宜宾市土地利用碳排放效应的时空演变

Temporal and Spatial Patterns of Carbon Emission in the Yibin's Land Use

碳排放和土地利用变化之间密切相关,土地利用是造成全球碳排放总量迅猛增长的重要原因之一.本研究采用2000—2010年宜宾市土地利用数据与能源消费数据,通过构建碳排放模型,对研究区11年来土地利用的碳排放进行了定量分析.结果表明:1)2000—2010年宜宾市碳排放总量呈逐年递增的趋势,碳排放总量由2000年的185.559 9万t增长至了2010年的490.823 2万t,增长率高达165%;建设用地是最主要的碳源,而林地为最重要的碳汇.2)据中国造林成本的价格估算,宜宾市在研究期内需要年均拿出1.5%~2.6%的生产总值来支付碳失衡所导致的生态补偿量.3)宜宾市各区县的碳排放强度在研究期内呈现出"先增后减"和"持续增长"两种不同的变化类型.4)宜宾市各区县的碳汇、碳源及碳排放总量空间格局差异显著,碳源和碳排放总量表现出以"翠屏区为中心,向两侧递减"的格局,而碳汇能力较强的区县则主要位于西北部和南部山区地带.

Land use,a key factor in rapid increase of global carbon emissions,has a close relationship with carbon emissions. In this study,we developed carbon emission model and carried out research in the Yibin City to estimate carbon sinks and carbon sources,based on energy consumption and land use change data from 2000 to2010. The results showed that：（ 1） the total carbon emissions increased gradually from 2000 to 2010 in Yibin City,and the total carbon emissions risen from 185. 559 9 kt in 2000 to 490. 823 2 kt in 2010; construction land was the main carbon source,while forest land the most important carbon sinks.（ 2） Based on average cost of tree planting in China,Yibin city should take out 1. 5%-2. 6% of GDP to pay for their carbon imbalance cost caused by ecological compensation every year from 2000 to 2010.（ 3） In this period,carbon emissions was featured with two types of patterns： ＂ Firstly rise then falling＂ and ＂ Continue to rise＂.（ 4） The carbon sinks and carbon sources in Districts and Counties of Yibin city had significant spatial patterns,in which carbon sinks and carbon sources showed ＂ Cui Ping county as the center,other places decreasing on both sides＂,and the counties,whose carbon sink ability was strong,mainly located in the northwest and southern mountainous areas.