ZHANG Bin,XIA Qiuyue.Topographic Gradient Effect and Vulnerability Analysis of Carbon Storage in Wuhan Urban Circle[J].Research of Soil and Water Conservation,2023,30(05):443-452.[doi:10.13869/j.cnki.rswc.2023.05.002.]
武汉城市圈碳储量的地形梯度效应及脆弱性
- Title:
- Topographic Gradient Effect and Vulnerability Analysis of Carbon Storage in Wuhan Urban Circle
- 文章编号:
- 1005-3409(2023)05-0443-10
- 分类号:
- X171.1
- 文献标志码:
- A
- 摘要:
- [目的]准确评估区域碳储量的时空分异,分析其地形梯度效应及对土地利用的脆弱性,对区域“双碳”目标的实行具有重要意义。[方法]以武汉城市圈为例,采用InVEST模型借助GIS平台评估区域碳储量的时空分异特征,并基于DEM数据运用地形位指数探讨碳储量的地形梯度效应,再利用潜在影响指数揭示碳储量的脆弱性。[结果](1)武汉城市圈2005—2020年总碳储量先减少后增加,在空间分布上呈现中西低、南北高态势,城市间内部差异较大。(2)武汉城市圈的地形位整体上表现为中西部低、南北部高态势,1级占比最大。由空间自相关分析可知,区域地形位与碳密度呈现显著空间正相关关系。(3)耕地转向建设用地是造成区域碳储量流失的主要原因,导致碳流失高达7.068 Tg,而耕地向林地的转化是区域碳储量增加的主要原因,扩充区域碳库7.62 Tg。就碳储量的脆弱性评估而言,从城市圈整体上来看,2005—2020年的PI指数均为负,表明区域土地利用会对碳储量造成负面的潜在影响。[结论]武汉城市圈碳储量总体上有所减少且内部城市差异较大,地形位与碳密度呈显著正相关,土地利用变化导致碳储量的脆弱性较高。
- Abstract:
- [Objective] Accurately assessing the spatial and temporal differentiation of regional carbon storage, and analyzing its topographic gradient effect and vulnerability to land use, are of great significance for the implementation of the regional ‘two carbon' goal. [Methods] Wuhan urban circle was taken as an example. The InVEST model was used to evaluate the spatial and temporal differentiation characteristics of regional carbon storage with the help of GIS platform, and based on DEM data, the terrain index was used to explore the topographic gradient effect of carbon storage, and the potential impact index was used to reveal the vulnerability of carbon storage. [Results](1)From 2005 to 2020, the total carbon storage in Wuhan urban circle first decreased and then increased, showing a trend of low in the middle and west and high in the north and south in terms of spatial distribution, with large differences between cities.(2)The topographic position of Wuhan urban circle is generally low in the central and western regions and high in the north and south, with the largest proportion of level 1. From the spatial autocorrelation analysis, it can be seen that there is a significant positive spatial correlation between regional topographical position and carbon density.(3)The conversion of cultivated land to construction land is the main reason for the loss of regional carbon storage, resulting in a carbon loss of up to 7.068 Tg, while the conversion of cultivated land to forest land is the main reason for the increase of regional carbon storage, expanding the regional carbon pool by 7.62 Tg. As far as the vulnerability assessment of carbon storage was concerned, from the perspective of the urban circle as a whole, the PI indices from 2005 to 2020 were all negative, indicating that regional land use could have a negative potential impact on carbon storage. [Conclusion] The carbon storage in Wuhan urban circle has generally decreased and there are significant differences among internal cities. The topographic position is significantly positively correlated with carbon density, and the vulnerability of carbon storage is high due to land use change.
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备注/Memo
收稿日期:2022-07-11 修回日期:2022-08-06
资助项目:国家自然科学基金面上项目“土地发展空间异质性与跨区域碳排放权交易及补偿机制研究:以武汉城市圈为例”(71774064)
第一作者:张斌(1997—),男,湖北武汉人,博士研究生,主要研究方向为土地资源与经济。E-mail:1480992336@qq.com
夏秋月(1993—),女,河南新乡人,博士研究生,主要研究方向为区域经济与低碳土地利用。E-mail:xiaqiuyue231231@163.com