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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Rock-protecting seaweed? Experimental evidence of bioprotection in the intertidal zone
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Rock-protecting seaweed? Experimental evidence of bioprotection in the intertidal zone

机译：保护岩石的海藻？潮间带生物保护的实验证据

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Biogeomorphological processes are an important component of dynamic intertidal systems. On rocky shores, the direct contribution of microorganisms, plants and animals to weathering and erosion is well known. There is also increasing evidence that organisms can alter rock breakdown indirectly, by moderating temperature and moisture regimes at the rock-air interface. These influences have been purported to represent mechanisms of bioprotection, by buffering microclimatic fluctuations associated with weathering processes such as wetting and drying and salt crystallization. However, virtually nothing has been done to test whether microclimatic buffering translates to differences in actual rock breakdown rates. Here we report a preliminary laboratory experiment to assess how an artificial canopy (chosen to represent seaweed) affects mechanical rock breakdown. Using a simplified and accelerated thermal regime based on field data from a rocky shore platform in southern England, UK, we find that breakdown (mineral debris release) of mudstone covered with a canopy is reduced by as much as 79% relative to bare rock after around 100 thermal cycles. Reduction in rock surface hardness (measured using an Equotip device) was also greater for bare rock (17%) compared to covered rock (10%) over this period. Measurements of salt crystal formation indicate that the mechanism driving these differences was a reduction in the frequency of crystallization events, via moisture retention and shading of the rock surface. Copyright (c) 2015 John Wiley & Sons, Ltd.
机译：生物地貌过程是潮间带动态系统的重要组成部分。在多石的海岸上，微生物，植物和动物对风化和侵蚀的直接贡献是众所周知的。越来越多的证据表明，有机物可以通过调节岩石与空气界面的温度和湿度来间接改变岩石的破裂。据称，这些影响通过缓冲与气候过程相关的微气候波动（如润湿和干燥以及盐结晶）来代表生物保护机制。但是，几乎没有任何事情可以测试微气候缓冲是否转化为实际岩石破裂速率的差异。在这里，我们报告了一项初步的实验室实验，以评估人造冠层（选择代表海藻）如何影响机械性岩石破裂。基于英国南部英格兰多岩石海岸平台的现场数据，基于简化和加速的热力状态，我们发现，覆盖后的覆盖层覆盖的泥岩的分解（矿物碎片释放）相对于裸岩减少了79％大约100个热循环。在这段时期内，裸岩（17％）的岩石表面硬度（使用Equotip装置测量）的降低幅度也大于覆岩（10％）。盐晶体形成的测量表明，驱动这些差异的机制是通过水分保留和岩石表面阴影降低了结晶事件的频率。版权所有（c）2015 John Wiley＆Sons，Ltd.

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