Does salinity influence the distribution of exotic willows (Salix spp.) along the Lower River Murray?
Does salinity influence the distribution of exotic willows (Salix spp.) along the Lower River Murray?
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DOI：
10.1071/mf03035
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发表时间：
2003-01-01
影响因子：
1.8
通讯作者：
Walker, KF
中科院分区：
文献类型：
--
作者：
Kennedy, SA;Ganf, GG;Walker, KF
垂柳柳（Salix babylonica）和裂柳（crack willow S. fragilis）在澳大利亚南澳大利亚曼纳姆和惠灵顿之间的穆雷河（River Murray）河岸植被中占主导地位。脆弱葡萄球菌的存在被证实，超越了早先非正式提及的S. x rubens。在该地区，S. babylonica以雌性为代表，S. fragilis以雄性为代表。这两种植物的开花时间重叠，但前者的生长季节开始得更早。没有发现杂交的证据，尽管这不是决定性的。在墨累大桥上游最常见的是babylonica柳，而S. fragilis主要分布在下游。1999年的一项野外调查表明，土壤水分电导率的估计值在河流沿线不同地点之间存在差异（中位数为6.0 mS cm(-1)），但这并未反映在物种的分布中。在一项温室试验中，两种植物的扦插都被证明不耐超过7毫微米（-1）的电导率。在田间，叶面含盐量表明，尽管生长在中等盐碱度的土壤中，但这两种植物都没有盐胁迫。此外，树木似乎更容易接触到含盐量较低的河水，而不是土壤中的河水。这两种植物在该地区的分布更能反映种植历史，而不是耐盐性。
The weeping willow Salix babylonica and crack willow S. fragilis dominate the riparian vegetation of the River Murray between Mannum and Wellington, South Australia, Australia. The presence of S. fragilis is confirmed, over-riding earlier, informal references to S. x rubens. In this region S. babylonica is represented by females and S. fragilis is represented by males. The flowering times of the two species overlap but the growing season begins earlier for the former. No evidence of hybridization was found, although this is not conclusive. Salix babylonica is most common upstream of Murray Bridge whereas S. fragilis occurs mainly downstream. A field survey in 1999 showed that estimated soil water conductivity varied between sites ( median 6.0 mS cm(-1)) along the river, but this was not reflected in the distributions of the species. In a glasshouse experiment, cuttings of both species proved intolerant of conductivities exceeding 7 mS cm(-1). In the field, foliar salt levels indicated that neither species was salt-stressed, despite growing in moderately saline soil. Also, it appears that the trees may access less saline river water in preference to that in the soil. The distributions of the two species in this region could reflect the history of planting rather than salinity tolerance.