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《ACTA AGRICULTURAE UNIVERSITATIS HENANENSIS》 1994-03
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Study on the Shading Mathematic Model of Tree Crown

Li Shuren Zhao Yong(Dept.Forestry of Henan Agri. Uni.,Zhengzhou 450002)  
According to ecological field theory and method,it was proposed that the shad-ing projections of single broadleaf three crown were composed of a parahol and a circle andthose of coniferous trees were composed of a combination of triangle and a semicircle. Thedaity projection course of tree crown fromed“C”and the shape was like an oval,The shad-ing projeetion of line trees was in strip form.The daily effective affecting width of east-west banded trees in the middle latitute area was 1.5 times the tree height with the forestprojection centraliyed,and the southnorth ones 4 time with the forest projection decen-traliyed. In forest,the shading shape of the shaded tree to its neighbor was also anoval,thescope shaded was positively in proportion to the volume of its neighbor and inversly in pro-portion to the distance from its neighbor to the shaded tree.
【CateGory Index】: S718.45
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