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动态评估生态系统碳储量的影响,有助于揭示全球变化对生态系统碳循环的驱动机制,同时为生态系统综合管理提供决策参考。采用InVEST模型,结合森林资源清查资料(1992,2007,2012年)和生物碳实测数据,动态评估了四川省宝兴县生物碳储存状况。结果表明,过去20年宝兴县生态系统总生物碳密度呈现增加的趋势,从1992年的23.19t/hm2增加到2012年的50.68t/hm2。宝兴县1992,2007,2012年生物碳储量分别为724.57万t,1 327.36万t和1 582.94万t,年平均增长率为3.98%。可见,过去20年期间四川宝兴县的植被起到了强烈的碳汇作用。研究还发现,该县生物碳储量增加主要是由于有林地固碳量的增加引起,有林地生物碳储量分别为457.98万t,1 059.72万t和1 376.57万t。同时,1992—2012年宝兴县生物碳储量的高值区范围逐渐扩大,但其主要分布在中海拔山区的空间格局并没有改变。
The dynamic assessment of the impact of ecosystem carbon storage can help reveal the driving forces of global change on the ecosystem carbon cycle and provide a reference for the integrated management of ecosystems. Based on the InVEST model and the forest inventory data (1992, 2007, 2012) and biochar measurements, the status of biochar storage in Baoxing County of Sichuan Province was dynamically evaluated. The results show that the total bio-carbon density of Baoxing ecosystem shows an increasing trend over the past 20 years, from 23.19 t / hm2 in 1992 to 50.68 t / hm2 in 2012. The biological carbon stocks of Baoxing County in 1992, 2007 and 2012 were 7,245,700 tons, 13,327,600 tons and 15,829,400 tons respectively, with an average annual growth rate of 3.98%. It can be seen that the vegetation in Baoxing County of Sichuan Province has played a strong role in carbon sink during the past 20 years. The study also found that the increase of bio-carbon in this county was mainly caused by the increase of carbon sequestration in forestland, with the reserves of forest carbon of 4.5798 million tons, 105.972 million tons and 37.657 million tons respectively. At the same time, the range of high value areas of biological carbon stock in Baoxing County gradually expanded from 1992 to 2012, but the spatial pattern of its distribution mainly in the mid-elevation mountain areas has not changed.