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1. 贵州大学林学院,贵州,贵阳,550025
2. 中国科学院环江喀斯特生态系统观测研究站, 广西 环江,547100
3. 中国科学院亚热带农业生态研究所,长沙,410125
Published:2024
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GONG Liansha, YANG Jing, DAI Quanhou, et al. Effects of Vegetation Exclusion on Rainfall Redistribution Characteristics of Shrubs Under Different Rainfall Types[J]. 2024, 38(5): 315-322.
GONG Liansha, YANG Jing, DAI Quanhou, et al. Effects of Vegetation Exclusion on Rainfall Redistribution Characteristics of Shrubs Under Different Rainfall Types[J]. 2024, 38(5): 315-322. DOI: 10.13870/j.cnki.stbcxb.2024.05.019.
[目的] 为探究不同季节及降雨类型下
林分冠层结构发生改变对降雨分配特征的影响。[方法] 以喀斯特区典型灌木林为研究对象
选取3个10 m×10 m的样地
分别进行30%(TC30)和10%(TC10)的植被剔除
并以不剔除(TC0)作为对照
分别于旱雨季对剔除处理后各样地的穿透雨、树干径流等进行监测。[结果] 旱雨季不同降雨类型下
各样地穿透雨率为72.3%~96.6%
不同剔除比例下样地间穿透雨率总体上无明显差异。无论在旱季或雨季
树干径流率在各降雨类型下均表现为TC0(5.6%~13.9%)>TC10(4.8%~8.1%)>TC30(2.1%~6.1%)
其中旱季中雨、雨季大雨和雨季暴雨下差异显著(p<0.05)。相较TC0和TC10
TC30样地的降雨输入量(穿透雨+树干径流)在旱季或雨季均为最高(分别为98.9%和94.8%)。[结论] 综上可知
剔除植被对穿透雨率影响不明显
但可显著降低树干径流率
且适当疏林可提高降雨输入量
增加土壤和植被可用水量
提高降雨-土壤水转化效率
研究结果可为喀斯特区提高降水资源利用效率提供参考。
[Objective] In order to explore the effects of canopy structure changes on rainfall distribution characteristics under different seasons and rainfall types. [Methods] Taking karst typical shrub forest as the research object
three 10 m×10 m plots were selected to remove 30% (TC30) and 10% (TC10) vegetation
respectively
and no exclusion (TC0) was used as the control to monitor the throughfall and stemflow of each sample plot after removal in the dry and rainy seasons. [Results] The throughfall rate of each sample plot was 72.3%~96.6% under different rainfall types in the dry and rainy season
and there was no significant difference in the throughfall rate of each sample plot under different rainfall types or exclusion ratios. However
the stemflow rate was TC0 (5.6%~13.9%)> TC10 (4.8%~8.1%)> TC30 (2.1%~6.1%) in both dry and rainy seasons
and there were significant differences under moderate rainfall in dry season
heavy rain in rainy season and heavy rain in rainy season (p<0.05). In addition
compared with TC0 and TC10
TC30 had the highest rainfall input (throughfall + stemflow) in both the dry and rainy seasons (98.9% and 94.8%
respectively). [Conclusion] The removal of vegetation has no obvious effect on the throughfall rate
but can significantly reduce the stemflow rate
and appropriate forest thinning can increase rainfall input
increase soil and vegetation water availability
and improve the rainfall-soil water conversion efficiency
which can provide a reference for improving the rainfall resource use efficiency in karst areas.
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