Abstract:Exploring dynamics in litter production and their environmental driving mechanisms are important for maintaining the productivity and carbon sequestration of forest ecosystem. In this study, we selected four natural secondary forest stands (i.e., hardwood stand, aspen-birch stand, mixed deciduous stand, and Mongolian oak stand) and two plantations stands (Dahurian larch plantation and Korean pine plantation) in the Zhangguangcai Range of Changbai Mountain, which had similar stand age but various site conditions and stand compositions; and we continuously measured the litterfall and its components and related environmental factors for 14 years (from 2008 to 2021) with an aim of understanding the spatio-temporal variations in above-ground litter production and their environmental drivers. The results showed that there was no significant difference in the total litterfall (TL) among the six forest types, varying from 500.5 to 556.1 g m-2 a-1. However, there were significant differences in the litter production of leaves (LL), reproductive tissues (RT), and other tissues (OT) among the forest types, varying from 333.9 to 391.8 g m-2 a-1, 8.43 to 69.93 g m-2 a-1, and 93.4 to 185.9 g m-2 a-1, respectively. There were significant inter-annual variations in TL of the six forest types, of which the significance degree for LL and OT varied with forest types; but there was no significant inter-annual difference in RT of all the forest types. LL was positively correlated with mean daily temperature, mean daily minimum temperature, mean daily soil temperature at the 10 cm depth, mean daily minimum soil temperature at 10 cm depth (Tsmin) and soil moisture content at the 5 cm depth (Ms) during the growing season in all the forest types except for Dahurian larch plantation. RT was negatively correlated with Ms in the mixed deciduous stand, hardwood stand and Korean pine plantation, while OT was negatively correlated with Tsmin in the mixed deciduous stand, aspen-birch stand and hardwood stand. The plot-level LL was positively correlated with soil moisture content at 10 cm depth, whereas the plot-level RT and OT were negatively correlated. These findings indicated that the temperate forests with similar forest age tended to converge their above-ground litter production, and adapted to various site conditions by changing the distribution pattern of litter components. The fluctuation of soil moisture and temperature resulted in inter-annual variations in litter production, and their sensitivity to environmental changes depended on forest types.