文章基本信息

标题：DAMAGE AND RECOVERY FROM ENHANCED UV-B EXPOSURE IN BRYUM ARGENTEUM AND DIDYMODON VINEALIS FROM BIOLOGICAL SOIL CRUSTS
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作者：Gang Li ; Yongping Wei ; Lichao Liu 等
期刊名称：Fresenius Environmental Bulletin
印刷版ISSN：1018-4619
出版年度：2015
卷号：24
期号：3A
页码：939-946
语种：English
出版社：PSP Publishing
摘要：We evaluated the influence of exposure to ultravioletB (UV-B) radiation (2.75, 3.08, 3.25 and 3.41 W m-2), and recovery on returning to visible light conditions (150 μmol m-2 s-1) on the physiological properties related to photosynthesis in the mosses Bryum argenteum Hedw. and Didymodon vinealis (Brid.) Zand. Specimens of B. argenteum and D. vinealis were isolated from biological soil crusts (BSCs) from the Tengger Desert, northern China. The results showed that UV-B radiation decreased the Chl fluorescence parameters, photosynthetic pigments, soluble protein and malondialdehyde (MDA) contents of B. argenteum and D. vinealis, and that the degree of negative effects was in proportion to the intensity of UV-B radiation. The Chl fluorescence parameters, photosynthetic pigments, soluble protein and MDA contents of B. argenteum and D. vinealis increased when they were returned to visible light after UV-B radiation. There were gradual decreases in recovery ability with increasing UV-B intensity. Experiments conducted to determine the ability of BSCs to recover from UV-B stress when exposed at different intensities show they have some capacity to recover from the stress. Enhanced UV-B radiation causes changes in the composition and structure of BSCs that could impair their protective ecological functions in desert areas.
关键词：global climate change; mosses; photosynthesis; physiological properties; repair capacity