基于第7至9次森林资源清查的宁夏森林碳储量动态变化特征  

Characteristics of Dynamic Changes in Forest Carbon Storage Based on the 7th-9th Forest Resource Inventory Data in Ningxia

作　　者：马振华 MA Zhen-hua(Northwest Inventory and Planning Institute of National Forestry and Grassland Administration,Xi'an,Shaanxi 710048)

机构地区：[1]国家林业和草原局西北调查规划院,西安710048

出　　处：《陕西林业科技》2024年第3期39-45,共7页Shaanxi Forest Science and Technology

摘　　要：研究森林碳储量动态变化,对区域碳收支估算和气候变化背景下森林经营管理具有重要意义。基于宁夏第7~9次森林资源清查数据,采用生物量—蓄积量转换函数和不同树种含碳率,分析了不同起源、优势树种、林种和龄组的碳储量动态变化特征。结果表明:森林总碳储量从第7次森林资源清查的556.29万t增加到第9次的774.30万吨,主要来自人工林碳储量的快速增加(占比从53.0%增加至63.7%),平均碳密度从10.02 t·hm-2增加至10.79 t·hm-2,天然林略高于人工林。人工乔木林中幼龄林碳储量占总碳储量的84%~92%,天然乔木林中龄林和近熟林碳储量占总碳储量的80%~85%。人工防护林碳储量占总碳储量的比例从第7次森林资源清查52.5%增加到第9次81.8%,平均碳密度也快速增加;天然乔木林主要以特用林为主,特用林碳储量变化相对较小,平均碳密度也逐渐增加。此外,优势树种中杨树面积的快速增加,提高了乔木林碳储量和碳密度。总体上,宁夏森林平均碳密度较低,新增灌木林面积大,乔木林中幼龄林比例较高,具有较大的固碳增汇潜力。Dynamic changes in forest carbon storage is of great significance for estimating regional carbon 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 different 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·hm^(2) to 10.79 t·hm^(2),which was slightly higher in natural forests than in plantations.In plantations,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 increased from 52.5% in the 7th inventory to 81.8% in the 9th inventory,and the average carbon density also rapidly increased.Natural forests are mainly composed of special-purpose forests,with relatively 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,indicating marked potential for carbon sequestration.

关 键 词：森林资源 碳储量 碳密度 碳汇 宁夏 

分 类 号：S718.5[农业科学—林学]