A study on soil preferential flow under three vegetations in the upper reach of Minjiang River by brilliant blue dye tracer
CHEN Feng-qin1, SHI Hui2
1. Academy of Water Conservancy Research of Shandong Province, Ji'nan 250013; 2. College of Environment and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
Preferential flow is common phenomena in soil,and has significant influence to soil water movement.The soil preferential flow under three typical vegetations was researched by using brilliant blue dye tracer method in field,in order to research the forest conserving water resources deeply.The results showed that the preferential flow exist in all soils under three typical vegetation in upper reach of Minjiang River,and the complex degrees of preferential flow is different for each soil due the deference of vegetations,elevations,soil formation processes,action of roots and soil animals.The dye area ratios reflected the distribution of infiltrated water in soil profiles,although most infiltrated water rested within 10 cm nearly soil surface,some water reached the bottom of profiles through the preferential flow channels.The fractals of preferential flow dye profiles were 1.59 to 1.85,and it reflected the complexity of preferential flow channels,the soils under the virgin coniferous fir forest and sub-alpine meadow had high fractals with complex preferential flow channels.The preferential flow brings key influences for knowing hydraulic processes in slope,and is a basis for understanding the hydraulic effects of forest.
陈风琴1, 石辉2*. 岷江上游三种典型植被下土壤优势流现象的染色法研究[J]. , 2006, 25(1): 69-73.
CHEN Feng-qin1, SHI Hui2. A study on soil preferential flow under three vegetations in the upper reach of Minjiang River by brilliant blue dye tracer. , 2006, 25(1): 69-73.
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