柑桔园林下穿透雨的分布特征

Variation characteristics of throughfall in citrus orchard

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(245.1 mm),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。

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.