林业科学Issue(10)：59-66,8.DOI:10.11707/j.1001-7488.20141008
皮层和中柱对水曲柳和落叶松吸收根直径变异的影响
Effects of Cortical Thickness and Stele Diameter on Variations of Root Diameter in Fraxinus mandshurica and Larix gmelinii
摘要
Abstract
The diameter of fine roots plays an important role in root physiological and ecological functions of woody plants. Fine root diameter varies greatly within or among tree species,even at the same root branch level. However,the underlying mechanism for such variation remains unclear. Although fine root morphology and anatomy in woody plants have been extensively studied during past decades,it is poorly understood for the mechanism of diameter variation in absorptive roots. In this study,we sampled fine roots from Fraxinus mandshurica and Larix gmelinii plantations,and measured root morphological ( diameter) and anatomical traits ( cortical thickness and stele diameter) ,and used path analysis to examine the effects of anatomical traits on root diameter variation of the two species. There were substantial and similar seasonal variations in root diameter,cortical thickness and stele diameter in both species. Root diameter increased with increasing of cortical thickness and stele diameter. Correlation analysis indicated that 85%-95% of the variations of root diameter could be explained by the variation of cortex thickness,and 92%-97% by variation of stele diameter,suggesting that the anatomical traits were important for root diameter variation in the two species. Path analysis showed that root diameter variation in F. mandshurica was affected directly by cortical thickness,and indirectly by stele diameter,however in L. gmelinii,it was affected directly by stele diameter,and indirectly by cortical thickness. These results may help us understand the mechanism of diameter variation of absorptive roots in woody plants.关键词
根序/根直径/人工林/通径分析/细根Key words
root order/root diameter/plantation/path analysis/fine root分类
农业科技引用本文复制引用
谷加存,赵妍丽,王文娜,王韶仲,王政权..皮层和中柱对水曲柳和落叶松吸收根直径变异的影响[J].林业科学,2014,(10):59-66,8.基金项目
中央高校基本科研业务费专项资金项目(DL12CA06) （DL12CA06）
国家自然科学基金项目(31100470) （31100470）
国家林业科技支撑计划课题(2011BAD37B02－2)。 （2011BAD37B02－2）
