Effects of Land Use on Flow Rate Change Indices

Forests

Ali Assani¹  Francis Delisle¹  Raphaëlle Landry¹  Mushombe Muma²  James M. Vose² 

[1] Department of Environmental Sciences, University of Quebec at Trois-Rivières, 3351 Boulevard des Forges, Trois-Rivières QC G9A 5H7, Canada;

关键词: flow rate change;    coefficient of variation;    coefficient of immoderation;    temperature;    precipitation;    agriculture;   

DOI  :  10.3390/f6114349

来源: mdpi

【 摘 要 】

The goal of this study was to analyze the impact of agriculture on the spatial and temporal variability of flow rate change indices from 1930 to 2008. The two indices used are the coefficient of immoderation (CI) and the coefficient of variation (CV). Values of these two indices are higher for the L’Assomption River agricultural watershed than for the Matawin River forested watershed due to higher runoff in the former than in the latter. The difference in these values between the two watersheds is greater for winter, but it is lower for summer, when the difference in runoff between the two watersheds is strongly attenuated by the presence of crops. Regarding the temporal variability, a difference between the two watersheds is observed in the fall. For the agricultural watershed, mean values of neither index show a break in slope, while a break is observed for the forested watershed. In both watersheds, both indices are positively correlated with maximum temperature and total rainfall in winter, but only to this latter climate variable in the fall. In springtime, the two indices are negatively correlated with minimum temperature in the forested watershed, but only CV is correlated, positively, with this same climate variable in the agricultural watershed.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.