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Fine sediment affecting the tearing-off process of benthic algae in a shallow river

机译：细沉积物影响浅水河流中底栖藻类的撕裂过程

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In recent years, many reports have described the increase of fine sediment (FS) load, such as silt and clay of <2 mm diame-ter, in rivers and streams that result from human activities such as farm development and channel works (CLINE et al. 1982, RICHARDS et al. 1993). Fine sediment negatively influences the lotic ecosystem in the stream (RYAN 1991), and deposition on streambeds destroys fish spawning habitats and creates respi-ratory problems for aquatic insects. It also causes a propor-tional reduction in the organic matter contents in periphyton (GRAHAM 1990). Accumulation of FS on benthic algae may affect their biomass due to photosynthetic problem caused by light limitation. Benthic algal communities developed on streambeds lose their biomass gradually under normal stream conditions, or rapidly in floods due to the shear force of the current. The detached algal body arc carried downstream as suspended organic matters by the current. Although this tearing-off pro-cess is important from the aspect of organic load to the lower reaches of the stream, few studies have been conducted to assess the factors that affect the process (HORNER et al. 1990, BIGGS & THOMSEN 1995). This study was designed to clarify the relationship between FS deposition, the development of ben-thic algae, and theirtearing-off process on streambeds in the rif-fle.
机译：近年来，许多报道已经描述了细沉积物（FS）负荷的增加，例如淤泥和粘土的河流和河流和河流，这些河流和农业活动（如农业开发和渠道工程）（Cline et al。1982，Richards等人1993）。细沉积物对溪流（Ryan 1991）中的大众生生态系统产生负面影响，并且在流侧沉积摧毁了鱼类产卵栖息地，并为水生昆虫创造了呼吸侵犯问题。它还导致Periphyton（Graham 1990）中的有机物质含量的助理降低。由于光合作用引起的光合问题，FS对底栖藻类的累积可能会影响它们的生物质。由于电流的剪切力，流在流动的藻类群落中开发的僵尸藻类社区在正常流条件下逐渐失去了它们的生物量，或者迅速泛滥。通过电流将分离的藻类弧作为悬浮有机物载下游。虽然这种撕裂的亲肠道从有机负荷的方面很重要，但是已经进行了很少的研究以评估影响该过程的因素（Horner等，1990，Biggs＆Thomsen 1995）。本研究旨在阐明FS沉积，本地藻类的发展与流失在流失中的流动的关系。

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