Effects of Trunk Distance and Rainfall on Throughfall and Associated Chemical Alterations within a Subtropical Deciduous Forest

Throughfall makes up the major portion of understory rainfall, and thereby plays a vital role in regulating hydrological biogeochemical processes forest ecosystems. The aim this study was to explore alterations throughfall associated chemical composition (Ca2+, Na2+, K+, Mg2+, H+, SO42−, NO3−, Cl−, F−) under Quercus acutissima Carruth. Broussonetia papyrifera (L.) L’Her. ex Vent. trees, relation trunk distance rainfall characteristics. Event-based measurements were carried out from April December 2018 subtropical eastern China. amount (TF) ratio (TF%) Q. (35.7 mm, 83.0%) higher than those B. (32.1 74.7%). Although no significant species differences ion concentrations detected, almost all ions Cl−) enriched after passing through canopies two tree species. TF TF% increased with increasing trunk, while most increased, since approximated. Regression analysis redundancy revealed that amount, duration intensity exerted impacts on generation concentrations, antecedent dry period had notable influence only concentrations. Our findings indicated canopy characteristics play an important compositions.