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PLANT INVASION OF NEWLY EXPOSED HYPERSALINE DEAD SEA SHORES

机译:植物入侵的新高盐死海

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THE level of the Dead Sea, the lowest (about -400 m) and one of the most salty (salinity about 340 g l(-1))lakes on earth, is lowering at a rate of approximately 0.5 m annually owing to extensive exploitation of its main perennial tributary (the Jordan River) and the extreme aridity of the region (annual precipitation is about 60 mm)(1). Consequently, new hypersaline sea shores are exposed, forming a unique, originally sterile ecosystem. The first plants invade these newly exposed shores after several years while soil water salinity is still extremely high, Here we use stable isotopes of oxygen and hydrogen to show that a variety of such perennial pioneer plants are able to make use of occasional floodwater which is distinct from the bulk of the hypersaline soil water found in their root zone. Our results provide new insight into the ways in which plants can invade extremely hostile environments and extend their ecological limits of distribution. [References: 24]
机译:死海的水位,最低(约-400 m),也是地球上最咸的盐湖之一(盐度约340 gl(-1)),由于对海藻的广泛开采,每年以约0.5 m的速度下降。其主要的多年生支流(约旦河)和该地区的极端干旱(年降水量约60毫米)(1)。因此,新的高盐海岸被暴露在外,形成了一个独特的,最初是无菌的生态系统。几年后,第一批植物入侵了这些新近暴露的海岸,而土壤水盐度仍然非常高。在这里,我们使用稳定的氧和氢同位素来表明,各种这样的多年生先驱植物能够利用偶尔出现的洪水取自其根部区域的大量高盐分土壤水。我们的结果为植物入侵极端敌对环境并扩展其生态分布极限提供了新的见解。 [参考:24]

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