Role of weather and water quality in population dynamics of submersed macrophytes in the tidal Potomac River
Role of weather and water quality in population dynamics of submersed macrophytes in the tidal Potomac River
复制标题
天气和水质对潮汐波托马克河沉水植物种群动态的作用
DOI：
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发表时间：
1994
期刊：
影响因子：
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通讯作者：
Michael Turtora
中科院分区：
文献类型：
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作者：
V. Carter;Nancy B. Rybicki;J. M. Landwehr;Michael Turtora
1980年至1989年的天气和水质数据与华盛顿，华盛顿特区附近的波托马克河潮汐中沉水植物种群的波动相关，阐明因果关系并解释种群动态。1980年，当平均生长季节Secchi深度<0.60 m时，这两个河段都是无植被的。1983年，在上游潮汐河流中的大型植物复苏与生长季节的Secchi深度为0.86 m，总悬浮固体（TSS）为17.7 mg l−1，叶绿素a浓度为15.2 μg l−1，显着高于平均可用日照百分比，显着低于平均风速。从1983年至1989年，平均季节性Secchi深度<0.65 m were associated with decrease in plant coverage and mean seasonal Secchi depths >0.65与植物覆盖的增加。平均季节性Secchi深度的变化与平均季节性TSS和叶绿素a浓度的变化有关;平均Secchi深度>0.65通常发生在季节性平均TSS <19 mg l−1和季节性平均叶绿素a浓度≤15 μg l−1时。在感潮河流中，叶绿素a和TSS与植物生长高度相关，而在感潮河流中，Secchi深度与植物生长高度相关。风速对两个河段的植物生长都有重要影响。
Weather and water-quality data from 1980 to 1989 were correlated with fluctuations in submersed macrophyte populations in the tidal Potomac River near Washington, D.C., to elucidate causal relationships and explain population dynamics. Both reaches were unvegetated in 1980 when mean growing-season Secchi depths were <0.60 m. Macrophyte resurgence in the upper tidal river in 1983 was associated with a growing-season Secchi depth of 0.86 m, total suspended solids (TSS) of 17.7 mg l−1, chlorophyll a concentrations of 15.2 μg l−1, significantly higher than average percent available sunshine, and significantly lower than average wind speed. From 1983 to 1989, mean seasonal Secchi depths <0.65 m were associated with decrease in plant coverage and mean seasonal Secchi depths >0.65 were associated with increases in plant coverage. Changes in mean seasonal Secchi depth were related to changes in mean seasonal TSS and chlorophyll a concentration; mean Secchi depths >0.65 generally occur when seasonal mean TSS is <19 mg l−1 and seasonal mean chlorophyll a concentration is ≤15 μg l−1. Secchi depth is highly correlated with plant growth in the upper tidal river and chlorophyll a and TSS with plant growth in the lower tidal river. Wind speed is an important influence on plant growth in both reaches.