荆门市2000-2020年碳储量变化对土地利用格局的响应

Response of Carbon Storage Changes to Land Use Pattern in Jingmen City from 2000 to 2020

关键词:  土地利用类型  碳储量  贡献率  时空特征  长江流域

Key words:  Land use type  Carbon storage  Contribution rate  spatial-temporal features  Yangtze river basin

摘要:

研究长江流域中部沿岸土地利用方式与生态系统碳储量的关系，对于全面理解陆地碳汇特征和加强生态系统保护具有重要意义。本研究以长江流域沿岸的荆门市为研究对象，利用土地利用转移矩阵、InVEST模型及量化土地利用方式碳储量贡献率等方法，分析了2000年至2020年以来荆门市土地利用类型和碳储量的时空变化，进而探讨了土地利用变化对碳储量的影响。结果如下：（1）从土地利用方式来看，荆门市土地利用类型以耕地和林地为主，在2000-2020年期间，土地利用变化在时间上表现为耕地和林地面积的减少，湿地、建设用地面积的增加；在空间上主要表现为各县市行政中心和汉江流域两岸建设用地不断扩张。（2）从碳储量来看，荆门市2000年、2010年和2020年总碳储量分别为1.445×108 -t、1.439×108 -t和1.434×108 -t，总碳储量空间分布格局呈现东西部高-中部低的特点。（3）从影响碳储量变化因素来看，耕地转化为建设用地对荆门市碳储量的负向贡献率为-93.94%，是荆门市近20年碳储量降低的主要影响因素。研究结果可为双碳目标下荆门市合理规划土地利用格局提供科学依据。

Abstract:

Studying the relationship between land use patterns and ecosystem carbon storage along the central coast of the Yangtze River Basin is of great significance for a comprehensive understanding of land carbon sink characteristics and strengthening ecosystem protection.This study took Jingmen, located along the Yangtze River Basin, as the research object,and used methods including land use transfer matrix, InVEST model, and quantitative land use carbon stock contribution rate to analyze the spatial-temporal changes in LUCC and carbon storage in Jingmen from 2000 to 2020, further exploring the impact of land use changes on carbon storage.The results showed that: (1)From the perspective of land use patterns,the land use types in Jingmen were primarily cultivated land and forestland. During the period from 2000 to 2020, the temporal changes in land use were characterized by a reduction in cultivated land and forestland areas, along with an increase in wetland and construction land areas. Spatially, the changes were mainly reflected in the continuous expansion of construction land in all administrative centers, and along both banks of the Hanjiang River watershed. (2)From the perspective of carbon storage, the total carbon storage in Jingmen in 2000, 2010, and 2020 was 1.445×10?t, 1.439×10?t, and 1.434×10?t, respectively. The spatial distribution pattern of total carbon storage exhibited a characteristic of being high in the east and west and low in the central region. (3)From the perspective of factors affecting changes in carbon storage, the conversion of cultivated land to construction land had a negative contribution rate of -93.94% to the carbon storage in Jingmen, making it the primary factor for the reduction in carbon storage over the past 20 years. These findings provide a scientific foundation for optimizing land use planning under China's dual carbon targets.