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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Experimental investigations into the influence of biofilms and environmental factors on short-term microtopographic fluctuations of supratidal sandstone
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Experimental investigations into the influence of biofilms and environmental factors on short-term microtopographic fluctuations of supratidal sandstone

机译：生物膜对生物膜和环境因素对水晶砂岩短期微波波动影响的实验研究

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In this study laboratory experiments were used to explore the role of biofilms, formed by lithobiontic microorganism communities, in causing hourly surface changes of supratidal sandstone and the potential linkage to long-term rock decay. To isolate the influence of individual environmental factors (temperature and humidity) on rock surface changes (expansion and contraction), a colonized (biofilm-covered) and a non-colonized sandstone block (biofilm-free) underwent the same univariate microclimatic simulations closely controlled by an environmental chamber. Simulations were run under three different light conditions, with a natural light lamp on, on and off at 20-min intervals and off, to investigate the impact of light on rock surface dynamics. Measured with a traversing micro-erosion meter (TMEM), two-hourly microtopographic fluctuations of these two sandstone blocks were compared in the same environment. Induced by microclimatic variations, surface movements of significantly higher magnitude (12-120% under varying tempeature and 121-154% under varying humidity) and different change patterns were observed on the colonized block, indicating the primary role of biofilm in driving microtopographic fluctuations of supratidal sandstone. However, thermally driven changes of similar magnitude and pattern were observed on both surfaces, suggesting other mechanisms also operating on the non-colonized rock surface in this process. Due to the sensitivity of biofilm microorganism communities to light, the magnitude and pattern of surface changes was impacted by light condition. Because biofilms increased the magnitude and number of cycles of expansion and contraction of the experimental rock surface, we propose that lithobiontic biofilms facilitate the detachment of grains and granular disintegration on the rock surface, consequently contributing to rock decay and accelerating the rate of breakdown of supratidal rock. This short-term episode therefore needs to be superimpose
机译：在该研究中，实验室实验用于探讨锂离子微生物群群的生物膜的作用，导致对水石砂岩的每小时表面变化以及对长期岩石衰减的潜在纽带。为了隔离个体环境因素（温度和湿度）对岩石表面的影响（膨胀和收缩），殖民化（生物膜覆盖）和非殖民化砂岩嵌段（生物膜 - 无凝聚）接受了相同的单变量微跨度模拟密切控制由环境室。模拟在三种不同的光线条件下运行，在20分钟间隔和关闭时，自然光灯接通，开启和关闭，以研究光对岩石表面动力学的影响。用遍历的微侵蚀仪表（TMEM）测量，在相同的环境中比较了这两个砂岩块的两小时的微选色波动。通过微跨度变化引起的，在殖民化嵌段上观察到显着更高的幅度（在不同的湿度下的12-120％和121-154％下121-154％）和不同的变化模式，表明生物膜在驱动微波波动方面的主要作用上浸砂岩。然而，在两个表面上观察到热驱动的类似幅度和图案的变化，这表明在该过程中的非殖民岩石表面上的其他机制也在非殖民化岩石表面上运行。由于生物膜微生物群落对光的敏感性，表面变化的幅度和模式受到轻微条件的影响。因为生物膜提高了实验岩表面的膨胀和收缩循环循环的级数和数量，我们提出了岩性生物膜促进了谷物和颗粒崩解在岩石表面上的脱落，因此有助于岩石衰减并加速超衰变的崩溃率岩石。因此，这种短期发作需要叠加

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