Abstract:Forest ecosystem is the main body of the terrestrial ecosystem. The well-developed canopy of forest ecosystem profoundly influences the hydrological flux and water output in the whole process of watershed by regulating precipitation amount and changing precipitation intensity. Based on the annual-scale monitoring data of forest rainfall redistribution processes (i.e., throughfall, stemflow, canopy rainfall interception) widely carried out in different forest ecosystems in China during 1983-2022, this paper reveals the rainfall redistribution and canopy rainfall interception characteristics of typical forest ecosystems in China, and elucidates the relationship between forest canopy rainfall interception characteristics and precipitation (i.e., rainfall amount) and vegetation structural variables (i.e., mean height, mean diameter at breast height, leaf area index). The results showed that the annual throughfall of different forest ecosystems in China ranged from 141.4 to 2450.0 mm, with throughfall rates of 36.3%-92.3%. The average multi-year throughfall of five typical forest ecosystems ((445.3±252.9)-(1230.6±479.6) mm) accounted for (72.6±9.2)%-(77.4±8.9)% of the annual mean rainfall. The annual stemflow of the different forest ecosystems ranged from 0 to 508.2 mm, accounting for 0% to 25.8% of the annual mean rainfall during the same period. The multi-year average stemflow in the five typical forest ecosystems ((9.8±17.3)-(87.8±81.6) mm) accounted for (1.4±1.9)%-(5.4±4.6)% of the annual mean rainfall. Canopy rainfall interception in different forest ecosystems ranged between 25.7 to 812.9 mm, representing 4.2%-55.6% of annual rainfall in the different forest ecosystems. The multi-year average canopy rainfall interception of five typical forest ecosystems ((154.2±81.6)-(392.2±203.5) mm) accounted for (18.7±7.4)% to (25.9±8.3)% of the annual mean rainfall during the same period. Further analysis showed that the amount of throughfall, stemflow, and canopy rainfall interception showed a significant increase (P<0.05) with the increase of annual rainfall in the corresponding observation region, respectively. In contrast, the annual throughfall rate and annual stemflow rate of different forest ecosystems in China showed an increasing trend with the increase of annual rainfall (P<0.05), while the annual canopy interception rate showed a significantly negative correlation with annual rainfall (P<0.01). Rainfall amount and leaf area index were demonstrated to be the main factors deeply influencing canopy redistribution characteristics (including canopy rainfall interception) in forest ecosystems at an annual scale. On the whole, the regulation ability of canopy rainfall interception was obviously different among typical forest ecosystems in China, the canopy interception rate was obviously characterized by deciduous forests being larger than evergreen forests, and coniferous forests being larger than broad-leaved forests.