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Difference and inherent linkage of root characteristics in different root classification of Pinus tabulaeformis seedlings
Authors
刘国彬
刘莹
+3 more
曲秋玲
王国梁
袁子成
Publication date
1 January 2010
Publisher
Abstract
植物根序和径级不仅反映细根的形态结构,而且能反映根系的一些生理特征,如细根寿命和周转等。该文以二年生油松(Pinus tabulaeformis)幼苗根系为研究对象,系统比较了根序分类方法和径级分类方法在描述根系特征上的优缺点,探索了两者之间的内在联系。结果表明:二年生油松幼苗最多可包括6级根序,直径的变化范围为0.169–3.877mm。按根序划分,I–VI级根序的总根长和总根表面积主要集中在前3级根序,这3级根序的根占总根长的78.77%和总根表面积的62.72%。前3级根序的比根长是后3级根序比根长的1.3–3.0倍,比根面积是后3级比根面积的1.0–1.5倍。按常用的径级(以0.5、1.0、1.5和2.0mm为阈值)划分方法,油松幼苗大部分根系直径≤1.5mm,此区间细根的根长和根表面积占总根长的93.76%和总根表面积的84.35%。直径≤1.5mm的细根平均比根长是>1.5mm细根比根长的3–7倍,比根面积的1.5–3.0倍。由于油松根序和径级之间有显著的指数关系,依据径级最大程度反映根序的原则,提出了新的径级划分方法,即以0.4、0.8、1.3和2.0mm为阈值对油松幼苗根系径级重新进行划分。此..
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Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources
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oai:ir.iswc.ac.cn/:361005/4183
Last time updated on 21/09/2018