高寒地区草地植被碳密度变化规律及其空间分布特征研究——以昌都市为例  

Research on the Changes and Spatial Distribution Characteristics of Carbon Density of Grassland Vegetation in Alpine Regions——Taking Changdu City as an Example

作　　者：彭泰来 李佳 叶海燕[2] 张伟焕 梁曾飞 刘扬晶 米玛次仁 刘金山 PENG Tailai;LI Jia;YE Haiyan;ZHANG Weihuan;LIANG Zengfei;LIU Yangjing;Mimaciren;LIU Jinshan(Central South Academy of Inventory and Planning of NFGA,Changsha 410014,Hunan,China;Fujian Academy of Forestry Sciences,Fuzhou 350012,Fujian,China;Institute of Tibetan Plateau Research Chinese Academy of Sciences,Beijing 100101,China;Forestry Survey and Planning Research Institute of Xizang Autonomous Region,Lhasa 850005,Xizang,China)

机构地区：[1]国家林业和草原局中南调查规划院,湖南长沙410014 [2]福建省林业科学研究院,福建福州350012 [3]中国科学院青藏高原研究所,北京100101 [4]西藏自治区林业调查规划研究院,西藏拉萨850005

出　　处：《中南林业调查规划》2024年第2期69-73,共5页Central South Forest Inventory and Planning

基　　金：国家林业和草原局中南调查规划院2023年度院立项科技创新项目“高寒地区草地碳储量计量与固碳功能评估研究”(2023010);福建省林业科学技术研究项目“昌都市草地碳储量调查与计量研究”。

摘　　要：基于实地调查数据和2022年昌都市林草生态综合监测成果矢量数据库,以及Sentinel-2和Landsat-8遥感数据,以昌都市为例,对高寒地区草地植被的地上部分和地下根系的碳密度进行估测,并使用集成学习算法和优化的前向特征筛选方法构建了最优的昌都市草地植被碳储量估测模型(STK-SVR),利用该模型对昌都市草地植被碳密度的空间分布进行分析。结果表明:昌都市草地植被碳密度分布范围为0.02~29.77t/hm^(2),碳密度平均值为8.53t/hm^(2),地下碳密度远高于地上碳密度;昌都市的天然牧草地、高寒草甸类的小班数量多,中南部和东北部的草地碳密度高,西北部和东南部的草地碳密度较低;不同海拔、坡向、坡度的草地植被的最大碳密度分别分布在3560~4059m、东坡、缓坡区域。研究结果是对高寒地区草地碳汇计量监测的前期探索,以期为青藏高原其他区域进一步开展森林、草地、湿地等碳储量调查与计量工作提供参考。Based on the field data,Sentinel-2 and Landsat-8 remote sensing data,and the vector database of comprehensive monitoring results of forest and grassland ecology in Changdu in 2022,we estimated the carbon density of grassland in Changdu.The optimal vegetation carbon storage estimation(STK-SVR)of grassland in Changdu was constructed by using an ensemble learning algorithm and optimized forward feature screening method.Then we analyzed the spatial distribution of carbon density of grassland vegetation in Changdu by the model.The results showed that the carbon density of grassland vegetation was in the range of 0.02~29.77 t/hm^(2),with a mean of 8.53 t/hm in Changdu.The underground carbon density of grassland vegetation was much higher than the aboveground carbon density of grassland vegetation.The grassland carbon densities in the central south and northeast were higher than the the northwest,and southeast parts of Changdu.The maximum carbon density of grassland vegetation at different altitudes,slopes,and orientations is distributed in the areas of 3560~4059 meters,east slope,and gentle slope,respectively.This study is an initial exploration for calculating grassland carbon sink in the alpine region,which aims to provide insights and references to related research conducted on Qinghai-Xizang plateau in the future.

关 键 词：碳密度 草地 空间分布 高寒地区 昌都市 

分 类 号：S718[农业科学—林学] S812