Study on Canopy Interception of F raxinus m andshu rica
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1.
Research Institute of Forestry, CAF
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2.
Key Laboratory of Tree Breeding and Cultivation, State Forestry Administration,Beijing 100091,China
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3.
Foreign Cap ital Project Office of Liaoning Provincial Forestry Department, Shenyang 110036, Liaoning,China
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Received Date:
2007-07-09
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Abstract
The relationship s between canopy intercep tion of Frax inus m andshurica Rup r. and rainfall were studiedfrom May to Sep tember in 2003 by surveying and statistic methods. The result showed that the canopy intercep tion ofFraxinus m andshu rica for rainfallwas 68. 77 mm, which accounted for 17. 41% of total rainfall in the same periods.The rainfall was redistributed by the p roportion of penetration 72. 50%, intercep tion 17. 41% and the stem flow10. 08%; the redistribution of rainfall by canopy could be simulated p recisely by the imp roved Horton model , thecanopy rainfall adsorp tion capacity of Fraxinus m andshurica was 0. 84 mm. The parameter which means coefficientof evaporation of canopy regionally was 0. 118 3. It was indicated that the curve of forest intercep tion with rainfallmarked 3 phase such as descent quickly phase ( intercep tion rate more than 19% while rainfall less than 10 mm) ,descent gradually phase ( intercep tion rate is in 19. 0% —12. 8% while rainfall 10—30 mm ) and stable phase( intercep tion rate less than 12. 8% while rainfall more than 30 mm) , which could exp lain the relationship s ofintercep tion with canopy geometry shape characteristics of Fraxinus m andshurica. The stable intercep tion rate was12. 8%.
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