Rainfall redistribution and the spatial heterogeneity of throughfall in Larix gmelinii forest, northeast China

SHI Lei, SHENG Houcai, MAN Xiuling, CAI Tijiu

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2017, Vol. 41 ›› Issue (02) : 90-96.

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南京林业大学学报（自然科学版）
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JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2017, Vol. 41 ›› Issue (02) : 90-96. DOI: 10.3969/j.issn.1000-2006.2017.02.013

Rainfall redistribution and the spatial heterogeneity of throughfall in Larix gmelinii forest, northeast China

  • SHI Lei1,2, SHENG Houcai1*, MAN Xiuling1, CAI Tijiu1
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Abstract

【Objective】 This study was conducted to gain an understanding of the rainfall distribution, spatial variability of throughfall and eco-hydrological processes in Larix gmelinii forest.【Method】 Data for the gross rainfall, throughfall and stemflow corresponding to 19 rainfall events were measured in L. gmelinii forest during the period of a stable canopy(Jul.-Aug. 2013)by long-term locating observation. Throughfall measurments were obtained from 46 rain gauges. The redistribution of rainfall in L. gmelinii forest was summarized and the variability of throughfall under the tree canopy at different sites was compared using correlation analysis. 【Result】 The results indicated that the canopy interception, throughfall and stemflow were 35.14, 148.61 and 0.250 7 mm during the observation period, which accounted for 19.10%, 80.77% and 0.14% of the rainfall in an open field, respectively. The spatial variability of throughfall under the tree canopy was estimated for different rainfall events. It was found that a 3/4 canopy radius resulted in the lowest spatial variability of throughfall and a 4/4 canopy radius, i.e., canopy edge, contributed to the highest throughfall when the meteorological factors(such as rainfall amounts and temperature)were coherent. Given the stable canopy structure, the variance coefficient of throughfall decreases with increasing rainfall depth significantly(P<0.01). 【Conclusion】 Throughfall is the main hydrology component during redistribution of rainfall in L. gmelinii forest(about 81% of rainfall). The 3/4 radius under the tree’s canopy were choosed to layout throughfall collection devices to reduce the field work and to improve scientific research efficiently because of its minimum variation and closest to throughfall ratio(error of about 1%). This may provide the base for the quarlitative analysis of eco-hydrological model of L. gmelinii forest.

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SHI Lei, SHENG Houcai, MAN Xiuling, CAI Tijiu. Rainfall redistribution and the spatial heterogeneity of throughfall in Larix gmelinii forest, northeast China[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY. 2017, 41(02): 90-96 https://doi.org/10.3969/j.issn.1000-2006.2017.02.013

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