Particulate pollutants are capable to 'degrade' epicuticular waxes and to decrease the drought tolerance of Scots pine (Pinus sylvestris L.)
Particulate pollutants are capable to 'degrade' epicuticular waxes and to decrease the drought tolerance of Scots pine (Pinus sylvestris L.)
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DOI：
10.1016/j.envpol.2013.04.041
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发表时间：
2014-01-01
影响因子：
8.9
通讯作者：
Pariyar, Shyam
中科院分区：
文献类型：
--
作者：
Burkhardt, Juergen;Pariyar, Shyam
空气污染导致针叶树表皮蜡的无定形外观，通常称为蜡的“退化”或“侵蚀”，这通常与树木的损害症状有关，例如冬季干燥。以前的研究主要集中在蜡的化学性质上，但收效甚微。在这里，我们提出了一个假设，即“蜡降解”和树木耐旱性下降可能是由于盐颗粒沉积在针叶上的物理因素造成的。用干气溶胶或50 mM不同盐溶液喷洒松树幼苗。在环境扫描电子显微镜下，这些针叶经历了湿度的变化，导致盐在针叶表面膨胀并进入针叶上位腔。研究了溶解盐覆盖管状蜡原纤维形成无定形蜡样的过程。喷施松苗的最小表皮导度增大。气溶胶沉降可能会“降解”蜡，降低树木的耐旱性。到目前为止，在空气污染研究中还没有充分考虑到这些影响。(C) 2013 Elsevier Ltd.版权所有。
Air pollution causes the amorphous appearance of epicuticular waxes in conifers, usually called wax 'degradation' or 'erosion', which is often correlated with tree damage symptoms, e.g., winter desiccation. Previous investigations concentrated on wax chemistry, with little success. Here, we address the hypothesis that both 'wax degradation' and decreasing drought tolerance of trees may result from physical factors following the deposition of salt particles onto the needles.Pine seedlings were sprayed with dry aerosols or 50 mM solutions of different salts. The needles underwent humidity changes within an environmental scanning electron microscope, causing salt expansion on the surface and into the epistomatal chambers. The development of amorphous wax appearance by deliquescent salts covering tubular wax fibrils was demonstrated. The minimum epidermal conductance of the sprayed pine seedlings increased.Aerosol deposition potentially 'degrades' waxes and decreases tree drought tolerance. These effects have not been adequately considered thus far in air pollution research. (C) 2013 Elsevier Ltd. All rights reserved.