Carbon Storage In Tiantong National Forest Park

Global warming due to the acceleration of the process of industrialization and emissions of massive greenhouse gaseshas become a major environment problem of global changes. Forest is in a dominant position in the global carbon cycle because of its huge carbon storage capacity and high productivity. As an important part of forest ecosystems, the evergreen broad-leaved forest is the zonal vegetation of subtropical regions. Based on the field investigation and the data collection from literature, vegetation carbon storage, carbon density, and their spatial distribution were examined across6forest community types (Schima superba-Castanopsis fargesii community, Schima superba-Castanopsis fargesii with C. sclerophylla community, Schima superba-Castanopsis fargesii with Distylium myricoides community, Ulicium lanceolatum-Choerospondias axillaris community, Liquidambar formosana-Pinus massoniana community and Hedyotis auricularia-Phylostachys pubescens community) in Tiantong National Forest Park, Zhejiang Province, by using the allometric biomass models for trees and shrubs. The total carbon storage in the whole ecosystem is further investigated using the carbon density approach. A trend of vegetation biomass carbon change during the last30years is finally compared. Results showed that:1. In2012, among the six communities investigated, carbon storage and carbon density were highest in the Schima superba-Castanopsis fargesii with C. sclerophylla community (storage:12113.92Mg C; density:165.03Mg C·hm-2), but lowest in the Ulicium lanceolatum-Choerospondias axillaris community (storage:680.95Mg C; density:101.26Mg C·hm-2). Carbon storage was significantly higher in evergreen trees than in deciduous trees across six communities. Carbon density ranged from76.08to144.95Mg C·hm-2, and from0.16to20.62Mg C·hm-2for evergreen trees and deciduous trees, respectively. Carbon storage was highest in stems among tree tissues in the tree layer throughout communities. Stems in the forest tree layer of different communities have the highest carbon storages, which account for33.61%-62.66%of the carbon storage of the total tree layer. Such ratios for branches, leaves and roots are8.62%-29.97%,1.95%-22.52%and16.68%-35.12%, respectively. Among vegetation types, evergreen broad-leaved forest had the highest carbon storage (23092.39Mg C), accounting for81.73%of total carbon storage in all forest types, with carbon density of126.17Mg C·hm-2.Total carbon storage for all vegetation types in Tiantong National Forest Park was28254.22Mg C, and carbon density was96.73Mg C·hm-2. The carbon storage of Tiantong National Forest Park is60069.35Mg C. The evergreen broad-leaved forest has the highest carbon storage, accounting for79.85%of total carbon storage of all forest types.2. In1982, Schima superba-Castanopsis fargesii community had the highest carbon density of365.67Mg C·hm-2. The carbon density of evergreen trees was significantly higher than that of deciduous trees in all six communities. The carbon density of evergreen trees in Schima superba-Castanopsis fargesii community was the highest(285.22Mg C·hm-2). Ulicium lanceolatum-Choerospondias axillaris community had the the highest carbon density of deciduous trees (128.56Mg C· hm-2).