项目名称: 基于多源数据同化的杉木人工林碳水循环研究及其不确定性分析
项目编号: No.31270588
项目类型: 面上项目
立项/批准年度: 2013
项目学科: 农业科学
项目作者: 宋晓东
作者单位: 浙江大学
项目金额: 60万元
中文摘要: 森林生态系统碳水循环是陆地表层生物地球化学循环的重要组成部分,正确评估二者间的耦合作用及其对森林碳汇的影响,是提高区域尺度上碳源汇估算准确性的重要环节。人工林植被是我国森林生态系统的重要组成部分,开展区域尺度上的人工林固碳效应及其潜力研究意义重大。本项目以杉木人工林分布广泛的浙江省为研究区,运用森林清查资料、样地调查、野外实验和遥感资料相结合的方式,获取大范围的杉木人工林的生物量、水分利用效率及冠层参量等数据;探讨碳水通量的耦合规律及其与林龄之间的关系;利用贝叶斯方法优化确定森林生长模型的关键参数,研究多尺度观测资料的数据同化算法以改善模拟精度;结合历史气象资料及未来气候变化情景模式,分析区域内杉木人工林碳蓄积能力的时空变化特征;阐明区域内杉木人工林碳储量及其潜在碳汇能力的空间分布格局,建立较为完善的人工林固碳效应估算的方法体系,为区域尺度上的碳循环研究及人工林管理提供重要的科学依据。
中文关键词: 杉木人工林;3-PG2;敏感性分析;不确定性;数据同化
英文摘要: The carbon and water cycles of forest ecosystem are important part of the biogeochemical cycle of the land surface, and it's of crucial importance to correctly evaluate the coupling effects between them to improve the accuracy of the estimation about the carbon source/sink on regional scale. Plantation vegetations are important components of forest ecosystem in China, and the carbon sequestration capability and its potential of the plantation vegetations is of great significant at regional scale. In this project, we select Zhejiang Province, where large area of Chinese fir exists, as the research area. We plan to use forest inventory data, field investigations and experiments, and remote sensing data to retrieve the biomass, water use efficiency, and canopy parameters of the Chinese fir in large area. Key objectives in this project include: 1) Analysing the coupling effects between carbon and water cycles in Chinese fir plantations and their relationships with the stand age; 2) Using Bayesian technique to determine the distributions of the key input parameters of the forest growth model, and applying data assimilation algorithms to improve model prediction accuracy by assimilating multi-scale observation data; 3) Analysing the spatial and temporal evolution features of carbon storage of Chinese fir plantations u
英文关键词: Chinese fir plantation;3-PG2;sensitivity analysis;uncertainty;data assimilation