In forest ecosystems, measurement of bark water storage capacity (BWSC) is required for determining the amount of rainfall interception and understanding throughfall and stemflow processes. We compared the bark roughness coefficient (BRC) and BWSC of even-aged, widely-planted, broad-leaved and needle-leaved species in the Chitgar Forest Park, near Tehran, Iran. Bark samples (n = 10 per species) were extracted from three needle-leaved species (Cupressus arizonica, Thuja orientalis, and Pinus eldarica) and two broad-leaved species (Acer velutinum and Robinia pseudoacacia). The highest and lowest BWSC was found to be for A. velutinum and P. eldarica trees, respectively (0.63 vs. 0.32 g cm⁻³). Among the studied species, R. pseudoacacia had the highest BRC (0.69), and the lowest was found to be for A. velutinum species (0.03). The whole tree bole BWSC ranged from 156.8 L for P. eldarica to 14.6 L for A. velutinum. The results suggested that A. velutinum may provide more stemflow to the forest floor due to its small size, low BRC and subsequent low whole tree bole BWSC. These findings significantly contribute to our understanding of rainfall partitioning dynamics and ecohydrological processes associated with stemflow from trees. This improved understanding will help managers in selecting tree hydrologic characteristics that align with their objectives in forestry treatments, afforestation plans and establishment of vegetation in urban park settings within drylands.

在森林生态系统中，需要测量树皮储水能力（BWSC）来确定降雨拦截量并了解径流和茎流过程。我们比较了伊朗德黑兰附近奇特加尔森林公园的同龄、广泛种植的阔叶树和针叶树种的树皮粗糙度系数 (BRC) 和 BWSC。树皮样本（每个物种 n = 10）是从三种针叶树种（Cupressus arizonica、Thuja orientalis和Pinus eldarica）和两种阔叶树种（Acer velutinum和Robinia pseudoacacia）中提取的。发现最高和最低的 BWSC 分别是A. velutinum和P. eldarica树（0.63 vs. 0.32 g cm ^-3）。在所研究的物种中，R.pseudoacacia的 BRC 最高（0.69），最低的是A.velutinum物种（0.03）。整个树干 BWSC 范围从P. eldarica的156.8 L 到A. velutinum的 14.6 L。结果表明，由于A. velutinum尺寸小、BRC 低以及随后的整树树干 BWSC 低，因此它可以为森林地面提供更多的茎流。这些发现极大地有助于我们了解与树木茎流相关的降雨分配动态和生态水文过程。这种加深的了解将有助于管理者选择与其林业处理、造林计划和旱地城市公园环境中植被建立目标相一致的树木水文特征。