Over the past 40 years, the discharge in South America’s Paraná River basin has increased despite no evidence of significant rainfall increases in the basin. In this analysis, we show that the observed multi-decadal increase in discharge can be explained by concomitant changes in land cover that have occurred within the basin during this period. Our analysis also indicates that the peak discharge timing may have shifted concurrently from January/February in the 1970s to March in more recent decades. While land-use effect dominantly alters the long-term temporal dynamics of the river discharge over multi-decades, the change in the seasonality of the discharge can be attributable to the combined effect of the land-use and climate variability. This study suggests that the mean annual discharge is likely to change in the other South American River basins where land transformation is currently taking place, and the shift of the month of peak discharge needs to be taken into consideration to forecast the hydropower generation under changing climate and land conversion.

中文翻译：

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土地覆盖的变化解释了巴拉那河的流量不断增加。

在过去的40年中，南美南美巴拉那河流域的排放量增加了，尽管没有证据表明流域的降雨显着增加。在此分析中，我们表明，观测到的排水量的数十年增加可以用这一时期流域内发生的土地覆被变化来解释。我们的分析还表明，峰值放电时间可能从1970年代的1月/ 2月同时转移到了最近几十年的3月。尽管土地利用效应主要改变了数十年来河流排放的长期时间动态，但排放季节的变化可归因于土地利用和气候多变性的综合影响。