Amount and Dynamics of Leaf Litter in Three Types of Forest in Tianmushan National Nature Reserve

In January 2018, 3 sample plots with 100 m×100 m were established in evergreen broadleaved forest (EF), evergreen deciduous broadleaved forest (MF) and deciduous broadleaved forest (DF) in Zhejiang Tianmushan National Nature Reserve. Determinations were carried out on DBH, tree height, clear bole height, crowd diameter and species. In September 2018, 9 litter collectors were placed in each plots, and were gathered each two weeks till September 2019, with totally 24 times. The results showed that the annual leaf litter of EF, MF, DF was 4 219.49, 4 591.58 and 4 262.13 kg/ha, the monthly dynamics of leaf litter showed a bimodal pattern, and the trend of change was similar. The first peak of leaf litter occurred in October, and the second one in the next April. The defoliation rhythm of main tree species in the three types of forest could be divided into single peak type, double peak type and irregular type, with different peak periods. Leaf litter of dominant tree species in EF had extremely significant positive relation with the total basal area of tree species, that in MF had extremely positive relation with tree density, height and crown diameter, and that in DF had extremely significant positive relation with the total basal area of tree species.