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兴安落叶松林降雨再分配及其穿透雨的空间异质性(PDF/HTML)

《南京林业大学学报(自然科学版)》[ISSN:1000-2006/CN:32-1161/S]

Issue:
2017年02期
Page:
90-96
Column:
研究论文
publishdate:
2017-03-23

Article Info:/Info

Title:
Rainfall redistribution and the spatial heterogeneity of throughfall in Larix gmelinii forest, northeast China
Article ID:
1000-2006(2017)02-0090-07
Author(s):
SHI Lei12 SHENG Houcai1* MAN Xiuling1 CAI Tijiu1
1. College of Forestry, Northeast Forestry University, Harbin 150040, China;
2.Daqing Planning and Architectural Design Institute, Daqing 163000, China
Keywords:
Larix gmelinii forest canopy interception stemflow throughfall spatial heterogeneity
Classification number :
S715
DOI:
10.3969/j.issn.1000-2006.2017.02.013
Document Code:
A
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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Last Update: 2017-03-23