广西甘蔗碳汇测算方法研究及时空格局分析

Study on estimation and spatial temporal pattern of sugarcane carbon sink in Guangxi Zhuang Autonomous Region

为了实现广西全区植被减源增汇目标,对广西主要经济作物甘蔗的碳吸收和碳排放量进行科学的测算,并开展甘蔗碳汇时空格局的研究分析;利用广西全区14个地级市2010—2020年甘蔗产量、农资投入等相关统计数据测算广西全区甘蔗净碳汇量,并运用空间自相关分析法分析2005—2020年间广西各市时空分布格局。结果表明:2010—2020年,广西全区甘蔗净碳汇量逐步上升;2005—2020年,广西全区甘蔗碳汇量在地级市尺度下不存在明显的全局空间自相关关系;广西全区甘蔗碳汇量逐步形成以南宁市为核心的局部溢出格局,充分利用南宁市的技术、产业优势扩大甘蔗碳汇的空间溢出效应,对提高广西全区的甘蔗碳汇水平至关重要。

To achieve the goal of reducing emissions and increasing carbon sequestration in the Guangxi Zhuang Autonomous Region's vegetation,scientific measurements were conducted to assess the carbon absorption and emission levels of sugarcane,which was a primary economic crop in Guangxi.Additionally,a research analysis was undertaken to study the spatiotemporal pattern of carbon sequestration in sugarcane.This study utilized statistical data on sugarcane production and agricultural input from 2010 to 2020 across Guangxi to calculate the net carbon sink of sugarcane in the entire region.Spatial autocorrelation analysis was employed to analyze the spatiotemporal distribution patterns of sugarcane carbon sink across the 14 prefecture-level cities in Guangxi from 2005 to 2020.The results showed that from 2010 to 2020,the net carbon sink of sugarcane in Guangxi gradually increased.From 2005 to 2020,there was no obvious global spatial autocorrelation of the sugarcane carbon sink in Guangxi at the prefecture-level city scale.The carbon sink of sugarcane in Guangxi gradually formed a local spillover pattern with Nanning city as the core.It was imperative to fully leverage Nanning's technological and industrial advantages to expand the spatial spillover effect of the sugarcane carbon sink,so as to enhance the level of sugarcane carbon sequestration in Guangxi.