关键词: 凋落叶, 母树, 阔叶红松林, 长白山, 干湿交替灌溉,  , 水稻,  , 稗草,  , 产量,  , 生理特性

Abstract: In order to understand the composition and spatiotemporal dynamics of the litter falls at community level in a broad-leaved Korean pine mixed forest in Changbai Mountains, litter falls were collected from 150 containers in a 25 hm² permanent plot in 2008. The leaf litters in the containers were from 35 tree species, accounting for 67.3% of the total number (52) of the tree species with DBH≥1 cm in the plot. The litter falls had a weight 29.39 kg, equivalent to 3918.4 kg·hm^-2, among which, broad leaves, miscellany, needle leaves, and branches occupied 61.7%, 18.0%, 11.7%, and 8.6%, respectively. About 83.8% of the broad leaves were from Tilia amurensis, Fraxinus mandshurica, Quercus mongolica, Acer mono, and Ulmus japonica. The litter falls showed an evident seasonal dynamics, with the peaks occurred from 13 September to 10 October, e.g., the litter falls from T. amurensi and Pinus koraiensis peaked in 13-26 September, while those from Q.mongolica, U. japonica, and A. pseudo sieboldianum peaked in 27 September to 10 October. There was a great difference in the mass of the litter falls among the containers, e.g., with 150-200 g litters in 68 containers and >500 g litters in 1 container. The species number of the litter falls in a container was 18 in maximum, and was 12 in common (32 containers). Litter falls mass was positively proportional to the sum of the basal area at breast height of parent trees in the plot, and the amount of the litter falls in the containers was related with the locations of the containers, exhibiting an evident spatial heterogeneity in the plot.

Key words: leaf litter, parent trees, broad-leaved Korean pine mixed forest, Changbai Mountains, alternate wetting and drying irrigation, rice, barnyardgrass, yield, physiological characteristics.