Characteristics of Dynamic Changes in Forest Carbon Storage Based on the 7th—9th Forest Resource Inventory Data in Ningxia
Dynamic changes in forest carbon storage is of great significance for estimating regional car-bon balance and forest management under the background of climate change.Based on the 7th—9th forest resource inventory data in Ningxia,this study used biomass—stock volume conversion functions and carbon contents of different tree species to analyze the dynamic changes in carbon storage of differ-ent origins,dominant tree species,forest types,and age groups.The results showed that the total carbon storage of forests increased from 5.5629 million t in the 7th forest resource inventory to 7.7430 million t in the 9th inventory,the increase was mainly from the rapid increase in carbon storage in plantations(increasing from 53.0％％to 63.7％).The average carbon density increased from 10.02 t·hm2 to 10.79 t·hm2,which was slightly higher in natural forests than in plantations.In planta-tions,carbon storage in young and middle-aged forests accounted for 84-92％of the total carbon storage,while in natural forests,carbon storage in middle—aged and near—mature forests accounted for 80-85％of the total carbon storage.The proportion of carbon storage in protective forests in-creased from 52.5％in the 7th inventory to 81.8％in the 9th inventory,and the average carbon densi-ty also rapidly increased.Natural forests are mainly composed of special—purpose forests,with rela-tively small changes in carbon storage and a gradual increase in average carbon density.In addition,the rapid increase in the area of poplar trees among dominant tree species has increased the carbon storage and carbon density.Overall,the average carbon density of forests in Ningxia is relatively low,with a large area of new planted shrubs and a high proportion of young and middle—aged forests,in-dicating marked potential for carbon sequestration.
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