根霉木质部的结构和功能响应。干旱和高盐条件下的幼苗

N. Dissanayake, K. Kodikara, S. Premachandra, L. Jayatissa
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引用次数: 4

摘要

红树林幼苗的水分迁移经常受到干旱、高盐度及其频繁变化等水分胁迫条件的影响。因此,本研究旨在研究木根茎木质部组织的解剖反应和水导性。在不同干旱程度[25%、~50%和~100%持水量]和土壤盐度[高盐度(35 psu)、中盐度(15 psu)和淡水(0 psu)]下,红树种植中常见的树种。在木材解剖反应中,在25%和50% WHCs和高盐度处理下生长的植物,血管密度、血管组(P<0.001)和血管狭窄(P<0.001)显著增加。所有这些解剖反应都是为了避免在缺水条件下常见的血管空化。结果表明,当田间容量为WHC的50%或更低,盐度为35 psu或更高时,水导面积、容器面积和水力导率均有所减少(P<0.05)。总体而言,在施加水分胁迫的条件下,长尾麻幼苗的水分利用效率显著降低,进一步表明这种胁迫条件直接影响了种植苗的成活率,表现为25%和50%的whc显著低成活率和高盐度。因此,强烈建议对泻湖水文进行深入研究,包括淹没水位、水深、盐度和正确潮汐定位的选择,作为种植红树林的先决条件。关键词。水利建筑,水力传导性,红树林,恢复,水资源压力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Structural and functional responses of xylem in Rhizophora mucronata Lam. seedlings under drought and hypersaline conditions
Water translocation in mangrove seedlings is often affected by water stress conditions such as drought, hyper-salinities and their frequent variations. This study was therefore aimed at studying the wood anatomical responses of xylem tissue and hydraulic conductivity of Rhizophora mucronata Lam., a common species in mangrove planting, under different levels of drought [25%, ~50% and ~100% of water holding capacity (WHC)] and soil salinity [high salinity (35 psu), moderate salinity (15 psu) and freshwater (0 psu)]. As wood anatomical responses, significantly higher vessel density, vessel grouping (P<0.001) along with narrow vessel elements (P<0.001) were observed in plants grown in the 25% and 50% WHCs and high salinity treatments. All these anatomical responses are more directed towards avoidance of vessel cavitation which is commonly found under water deficit conditions. The results showed that R. mucronata plants failed to maintain efficient transportation of water when the field capacity was 50% of WHC or lower and the level of salinity was 35 psu or greater, as evident by the reduction of water conductive areas, vessel areas and hydraulic conductivity (P<0.05). Overall, water use efficiency of R. mucronata seedlings under the imposed water stress conditions has remarkably reduced and it further indicated that such imposed stress conditions directly affect the survival of planted seedlings as depicted by the significantly low survival in 25% and 50% of WHCs and high salinity. Therefore, in-depth study on lagoon hydrology including inundation levels, water depth, salinity and the selection of correct tidal positioning is highly recommended as prerequisites in mangrove planting. Keywords. Hydraulic architecture, hydraulic conductivity, mangroves, restoration, water stress.
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