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Root distribution in the different forest types and their relationship to soil properties
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- Author:
- No author available
- Journal Title:
- Acta Ecologica Sinica
- Issue:
- 19
- DOI:
- 10.5846/stxb201108281254
- Key Word:
- 根系分布;根长密度;分维数;容重;有机碳;全氮
Abstract： 在红壤丘陵区选取8种典型森林类型,对不同土层深度、不同径级的根长密度分布特征、根长分维数,以及根系特征与土壤容重、有机碳、全氮的关系进行了研究.结果表明:马尾松低效林根长密度最小,杉木低效林和湿地松林较大,表层土壤根长密度与灌草覆盖度显著相关(r=0.793,P＜0.05).各种森林类型的根长密度随着土壤深度的增加均表现为递减规律,但随深度的增加,不同森林类型的差异逐步缩小,且植物种类及生长状况对根长密度分布的影响越来越小.在相同的土层中,根长密度随径级的变化并不一致,马尾松低效林0＜L≤0.2mm径级根长密度最大,其他类型各土层均表现为0.2＜L≤0.5mm径级根长密度最大的偏峰曲线特征.各径级根长密度随土层加深也表现为递减趋势,根系径级越大,表层与底层的根长密度差异越明显.根长密度与容重呈显著负相关,与有机碳、全氮呈极显著正相关,说明根长密度越大,既有利于改良土壤结构性状,也有利于丰富土壤有机碳和全氮含量；从不同径级来看,径级1-2mm根系对改良土壤结构和增加土壤有机碳、全氮含量作用最为显著,径级≤1.0mm的根系对土壤性状改良作用不明显.各森林类型的根长分维数在2.0973-2.6063之间,分维数越大,根系长度更集中分布于0-0.2mm径级内,根长分维数反映了不同径级范围根系长度的组成状况.
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