中国西南部的金沙江干热河谷地带是生态脆弱区，其新造林碳汇是林业碳汇的重要组成部分。但目前对干热河谷地区森林碳汇能力的研究尚不充分，新造林的碳汇能力尚不明确。以2014-2021年宾川县新造人工林为典型研究对象，通过陆地生态系统生产力模拟(BEPS)模型，研究金沙江干热河谷地带的碳汇能力特征。结果表明:①宾川新造人工林碳汇能力在2014-2016年逐渐升高，随后稳定，年均净生态系统生产力(net ecosystem productivity，NEP)为 247。82±140。59 g C/(m2/a);②宾川县人工林每年碳汇量自2014年起逐年增加，从2014年的2398。2 t C/a提升到2021年24028。1 t C/a;③宾川县人新造工林生态系统整体碳汇能力呈现东部和北部高，西南部低的分布趋势，各乡镇年均NEP在167。44～349。85 g C/(m2/a)，碳汇量在468。42～3832。72 t C/a;④不同造林类型的碳汇能力存在显著差异，阔叶灌木混合林的NEP显著高于其他类型林地。探究了宾川县新造工林的碳汇能力特征，研究结果为金沙江干热河谷地带的碳汇供能评估提供了科学基础，为区域植被恢复和造林碳汇提供了理论基础和技术支持。
Study on the Change of Carbon Sink Capacity of Newly Afforested Forest in the Dry-Hot Valley Area of Jinsha River——Taking Binchuan County,as an Example
The dry-hot valley of the Jinsha River in Southwest China is an ecologically fragile area,with newly af-forested forests being a crucial component of forestry carbon sinks.However,the research on the carbon sink ca-pacity of these forests in the dry-hot valley is not sufficient,and the carbon sink capacity is not clear.This study focuses on newly afforested artificial forests in Binchuan County from 2014 to 2021.Using the Boreal Ecosystem Productivity Simulator(BEPS)model,the characteristics of the carbon sink capacity in this region are investiga-ted.The results indicate that:① The carbon sink capacity of newly afforested artificial forests in Binchuan in-creased gradually from 2014 to 2016,then stabilized,with an average annual net ecosystem productivity(NEP)of 247.82±140.59 g C/(m2/a);② The annual carbon sink of artificial forests in Binchuan increased annually from 2398.2 t C/a in 2014 to 24028.1 t C/a in 2021;③ The overall carbon sink capacity of newly afforested artificial forests in Binchuan shows a spatial pattern of higher capacity in the east and north and lower in the southwest,with average annual NEP ranging from 167.44 to 349.85 g C/(m2/a),and carbon sink ranging from 468.42 to 3832.72 t C/a among different towns;④ There are significant differences in the carbon sink capacities of different types of plantations,with broadleaf shrub mixed forests having significantly higher NEP than other types of forests.This study explores the carbon sink characteristics of newly afforested artificial forests in Binchuan,providing a scien-tific basis for evaluating the carbon sink capacity of the dry-hot valley of the Jinsha River,and offering theoretical and technical support for regional vegetation restoration and afforestation carbon sink.
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