Coarse root spatial distribution determined using a ground-penetrating radar technique in a subtropical evergreen broad-leaved forest,China

作     者：YAN Hui DONG XinLiang FENG Gang ZHANG ShouRen MUCCIARDI Anthony 

作者机构：State Key Laboratory of Vegetation and Environmental ChangeInstitute of Botany Chinese Academy of Sciences University of Chinese Academy of Sciences Inner Mongolia Forestry Monitoring and Planning Academy TreeRadarInc. Silver Spring MD 20910 USA 

出 版 物：《Science China(Life Sciences)》 (中国科学（生命科学英文版）)

年 卷 期：2013年第56卷第11期

页      面：1038-1046页

核心收录：

学科分类：0710[理学-生物学] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 09[农学] 0903[农学-农业资源与环境] 

基　　金：supported by the National Natural Science Foundation of China(31170457 30710103907) 

主　　题：abiotic factors biotic factors coarse root density ground-penetrating radar (GPR) spatial distribution 

摘      要：Coarse roots play a critical role in forest ecosystems and both abiotic and biotic factors affect their spatial *** some extent,coarse root density may reflect the quantity of root biomass and biotic competition in ***,using traditional methods(e.g.,excavation)to study coarse roots is challenging,because those methods are time-consuming and ***,these destructive methods cannot be repeated in the same ***,the discovery of non-destructive methods for root studies will be very *** this study,we used a ground-penetrating radar technique to detect the coarse root density of three habitats(ridge,slope and valley)and the dominant tree species(Castanopsis eyrei and Schima superba)in a subtropical *** found that(i)the mean of coarse root density for these three habitats was 88.04roots m–2,with roots being mainly distributed at depths of 0–40 *** root densities were lower in deeper soils and in areas far from the trunk.(ii)Coarse root densities differed significantly among the three habitats studied here with slope habitat having the lowest coarse root *** with ***,*** had more roots distributed in deeper ***,coarse roots with a diameter3 cm occurred more frequently in the valleys,compared with root densities in ridge and slope habitats,and most coarse roots occurred at soil depths of 20–40 cm.(iii)The coarse root density correlated negatively with tree species richness at soil depths of 40–60 *** abundances of the dominant species,such as ***,Cyclobalanopsis glauca,Pinus massoniana,had significant impacts on coarse root density.(iv)The soil depth of 0–40 cm was thebasic distribution layerfor coarse roots since the majority of coarse roots were found in this soil layer with an average root density of 84.18 roots m–2,which had no significant linear relationships with topography,tree species richness,rarefied tree species richness and tree ***