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| Dynamics and vertical distribution patterns of fine root weights of different aged Leucaena leucocephala stand in debris flow source area |
| Guo Linghui1,2,3,Wang Daojie1,2,Zhang Yunhong1,4,Jiao Zhen1,2,3,Chen Dong1,2,3 |
| 1.Key Laboratory of Mountain Hazards and Earth Surface Processes,Chinese Academy of Sciences,610041,Chengdu;2.Chengdu Institute of Mountain Hazards and Environment,Ministry of Water Resources,Chinese Academy of Sciences,610041,Chengdu;3.Graduate University of Chinese Academy of Sciences,100049,Beijing;4.College of Population Resources and Environment,Shandong Normal University,250014,Jinan:China |
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Abstract In this study,Dynamics and vertical distribution patterns of fine root weights of different aged Leucaena leucocephala were investigated by mean of dig method from up to down at the distance 1.0m from the stem,in Dongchuan Debris Flow Observation and Research Station,Chinese Academy of Sciences.The results indicated that the weights of fine roots of tree were not solely increasing with the increasing tree age,but decreased at first and then increased in the similarly ranged profile.The maximum weight densities of fine roots for different aged tree were completely located at 0-20cm soil layer,also the root appeared an obvious accumulation trait in the topsoil layer.However,its centralized feature weakened as the time went by,showing a deep-seated and uniform grow trend. In addition,there were apparent correlations between soil depths and fine root weight densities,which decreased at an exponent function with increases of soil depths.Compared with the less important particles(2mm<D≤5mm),the fine roots(D≤2mm) determined the entire trends of the dynamics and vertical distributions of fine root weights,which will be the important basis of debris flow control with biological measures.
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Received: 19 November 2009
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