Effect of canopy interception on spatial variability and isotopic composition of throughfall in Japanese cypress plantations

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• 作者：Hiroaki Kato ; Yuichi Onda ; Kazuki Nanko ; Takashi Gomi ; Tsutomu Yamanaka ; Shimpei Kawaguchi
• 关键词：Throughfall ; Forest canopy ; Rainfall redistribution ; Isotopic analysis ; Japanese cypress forest
• 刊名：Journal of Hydrology
• 出版年：11 November, 2013
• 年：2013
• 卷：504
• 期：Complete
• 页码：1-11
• 全文大小：1731 K

文摘

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Summary

We conducted a field monitoring experiment examining throughfall in Japanese cypress plantations located in Tochigi Prefecture, eastern Japan. A set of 20 tipping-bucket rain gauges and throughfall collectors were placed in a lattice-like distribution throughout a 10 脳聽 10-m experimental plot to investigate the effect of the forest canopy on the spatial variability of throughfall. The isotopic composition of throughfall and open rainfall were analyzed and compared for each rainfall event. A clear relationship between throughfall rate and the radial distance to the nearest tree trunk was observed when the influence of wind was negligible; however, such a systematic pattern of throughfall was not observed during rainfall events that occurred during windy conditions. The 未¹⁸O and 未D values in throughfall varied considerably, reflecting different rainwater flow paths in the saturated canopy. The analysis of stable isotope ratios in the throughfall and its comparison with isotopic composition of rainwater hitting the canopy can help elucidate the interception processes in the forest canopy.