Fine Root Distribution Pattern of Different Aged Leucaena leucocephala Trees in Debris Flow Source Area in Jiangjia Gully, China  

作　　者：GUO Ling-hui WANG Dao-jie SUN Xiang-min CHEN Dong CHEN Xiao-yan 

机构地区：[1]Key Laboratory of Mountain Hazards and Earth Surface Processes, Chinese Academy of Sciences [2]Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences [3]University of Chinese Academy of Sciences [4]Institute of Mountain Hazards and Environment, Chinese Academy of Sciences

出　　处：《Journal of Mountain Science》2014年第4期941-949,共9页山地科学学报（英文）

基　　金：supported by the National Science and Technology Support Projects (Grant No. 2012BAC06B02);National Basic Research Program of China (973 Program, Grant No. 2011CB409903);The National Natural Science Foundation of China (Grant No. 40771025)

摘　　要：Fine root is critical to restrain soil erosion and its distribution pattern is of great influence on the restraining effects. This study studied the fine root biomass （Br） distribution of different aged Leucaena leucocephala （5, 10, 15 years） in debris flow source area in Jiangjia Gully by digging downward to the bottom at different distances to stem in three directions on slope. The results showed the Br increased dramatically by 143% from 5 years to lO years and then rose slowly by 38% from to years to 15 years. The Br of 5 years was significantly asymmetric between uphill and alonghill directions, but there was little difference among directions for other ages, and a concentration trend appeared to exist in downhill and alonghill directions. Moreover, fine root （D≤1 mm） was significantly heavier than that of fine root （1mm〈D〈2 ram）, playing a leading role in the vertical distribution of the whole fine root, with a logarithmic or an exponential function. The results presented may shed light on fine root distribution pattern and evaluation of its effect on slope stability in debris flow source area.

关 键 词：Leucaena leucocephala Jiangjia Gully Debris flow Root distribution 

分 类 号：S792.99[农业科学—林木遗传育种] Q948.15[农业科学—林学]