典型高原高寒气候区生态系统碳储量演变规律探究——以四川省三州地区为例

Research on the evolution law of ecosystem carbon stocks in typical highland alpine climate zones:taking the three Prefectures in Sichuan Province as an example

碳储量在维持生态系统平衡中扮演着举足轻重的作用。高原高寒气候区因其得天独厚的自然禀赋拥有丰富的碳储量,对其碳储量进行估算并分析,对协调与优化区域土地利用格局、提高区域生态系统碳储量潜力具有重要参考价值。以典型高原高寒气候区-四川省三州为例,了解2000~2020年土地利用变化,估算其碳储量时空变化,并分析其区县碳储量空间自相关。结果如下:(1)20年间研究区草地及林地占比最大,占四川三州总面积的90%以上;2000~2020年土地利用转移面积占总面积的5.28%,湿地的转换概率最大。(2)2000年、2010年、2020年碳储量分别为3116.24×10^(6) t、3115.31×10^(6) t、3112.68×10^(6) t,呈现持续减少趋势;20年间,共有24个区县碳储量上升,24个区县碳储量下降,表明研究区碳储量变化在区县上呈现分化状态。(3)全局自相关结果表明,研究区在区县碳储量上呈正相关;局部自相关结果表明,碳储量出现高-高聚集区域在四川三州西部,出现低-低聚集的区域在四川三州南部。研究有助于深入了解四川三州碳储量时空演变情况,并助力其县域生态文明建设及“双碳”目标实现。

Carbon stocks play a pivotal role in maintaining ecosystem balance.Due to its unique natural endowment,the highland alpine climate zone has rich carbon stocks,and the estimation and analysis of its carbon stocks are of great reference value for coordinating and optimizing the regional land-use pattern and improving the potential of regional ecosystems in terms of carbon stocks.Taking the three Prefectures,the typical plateau alpine climate zone,in Sichuan Province as an example,the land use changes from 2000 to 2020 was understood,the spatial and temporal changes of its carbon stock was estimated,and the spatial autocorrelation of its district and county carbon stocks was analyzed.The results were as follows:(1)From 2000 to 2020,grassland and woodland accounted for the largest proportion in the study area,accounting for more than 90%of the total area of the three Prefectures in Sichuan Province.From 2000 to 2020,the land use transfer area accounted for 5.28%of the total area,and wetlands had the highest conversion probability.(2)The carbon stocks in 2000,2010 and 2020 were 3116.24×10^(6),3115.31×10^(6) and 3112.68×10^(6),respectively,showing a continuous decreasing trend.During the studied 20-year period,the carbon storage in 24 districts and counties was increased,while in the other 24 districts and counties the carbon storage was decreased,indicating that change in carbon stocks in the study area was in a differentiated state in terms of districts and counties.(3)The global autocorrelation results showed that there was a positive correlation in terms of districts and counties for the carbon storage.The local autocorrelation results showed that the high-high accumulation area of carbon stocks was in the west part of the study area,and the low-low accumulation area was in the south part of the study area.This study contributes to an in-depth understanding of carbon stocks in the three prefectures of Sichuan and assists in the construction of ecological civilization and achieving the goal of"double carbon".