Variation characteristics of throughfall in citrus orchard

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 mm) occurred in May and the maximal throughfall percentage(73.3%) occurres in August.There is significantly positive correlation between throughfall and rainfall depth(p0.01),as well as the correlation between throughfall percentage and rainfall depth or rainfall intensity(p0.05).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(p0.05) and the CV of throughfall percentage decreases with the increase of rainfall depth or rainfall intensity.The cluster analysis shows throughfall percentage among all sampling sites differs significantly(p0.05),and the throughfall below the canopy has the evident rainfall concentration in citrus orchard.