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首页> 外文期刊>Journal of South American earth sciences >Connectivity processes and riparian vegetation of the upper Parana River, Brazil
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Connectivity processes and riparian vegetation of the upper Parana River, Brazil

机译：巴西巴拉那河上游的连通性过程和河岸植被

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In fluvial systems; the relationship between a dominant variable (e.g. flood pulse) and its dependent ones (e.g. riparian vegetation) is called connectivity. this paper analyzes the connectivity elements and processes controlling riparian vegetation for a reach of the upper parana river (brazil) and estimates the future changes in channel-vegetation relationship as a consequence of the managing of a large dam. the studied reach is situated 30 km downstream from the porto primavera dam (construction finished in 1999). through aerial photography (1:25;000; 1996); rgb-cbers satellite imagery and a previous field botany survey it was possible to elaborate a map with the five major morpho-vegetation units:treedominated natural levee;shrubby upper floodplain;shrub-herbaceous mid floodplain;grassherbaceous lower floodplain and shrub-herbaceous flood runoff channel units. by use of a detailed topographic survey and statistical tools each morpho-vegetation type was analyzed according to its connectivity parameters (frequency; recurrence; permanence; seasonality; potamophase; limnophase and fcq index) in the pre- and post-dam closure periods of the historical series. data showed that most of the morpho-vegetation units were predicted to present changes in connectivity parameters values after dam closing and the new regime could affect; in different intensity; the river ecology and particularly the riparian vegetation. the methods used in this study can be useful for dam impact studies in other south american tropical rivers.
机译：在河流系统中；主变量（例如洪水脉冲）与其因变量（例如河岸植被）之间的关系称为连通性。本文分析了上巴拉那河（巴西）上游河岸植被的连通性要素和控制过程，并估计了由于管理大坝而导致的河道-植被关系的未来变化。研究范围位于波尔图普里马维拉大坝下游30公里处（1999年完工）。通过航空摄影（1：25; 000; 1996）; rgb-cbers卫星图像和先前的野外植物学调查，可以用五个主要的形态植被来绘制地图：树状天然堤坝；灌木状上游洪泛区；灌丛—灌木丛中层洪泛区；禾本科—草皮下层洪泛区和灌丛—草丛洪泛区径流渠道单位。通过使用详细的地形调查和统计工具，在坝前和坝后关闭期，根据形态-植被类型的连通性参数（频率，复发，持久性，季节性，钾肥阶段，石灰岩阶段和fcq指数）对每种形态-植被类型进行了分析。历史系列。数据显示，大坝关闭后，大多数形态植被单元被预测会显示连通性参数值的变化，新的状态可能会影响该参数。以不同的强度河流生态，尤其是河岸植被。本研究中使用的方法可能对其他南美热带河流的大坝影响研究有用。

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