Variation characteristics of throughfall in citrus orchard

To investigate the characteristics of throughfall in citrus orchard in this study. Results show that:throughfal 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(p<0.01),as wel as the correlation between throughfall percentage and rain fall 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 throughfal among different sampling sites varies significantly(p<0.05)and the CV of throughfal percentage decreases with the increase of rainfall depth or rainfall intensity. The cluster analysis shows throughfal percentage amongal sampling sites differs significantly(p<0.05),and the throughfall below the canopy has the evident rainfall concentration in citrus orchard.