Throughfall (TF) makes up the majority of understory rainfall and thereby plays an important role in controlling the amount of water reaching the forest floor. TF under a single Quercus castaneifolia (C.A.Mey, chestnut-leaved oak) tree in Northern Iran was measured during the leafed and leafless periods. TF quantity under the Q. castaneifolia canopy made up 69.3% and 88.0% of gross rainfall during leafed and leafless periods, respectively. Phenoseason influenced TF distribution patterns as TF temporal patterns during the leafed period were slightly more stable than during the leafless periods. The minimum number of TF collectors needed to yield a representative mean TF with accepted errors of 10% at 95% confidence level was twenty-six and twelve TF collectors for leafed and leafless periods, respectively. We conclude that phenoseasonality significantly affects TF spatiotemporal variability and presented the required number of collectors necessary for sampling TF under an individual Q. castaneifolia tree.

中文翻译：

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在单栎栎CAMey的作用下，叶片物候学驱动穿透的时空格局。

穿透力（TF）构成了地下大部分降雨，因此在控制到达森林地面的水量方面起着重要作用。在有叶和无叶时期，对伊朗北部的一棵栎栎（CAMey，栗叶橡树）树下的TF进行了测量。Q下的TF数量。castaneifolia篷期间叶和无叶的周期分别由69.3％和总降雨量的88.0％。现象季节影响了TF分布模式，因为在叶子期的TF时间模式比在没有叶子期的TF模式更稳定。最小TF数以产生一个代表平均需要收集器TF与在95％置信水平的10％接受错误是26和12 TF为叶和无叶的周期收集器，分别。我们得出的结论是，现象表现显着影响TF时空变异性，并提出了在单个Q. castaneifolia树下采样TF所需的所需收集器数量。