Characteristics Of Community And Litter Of Mid-subtropical Schima Superba And Pinus Massoniana Plantations In Restoration Processes

In order to find out the rules of communities and nutrients cycling at different successional series, and give some theoretic supports for resuming monoculture, scientific and sustainable managing forest resources, the dynamics of communities and litter of mid-subtropical Schima superba and Pinus massoniana plantations in Fuzhou Forestry Park were studied.Adopting the concept of space as a substitute for time, the communities were investigated and divided into 4 restoring types with the IV indexes of arbor layers. Species richness, diversity, niche, spatial distribution patterns and biomass were used to analyze characteristics of the communities, the results showed that: after several decades of closing the land for reforestation, Schima superba have been the dominant population of the communities, and configurations and circumstances of these plantations have became better. These plantations are gradually restoring as zonal vegetation, now the communities are in the middle of succession series of mid-subtropical vegetation. But the vertical configurations are simple, species richness and diversity are few, and the artificial effect till strong affected niches and spatial distribution of populations. The configurations of communities are fragile, and populations are competing vehemently with each other's.The average litter pool in the communities was 9.209 t/hm~2, the amount of different organs were in the sequence of leaf>branch>miscellany>flower and fruit. The average litterfall of the communities was 7.080 t/hm~2, and the monthly amount of different organs were in the sequence of leaf>branch>flower and miscellany>fruit>bark. The seasonal patterns of littering exhibited anomaly two peaks and leaf was the dominant component, and climate change, biological and ecological characteristics of the species were the main influence factors.The annual total amount of nutrient in litter returning to soil were 4 252.1 kg/hm~2, of which the Organic C accounted for 94.89%> N accounted for 3.05%, the amounts of six major nutrients were in the sequence of C>N>Ca>K>Mg>P and four micro-nutrients were Fe>Mn>Zn>Cu. The amounts of Schima superba leaves and Organic C in litter determined the annual amount and change dynamics. In the four kinds of litter, N,K, Mg, Mn in leaves, C, Ca, Cu, Zn in branch> P in fruit and Fe in flower and miscellany were very important for maintaining sites productivity.The annual decomposition ratio of the four kinds of litter were in the sequence of Schima superba leaf>Pinus massoniana needle>Schima superba branch>Pinus massoniana branch, the change rhythm of decomposition ratio were fast—slow—fast and were influenced by quantities of moisture and heat of environmental. Quality and figuration were the main...