皮层和中柱对水曲柳和落叶松吸收根直径变异的影响

doi:10.11707/j.1001-7488.20141008

Abstract

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.

Key words: root order, root diameter, plantation, path analysis, fine root

CLC Number:

S718.41

Gu Jiacun, Zhao Yanli, Wang Wenna, Wang Shaozhong, Wang Zhengquan. Effects of Cortical Thickness and Stele Diameter on Variations of Root Diameter in Fraxinus mandshurica and Larix gmelinii[J]. Scientia Silvae Sinicae, 2014, 50(10): 59-66.

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Effects of Cortical Thickness and Stele Diameter on Variations of Root Diameter in Fraxinus mandshurica and Larix gmelinii

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