成都市森林植被碳储量及空间分布格局

Carbon Storage and Spatial Distribution Pattern of Forest Vegetation in Chengdu

为了探明成都市森林植被碳储量和碳密度的数量特征及空间分布规律,以成都市2017年森林资源规划设计调查成果为数据源,运用生物量转换因子法估算生物量,实测和选取植被含碳率,基于小班尺度估算成都市的森林植被碳储量和碳密度,并运用ARCGIS 10.5软件进行空间分布格局分析。结果显示:(1)全市森林植被总碳储量为1.3369×10^(7) t,平均碳密度为11.71 t/hm^(2),其中林分碳储量占78.50%,是全市碳储量的主体,呈稳定持续增长型结构。(2)在空间分布上,全市森林植被碳储量和吸存能力总体呈西北高东南低的格局,由西北向东南可分为4个区,即西北部龙门山脉高储量高吸存区、中部平原分散型中储量低吸存区、中东部龙泉山中碳储量较高碳吸存区、龙泉山东侧的丘陵台地低碳储量和低吸存区;海拔分布格局表现为随海拔增加,总体呈以中海拔区域为最高倒“V”字型变化趋势;坡度分布格局为随坡度的增加,碳储量总体呈以缓坡为最高的先增后降的变化趋势,吸存能力则呈以陡坡为最高的先快速增加后缓慢降低的变化趋势。研究结果表明,成都市森林植被固碳能力呈现出明显的区域分布不均,全市森林植被增“汇”宜采取一区一策,因地制宜的策略。

To explore the quantitative characteristics and spatial distribution of carbon storage and density of forest vegetation in Chengdu,the biomass was estimated by biomass conversion factor method,and the carbon content of vegetation was measured based on the latest results of forest resources investigation in Chengdu.The carbon storage and density of forest vegetation in Chengdu were estimated based on small class scale,and the spatial distribution pattern was analyzed by ARCGIS software.The results showed that the total carbon storage of forest vegetation in the city was 1.3369×10^(7) t,and the average carbon density was 11.71 t/hm^(2).The forest carbon storage accounted for 78.50%,which was the main body of carbon storage in the city,showing a stable and sustainable growth structure.From northwest to Southeast,it can be divided into four areas:Longmen mountain high carbon storage area in northwest,dispersed low carbon storage area in central plain,Longquan Mountain high carbon storage area in Middle East and hilly platform low carbon storage area in east of Longquan.With the increase of altitude,the change trend of inverted“V”shape was the highest in the middle altitude area.With the increase of slope,the carbon storage increased first and then decreased,and the carbon storage capacity increased first and then decreased slowly.In order to increase the“sink”of forest vegetation in the city,the strategy of“one district,one policy”and“adjusting measures to local conditions”should be adopted.