Department of Environmental Science, Hanyang University, Seoul 04763, Republic of Korea.
Department of Life Science and Research Institute for Natural Sciences, Hanyang University, Seoul 04763, Republic of Korea.
Int J Environ Res Public Health. 2023 Feb 24;20(5):4099. doi: 10.3390/ijerph20054099.
To study the effect of rainfall patterns on diatom communities in four major central western streams on the Korean Peninsula during the monsoon seasons of 2013 through 2015, we measured precipitation, environmental factors, and epilithic diatoms at 42 sites before (May) and after (August and September) each monsoon. The Mangyeonggang river and Sapgyocheon stream (SS) had a high percentage of low-permeability soil, and the stream had the highest proportion (49.1%) of surrounding land in urban areas. Precipitation and precipitation frequency was closely correlated with electrical conductivity and nutrients, and this was particularly evident in SS. Epilithic diatom abundance for the most abundant species as, , decreased in the stream in 2013 and 2014 and increased in 2015 when precipitation and precipitation frequency were low. This was not clearly distinguishable in the ecological characteristics of each watercourse's indicator species, except in SS. The dynamic community index was highest in 2015 (ca. 5.50), and the annual changes in the index were clearly shown in SS. The precipitation pattern and the dynamic community index were negatively correlated (r = -0.026~-0.385), and the precipitation within 2 weeks (r = -0.480 for SS) before the second sampling and the frequency of 10 mm of precipitation were closely correlated in the stream (r = -0.450 for SS). The distribution of epilithic diatoms in the four watercourses is therefore affected by monsoon precipitation and precipitation frequency, and the dynamic community index is determined by soil characteristics and land use.
为了研究 2013 年至 2015 年季风季节朝鲜半岛四条主要中西部河流中甲藻群落对降雨模式的影响，我们在每个季风季节前（5 月）和后（8 月和 9 月）在 42 个地点测量了降水、环境因素和附生甲藻。望祥江和沙平沼川（SS）具有高比例的低渗透性土壤，并且该河流周围土地有最高比例（49.1%）位于城市地区。降水和降水频率与电导率和养分密切相关，在 SS 中尤为明显。最丰富物种的附生甲藻丰度，在 2013 年和 2014 年减少，而在降水和降水频率较低的 2015 年增加。这在各水道指示物种的生态特征中并不明显，除了 SS。动态群落指数在 2015 年最高（约 5.50），并且该指数的年度变化在 SS 中明显显示。降水模式和动态群落指数呈负相关（r = -0.026~-0.385），在第二次采样前两周内的降水（对于 SS 为 r = -0.480）和 10 毫米降水频率密切相关（对于 SS 为 r = -0.450）。因此，四条河流中甲藻的分布受季风降水和降水频率的影响，而动态群落指数则由土壤特征和土地利用决定。
