Effects of Planting Densities on Production and Dynamics of Litter of Mytilaria laosensis Plantation

doi:10.7525/j.issn.1673-5102.2017.05.018

Abstract

Abstract: Field investigations were made on the production, components and dynamics of litter of Mytilaria laosensis plantation at different planting densities from October 2015 to September 2016 by using 90 litter traps. The production of litter and its components was linearly correlated with the planting densities; the production of total litter, leave, flower and fruit, and miscellaneous litter decreased, but that of branch litter increased with the increasing of planting densities. The annual litter production of M.laosensis plantation at different planting densities varied from 6.52-8.17 t·hm^-2·a^-1. The leave constituted the highest proportion(86.2%-87.85%), followed by miscellaneous components(6.69%-8.89%) while the branch made up 0.35%-5.43%, and flower and fruit accounted for 0.46%-4.67% of annual yield of the litter. The monthly variation of the litter production of leave at different planting densities showed a unimodal mode with the maximum in September and the minimum in March or April. Monthly variation of branch litter was irregular while that of flower and fruit, miscellaneous litter had bimodal seasonal patterns. Flower and fruit fell mainly in May and October, and miscellaneous litter peaked in June and September. The monthly variation of total litter was almost similar to that of leaf litter, but double peaks would occur in some densities under the influence of miscellaneous litter fall in July. With the increase of the planting densities, the height under living branch would be higher, but DBH, crown ratio and crown width would be lower, which might lead to much decline in total litter, leaf, fruit and miscellaneous litter but there would be great enhance in branch litter after the crown.

Key words: planting density, Mytilaria laosensis, litter, dynamics

CLC Number:

Q949.751.4

ZHANG Yang-Feng, YIN Guang-Tian, YANG Jin-Chang, LI Shao-Wei, LI Rong-Sheng, ZOU Wen-Tao. Effects of Planting Densities on Production and Dynamics of Litter of Mytilaria laosensis Plantation[J]. Bulletin of Botanical Research, 2017, 37(5): 768-777.

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