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Advances in Earth Science  2009, Vol. 24 Issue (7): 825-833    DOI: 10.11867/j.issn.1001-8166.2009.07.0825
A Study of Interception of Picea Crassifolia Based on Different Canopy Closure
Tan Junlei1,2,Ma Mingguo1,Che Tao1,Bai Yunjie1,2
1.Cold and Arid Regions Environmental and Engineering Research Institute,  Chinese Academy of Sciences, Lanzhou  730000, China;
2.Graduate University of Chinese Academy of Sciences, Beijing  100049, China
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Qilian Mountain is the main region of water conservation of many inland river basins, such as Shiyang River Basin, Heihe River Basin and Shule River Basin. As the main constructive species, Picea Crassifolia plays an important role in hydrological processes especially in a watershed scale. Therefore, it is meaningful to make a study of the redistribution of precipitation of Picea Crassifolia, especially the interception. Many scholars had studied the canopy interception characteristics. In most of these studies, however, rain gauges were installed in study plot accordingly by random or regular method. Thoese two methods do not take into account the canopy structure, which will not be easy to bring about representative result. The effect of canopy closure on top of rain gauges was not taken into account in both of these two methods. In this paper, a new method was developed: the rain gauges were installed according to canopy closure and the closure above each gauge is well-proportioned. Synchronously, rain troughs were installed in experiment plot according to the regular method, which would be used for a contrast. In order to estimate canopy closure, an ordinary digital camera was employed. The photographs from the digital camera were processed base on the ENVI (software of image processing). Five conclusions could be obtained based on the analysis of 34 groups of data collected during the observation. Firstly, the relationship between throughfall in plot and canopy closure is non-linear. Secondly, mean throughfall in plot increased with precipitation, and they had a strong linear relationship. Thirdly, within certain precipitation range, canopy interception increased with precipitation, otherwise, it decreased. Fourthly, the percentage of interception of Picea Crassifolia in total precipitation is 22.2%. Finally, the method that rain gauges are installed according to canopy closure is viable.

Key words:  Picea Crassifolia      Canopy closure      Throughfall      Canopy interception.     
Received:  28 April 2009      Published:  10 July 2009
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TAN Dun-Lei
MA Meng-Guo
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Tan Junlei,Ma Mingguo,Che Tao,Bai Yunjie. A Study of Interception of Picea Crassifolia Based on Different Canopy Closure. Advances in Earth Science, 2009, 24(7): 825-833.

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