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首页> 外文期刊>Journal of forest research >A comparison of root distribution of three hardwood species grown on a hillside in the Caspian forest, Iran
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A comparison of root distribution of three hardwood species grown on a hillside in the Caspian forest, Iran

机译：伊朗里海森林山坡上三种硬木树种根系分布的比较

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摘要

Slope is a complex environmental factor that can subject plants to a number of mechanical stresses. The anchorage of roots and improvement of slope stability mainly depend on specific properties of root systems, such as root distribution. In the present study, 24 trees (from three species) growing on gentle slopes (10-20p) were randomly chosen for root distribution analysis. The profile trenching method was used to obtain root characteristics. The findings indicated that root area ratio (RAR) decreased with depth and that maximum RAR values were observed in the upper layers; RAR values were between 0.0004% and 6.6444%. Average RAR values were not statistically different in upslope and downslope layers except in one case. The dot grid method (100 c 150 mm) usually overestimated the RAR values. The amount of roots decreased with depth following a power law. About 50% and 90% of roots were located in the first 30 and 60 cm depths, respectively. Results of analysis of covariance (ANCOVA) showed a significant effect of diameter at breast height (DBH) on total RAR but not on the total number of roots. About 70% of roots had diameter of less than 10 mm. Spearman's correlation showed significant negative correlation between the total number of roots and the amount of N, P, and K elements, and a positive correlation between DBH and RAR. The results serve to develop understanding of the biotechnical characteristics of root systems of Caspian species.
机译：坡度是一个复杂的环境因素，可能会使植物遭受许多机械压力。根部的锚固和边坡稳定性的改善主要取决于根系的特定属性，例如根系分布。在本研究中，随机选择了在缓坡（10-20p）上生长的24棵树木（来自三种树种）进行根分布分析。使用轮廓开槽方法获得根部特征。结果表明，根部面积比（RAR）随深度而降低，并且在上层中观察到最大RAR值。 RAR值在0.0004％至6.6444％之间。除一种情况外，上坡和下坡层的平均RAR值无统计学差异。点网格法（100 c 150 mm）通常会高估RAR值。根的数量随幂律而随深度减小。大约50％和90％的根分别位于前30厘米和60厘米深度。协方差分析（ANCOVA）的结果显示，胸高（DBH）直径对总RAR有显着影响，但对根总数没有显着影响。大约70％的根的直径小于10毫米。 Spearman的相关性显示根的总数与N，P和K元素的数量之间显着负相关，而DBH和RAR之间则具有正相关。结果有助于加深对里海物种根系生物技术特性的了解。

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