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《JOURNAL OF BEIJING FORESTRY UNIVERSITY》 2000-04
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A study on the canopy structure and light distribution of \%Larix principis ruppurechtii\% during the growing season

Ma Qinyan; Liu Zhigang; Pan Xiangli; Han Hairong; Zhang Rong. Journal of Beijing Forestry University ?(2000)22(4)18~21 [Ch,5 ref.]College of Resources and Environment,Beijing For.Univ.,100083,P.R.China.  
Based on data of photosynthetic available radiation (PAR) measured in two stands for 29 days during the growing seasons, and data of 32 sample trees measured by the clip method, the light distribution and canopy structure during the growing season were studied for \%Larix principis rupprechtii\% plantation stands in North China. The inclination angles of primary branches increase with their ages and decrease with their base heights. The most of the leaf area index of stands distributed in the layer located in 2.5~4.5 m of the canopy for the high density stand (3?227trees hm -2 ) and that located in 3.5~5.5 m for the low density stand (2?000trees hm -2 ), from top of the canopy downwards. The cumulative distribution curves of the leaf area index and the total surface area index both were S-shaped, the total surface included the leaf area and the surface area of branches and stems. In high density stand, the daily mean transmissivity ranged from 1.69?% to 5.18?% PAR, reflectivity within 3.72?%~6.21?% and absorptivity within 89?%~95?%, and in the low density stand, those were within 2.38?%~6.34?%, 5.18?%~7.01?% and 88?%~93?% respectively. In the growing season, the values of transmissivity and reflectivity both were July August June September, and the values of absorptivity were SeptemberJuneAugust July.
【Fund】: 国家自然科学基金资助项目! ( 3 8970 5 97)
【CateGory Index】: S791
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