个散孔材乔木树种为研究对象,对比了两个功能类群树种的整枝导水率(k_shoot)、枝条木质部栓塞脆弱性(p_50)等重要水力学相关生理功能特征,并分析了两个功能类群间的木质部组织水平和纹孔水平上的解剖结构特征差异.结果表明:与茎段导水率差异一致,环孔材树种的整枝导水率也显著高于散孔材,但枝条木质部气穴化抵抗力显著弱于散孔材,二者的差异反映了整枝水平上木质部导水效率和安全性之间的权衡关系,与两个功能类群的水力学生理特征存在显著差异一致,二者在最大导管长度、导管直径、纹孔开口面积、纹孔开口比例等光学和扫描电镜观测解剖结构特征上都存在显著差异;木质部解剖特征(组织水平、纹孔水平)和k_shoot、p_50等生理特征间,以及木质部不同解剖特征之间存在显著的相关,且两个功能类群遵循相同的规律,反映了木质部结构对水分传输功能的重要影响,而导水率和气穴化抵抗力对木质部对立的结构要求,体现了树木水分传输系统构建的生物物理局限性.     

Wood day capacitance is related to water content,wood density,and anatomy across 30 temperate tree species

Water released from wood during transpiration (capacitance) can meaningfully affect daily water use and drought response. To provide context for better understanding of capacitance mechanisms, we investigated links between capacitance and wood anatomy. On twigs of 30 temperate angiosperm tree species, we measured day capacitance (between predawn and midday), water content, wood density, and anatomical traits, that is, vessel dimensions, tissue fractions, and vessel–tissue contact fractions (fraction of vessel circumference in contact with other tissues). Across all species, wood density (WD) and predawn lumen volumetric water content (VWC_L-pd) together were the strongest predictors of day capacitance (r²_adj = .44). Vessel–tissue contact fractions explained an additional ~10% of the variation in day capacitance. Regression models were not improved by including tissue lumen fractions. Among diffuse-porous species, VWC_L-pd and vessel–ray contact fraction together were the best predictors of day capacitance, whereas among semi/ring-porous species, VWC_L-pd, WD and vessel–fibre contact fraction were the best predictors. At predawn, wood was less than fully saturated for all species (lumen relative water content = 0.52 ± 0.17). Our findings imply that day capacitance depends on the amount of stored water, tissue connectivity and the bulk wood properties arising from WD (e.g., elasticity), rather than the fraction of any particular tissue.     

东北主要树种光合作用可行的离体测定方法

树木光合作用的测定常因植株高大而难以开展, 其中离体测定是解决途径之一。但离体测定的方法及其可靠性因树种而异。选取东北东部温带森林中特性各异的7种主要树种: 针叶树(红松(Pinus koraiensis)、长白落叶松(Larix olgensis))、散孔材(白桦(Betula platyphylla)、胡桃楸(Juglans mandshurica))和环孔材(水曲柳(Fraxinus mandshurica)、黄榆(Ulmus macrocarpa)、蒙古栎(Quercus mongolica)), 首先采用光合速率恢复到光合诱导前稳定值90%的时间(T₉₀)长短和叶片蒸腾速率(E)的大小评估离体叶片水分供应状况及其光合活力, 以此确定较优的离体测定方案; 同时, 观测离体叶片的光合活力稳定时间; 最后通过比较原位测定和采用所确定的较优离体方案测定的各树种叶片气体交换参数, 论证采用离体测定光合作用的可靠性。结果表明: 除蒙古栎外的6个树种的离体叶片均具有较高、较稳定的水分供应和光合活力。离体枝条或复叶插入水中, 环剥去除切口处3 cm左右的韧皮部和剩余叶片的方法, 是这6个温带树种叶片光合能力的较优离体测定方法。6个树种叶片的T₉₀受树木特性的影响而差异显著(p < 0.05), 其中环孔材树种的T₉₀显著高于散孔材和针叶树种。6个树种离体叶片在1 h内均有较高、较稳定的水分供应和光合活力。在此期间离体所测得的绝大多数叶片的气体交换参数与其原位测定值之间的差异不显著。该研究提出了可行的树木叶片光合作用的离体测定方案, 适用于蒙古栎以外的其他6个温带树种。     

Auxin promotes dormancy callose removal from the phloem ofMagnolia kobus and callose accumulation and earlywood vessel differentiation inQuercus robur

During winter, the phloem of the diffuse-porous tree magnolia (Magnolia kobus DC.) is dormant and is characterized by heavy deposits of dormancy callose. Application of 1-naphthaleneacetic acid (NAA) to either the top or the lower ends of excised dormant branches before bud break resulted in the removal of the dormancy callose from the sieve tubes. In both intact and auxintreated branches, callose degradation occurred first in the recently formed sieve tubes. There was no new vessel differentiation in magnolia before bud break. In contrast, the sieve tubes of the ring-porous oak (Quercus robur L.), which possess massive dormancy callose deposits during winter, were almost callose-free just before bud break. Application of auxin to the top of excised branches before bud break resulted in callose accumulation on the most recently formed sieve tubes. The first earlywood vessels were evident in oak before bud break, and their numbers were increased by auxin application. The early development of phloem and xylem (before bud break) in ring-porous species is an ecological adaptation which prepares the vascular system of these trees to function immediately at the beginning of their growing season which is relatively short.     

Wood formation during ex vitro acclimatisation in micropropagated true service tree (<Emphasis Type="Italic">Sorbus domestica</Emphasis> L.)

Micropropagated plantlets derived from a superior 90+-year-old slow-growing true service tree (Sorbus domestica L.) have been successfully acclimatised to the ex vitro environment. The temporal pattern of developmental changes was examined in relation to secondary xylem growth during ex vitro acclimatisation. In vitro rooted plantlets already initiated lignification of secondary xylem cells. During early days after transfer to ex vitro conditions, the growth of woody tissue was slow. The most prominent increase in woody tissue development occurred between days 7 and 35. From days 35 to 63, sizes of vessel lumen areas significantly increased. In developing woody tissue, a characteristic diffuse-porous pattern of roughly even vessel area distribution throughout the growing season, typical for mature wood, was not followed. The proportion of woody area occupied by vessels was significantly higher in stems of fully acclimatised plantlets than in stems sampled 35 days after transfer. On day 63 after transfer, a proportion of woody tissue area in fully acclimatised plantlets represented up to 14.8% of the stem area. Early formation of wood during ex vitro acclimatisation provides brittle plantlets with a mechanical support to cope better with deformations and mechanical injuries during handling at the subsequent transplantations.     

How reliable is the double‐ended pressure sleeve technique for assessing xylem vulnerability to cavitation in woody angiosperms?

The reliability of a double-ended pressure sleeve technique was evaluated on three woody angiosperm species with contrasting maximum vessel lengths. Vulnerability curves (VCs) were constructed by varying sample length and the size of the pressure sleeves. VCs were compared against curves obtained with reference techniques. For the two diffuse-porous species, Betula pendula and Prunus persica, VCs built with shoot segments shorter than maximum vessel length strongly overestimated species vulnerability. Furthermore, increasing the size of the pressure sleeve also tended to lead to overestimated VCs. For the ring-porous species Quercus robur, the technique strongly overestimated vulnerability to embolism, whatever the sample length or chamber tested. In conclusion, the double-ended pressure sleeve technique only gives reliable VCs on diffuse-porous angiosperms with short pressure sleeves, only when segments are longer than maximum vessel length.     

Periodicity of leaf growth and leaf dry mass changes in the evergreen and deciduous species of Southern Assam,India

The study described patterns of leaf dry mass change, leaf mass per area (LMA), relative growth rate and leaf life span (LL) for 14 evergreen and 7 deciduous species of a tropical forest of Southern Assam, India. Leaf expansion in both the groups was, in general, completed before June (i.e. well before the onset of monsoon rains). Although leaf dry mass during leaf initiation phase was significantly higher (P < 0.01) in evergreen species than in deciduous species, at the time of full leaf expansion, average leaf dry mass relative to the peak leaf dry mass, realised by the evergreen species was lower (66 %) than for deciduous species (76 %). Leaf dry mass increase in both groups continued after leaf full expansion. Evergreen species had a longer leaf dry mass steady phase than deciduous species (2–6 vs 2–3 months). Average LMA of mature leaves for evergreen species (77.43 g m^?2) was significantly greater than that of deciduous species (48.43 g m^?2). LL ranged from 165 days in Gmelina arborea (deciduous) to 509 days in Dipterocarpus turbinatus (evergreen). LMA was correlated positively with LL, indicating that evergreen species with higher leaf construction cost retain leaves for longer period to pay back. The average leaf dry mass loss before leaf shedding was greater (P < 0.01) for deciduous species (30.29 %) than for evergreen species (18.31 %). Although the cost of leaf construction in deciduous species was lower than for evergreen species, they replace leaves at a faster rate. Deciduous species perhaps compensate the cost involved in faster leaf replacement through higher reabsorption of dry mass during senescence, which they remobilise to initiate growth in the following spring when soil resources remain limiting.     

Distribution of Vessel Ends in Stems of some Diffuse- and Ring-porous Trees: The Nodal Regions as 'Safety Zones' of the Water Conducting System

We report measurements of the number of vessels ending withinthe nodes in comparison with that in the internodes Such measurementshave been carried out during autumn 1982 and 1983 in 1-year-oldtwigs of three species with diffuse-porous wood (Vitis vintferaL. Populus deitoides Bartr and Olea europaea L) and three ring-poroustrees (Juglans nigra L, Castanea sativa Mill, Sophora JaponicaL) In all three species with diffuse-porous wood, a significantlyhigher percentage of vessels ending in the nodes (at the leafgap) was recorded when compared with that in the internodesNo significant differences were found between nodes and internodesin this respect in ring-porous trees. Since vessel ends arecapable of screening out gaseous emboli and/or particles biggerthan 1 µm in diameter, we interpret the nodes of diffuse-poroustrees as stem zones providing safety for the water conductingsystem .The reason why ring-porous trees are likely not to needsuch ‘safety zones’ is also discussed Vitis vinifera L, grapevine, Populus deltoides Bartr, poplar, Olea europaea L, olive, Juglans nigra L, Eastern black walnut, Castanea sativa Mill, European chestnut, Sophora japonica L, Japanese pagoda tree, vessel ends, nodes, internodes     

How are leaves plumbed inside a branch? Differences in leaf-to-leaf hydraulic sectoriality among six temperate tree species

The transport of water, sugar, and nutrients in trees is restricted to specific vascular pathways, and thus organs may be relatively isolated from one another (i.e. sectored). Strongly sectored leaf-to-leaf pathways have been shown for the transport of sugar and signal molecules within a shoot, but not previously for water transport. The hydraulic sectoriality of leaf-to-leaf pathways was determined for current year shoots of six temperate deciduous tree species (three ring-porous: Castanea dentata, Fraxinus americana, and Quercus rubra, and three diffuse-porous: Acer saccharum, Betula papyrifera, and Liriodendron tulipifera). Hydraulic sectoriality was determined using dye staining and a hydraulic method. In the dye method, leaf blades were removed and dye was forced into the most proximal petiole. For each petiole the vascular traces that were shared with the proximal petiole were counted. For other shoots, measurements were made of the leaf-area-specific hydraulic conductivity for the leaf-to-leaf pathways (k(LL)). In five out of the six species, patterns of sectoriality reflected phyllotaxy; both the sharing of vascular bundles between leaves and k(LL) were higher for orthostichous than non-orthostichous leaf pairs. For each species, leaf-to-leaf sectoriality was determined as the proportional differences between non-orthostichous versus orthostichous leaf pairs in their staining of shared vascular bundles and in their k(LL); for the six species these two indices of sectoriality were strongly correlated (R2=0.94; P <0.002). Species varied 8-fold in their k(LL)-based sectoriality, and ring-porous species were more sectored than diffuse-porous species. Differential leaf-to-leaf sectoriality has implications for species-specific co-ordination of leaf gas exchange and water relations within a branch, especially during fluctuations in irradiance and water and nutrient availability.     

The Relationship between Endogenous Hormone Levels in the Plant and Seasonal Aspects of Cambial Activity

The auxin levels at different heights in a ring-porous (Ulmusglabra) and a diffuse-porous (Populus trichocarpa) tree werefollowed in spring. There was shown to be a correlation betweenthe pattern of spread of cambial activity and auxin gradients.The observed continuation of cambial activity after cessationof extension growth in ring-porous species is apparently dueto the fact that the mature leaves produce auxin, whereas littleauxin is produced by the leaves of diffuse-porous species underthese conditions. The spring/summerwood transition in ring-porousspecies can be related to a fall in auxin level at the timethat shoot extension-growth ceases. There is evidence of phloemproduction after the cessation of xylem production in Ailanthusaltissima and Robinia pseudacacia, but not in Betula pubescentand Acer pseudoplatanus. It is suggested that, in Ailan-thus,phloem production continues because high endogenous gibberellinlevels are present after the auxin level has been reduced byshort-day treatment.     

散孔材和环孔材树种叶水分传输能力及其与抗旱性的关系

选取树龄相同的3种散孔材(杨树、梧桐和樱花)和3种环孔材(刺槐、合欢和白蜡)树种,用3种不同方法(解剖法、加压法和水容法)研究了其叶水力导度的差异及与抗旱性(PV曲线参数)的关系.结果显示:解剖法估算的最大叶水力导度高于加压法和水容法,加压法和水容法在6个树种中的5个上测定值完全一致,3种散孔材与环孔材树种的叶最大水力导度无显著差异.3种散孔材树种的饱和渗透势和膨压损失点渗透势与3种环孔材相比差异不大,但膨压损失点的相对含水量则低于环孔材树种,质外体含水量高于环孔材树种,导致其综合抗旱性指数也高于3种环孔材树种.研究表明,散孔材和环孔材树种的叶最大水力导度与其抗旱性之间并无显著相关关系.