厦门城市森林碳储量和碳密度时空变化特征

Spatiotemporal dynamics of carbon storage and density of urban forest in Xiamen city

基于4期森林资源规划设计调查资料,运用生物量转换因子连续函数法,结合GIS空间分析手段,分析了厦门市城市森林主要植被类型碳储量和碳密度在不同城市化区域的时空变化特征。结果表明,1972-2006年,厦门市城市森林碳储量呈现出前期上升,后期小幅下降,总体上升的趋势,34 a间城市森林碳储量增加了865 589.71 t。在城市化梯度上,碳储量大小为中心区<近郊区<远郊区,碳密度大小为中心区>近郊区>远郊区。这主要是由于近郊区和远郊区面积比例较大以及不同区域间植被类型和龄组结构的差异,更深层次的原因是在城市化的快速发展过程中,土地利用变化、植树造林、人为经营管理活动等因素共同影响城市森林碳汇功能。

Based on Xiamen forest management planning inventory data in 1972, 1988, 1996 and 2006, the spatiotemporal dynamics of urban forest carbon storage and carbon density of major vegetation types in different urbanization zones were analyzed by the method of variable biomass expansion factors and GIS. The results showed that forest carbon storage had increased by 865 589.71 t from 1972 to 2006 （34 years） in Xiamen, with a rapid increase trend from 1972 to 1996, and then relatively slight decrease from 1996 to 2006. The order of carbon storage along the urban gradient was urban core 〈 suburb 〈 exurb, while carbon density was contrarily urban core 〉 suburb 〉 exurb. That was mainly due to the larger proportion of exurban and suburban areas and the differences in vegetation types, stand ages in these three zones. The underlying reasons were that as urbanization developed rapidly, carbon sink of urban forest was affect by LUCC, afforestation, forest management and so on.