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中文摘要：
研究了柑桔林下穿透雨的分布特征，结果表明：在测定期间，穿透雨量占总降雨量的68．3％，5月的穿透雨量最大（245．1mm），而穿透雨率最大值（73．3％）出现在8月。穿透雨量与降雨量具有显著相关性（p〈0．01），而穿透雨率与降雨量和降雨强度的相关性均达到显著水平（p〈0．05）。柑桔林下穿透雨显示出明显的空间变化，各观测点间穿透雨率具有显著性的差异，而且穿透雨的空间异质性（穿透雨率的变异系数Cv）随着降雨量或降雨强度的增加而降低，聚类分析也显示出穿透雨在不同观测点间具有差异性。柑桔林下穿透雨呈现明显的聚集效应。
英文摘要：
To investigate the characteristics of throughfall in citrus orchard in this study. Results show that：throughfall percentage of gross rainfall accounts for 68.3 % during the whole measurement period. The maximal volume of throughfall （245.1 nun） occurred in May and the maximal throughfall percentage （73.3 % ） occurres in August. There is significantly positive correlation between throughfall and rainfall depth （p 〈 0.01 ）, as well as the correlation between throughfall percentage and rainfall depth or rainfall intensity （ p 〈 0.05）. The significant spatial variation in throughfall is observed below the canopy of citrus orchard. Moreover, the spatial heterogeneity of throughfall among different sampling sites varies significantly （p 〈 0.05） and the Cv of throughfall percentage decreases with the increase of rainfall depth or rainfall intensity. The cluster throughfall percentage among all sampling sites differs significantly （p 〈 0.05）, and the throughfall below the evident rainfall concentration in citrus orchard.
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