Dynamic Changes of Carbon Stocks of Arbors in Experimental Center in Guangxi

Estimation was made on carbon stocks by biomass regression model and parameters of arbors in Experimental Center which was managed near-nature in Guangxi based on data of 238 systematic sampling plots in 2011, 2013 and 2015.The results showed that carbon stocks increased from 605 826.95 t in 2011 to 721 847.04 t in 2015.The average carbon density increased from 35.94 t·hm-2 in 2011 to 42.34 t·hm-2 in 2015, but still less than the national and world means.Carbon stocks of coniferous forest were higher than those of broad-leaved forest, which increased from 413 753.07 t in 2011 to 479 611.05 t in 2015.Quercus had greatest increase range of carbon stocks in broad-leaf trees, with an annual growth rate of 64.00%.Pinus massoniana had the largest carbon stocks, accounting for 62.92% of the total.