重庆缙云山毛竹林次降雨再分配特征及穿透雨的空间异质性
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裴承敏(1994-),女,硕士研究生,主要从事森林水文研究。E-mail:1606849846@qq.com

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林业科学技术研究项目"三峡库区典型防护林林分结构与功能调控技术"(2017-02);青年教师科学研究中长期项目"流域水文过程与机理"(2016ZCQ06)


Rainfall Redistribution and Spatial Variability of Throughfall of a Phyllostachys Edulis Stand in the Jinyun Mountain National Nature Reserve at Chongqing
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    摘要:

    为分析毛竹林的林冠降雨再分配规律及其穿透雨的空间分布特征和影响因素,在重庆缙云山自然保护区内选择的30 m×30 m毛竹林标准地内,随机布置72个穿透雨监测点,并选取6株标准木观测干流,于2017年5-8月监测毛竹林水文特征。结果表明:18场典型降雨的合计林冠截留量、穿透雨量和树干茎流量分别为32.74,208.09,10.97 mm,分别占总降雨量的13.00%,82.64%,4.36%;次穿透雨率随次降雨量增加呈对数函数增长;穿透雨的空间变异系数(CVS)随次降雨量和降雨强度增加呈幂函数递减;当次降雨量小于10 mm时,叶面积指数(LAI)与穿透雨率呈显著负相关(p<0.05);各监测点不同降雨场次中穿透雨率变异系数(CVT)为19.2%~47.7%,其空间分布格局与毛竹密度的空间分布较为一致,而与观监测点上方的LAI无显著相关;穿透雨量较大的监测点趋向于分布在毛竹冠区边缘。

    Abstract:

    In order to analyze the rainfall redistribution in forest canopy and the spatial variation of the throughfall in phyllostachys edulis stands, a total of 72 gauges were randomly set up within a 30 m×30 m sample plot of a phyllostachys edulis stand, which was located in the Jinyun Mountain National Nature Reserve at Chongqing, and 6 standard trees were selected to observe the stem flow. Altogether 18 rainfall events were monitored from May to August, 2017. The results showed that the total volume of interception, throughfall and stem flow of all the rainfall events was 32.76, 208.1 and 10.97 mm respectively, accounting for 13.00%, 82.64% and 4.36% of the total rainfall, respectively. A logarithmically increasing function was fitted between throughfall ratio and rainfall depth. The coefficients of spatial variability of throughfall showed a power function relationship with both rainfall volumes and rainfall intensities. The impacts of leaf area index (LAI) on throughfall ratio decreased with the rising rainfall depth. A significantly negative correlation was found between the throughfall ratio and LAI when rainfall was less than 10 mm. The coefficients of variance of throughfall among all the 18 rainfall events (CVT) at different gauges changed from 19.2% to 47.7%. The spatial distribution pattern of CVT was in accordance with the spatial distribution pattern of phyllostachys edulis densities, but showed no significant relationship with the distribution of LAI. The monitoring points with larger throughfall tended to be located at the edge of Pyllostachys edulis canopy.

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裴承敏, 王云琦, 张守红, 王玉杰.重庆缙云山毛竹林次降雨再分配特征及穿透雨的空间异质性[J].水土保持学报,2018,32(5):202~207

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  • 收稿日期:2018-04-17
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  • 在线发布日期: 2018-10-16
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