TAN Tenghui,JIAO Xiong,PING Yuan,et al.Ecological Carrying Capacity Evaluation Based on Spatial and Temporal Evolution of Soil Erosion at County Scale[J].Research of Soil and Water Conservation,2023,30(04):210-216.[doi:10.13869/j.cnki.rswc.2023.04.015.]
基于土壤侵蚀时空演变的县域生态承载力评价
- Title:
- Ecological Carrying Capacity Evaluation Based on Spatial and Temporal Evolution of Soil Erosion at County Scale
- 文章编号:
- 1005-3409(2023)04-0210-07
- Keywords:
- land use change; InVEST model; degree of soil erosion; ecological carrying capacity; Ningdu County
- 分类号:
- S157.1
- 文献标志码:
- A
- 摘要:
- [目的]探究土地类型变化背景下土壤侵蚀和生态承载力的时空演变及相关关系,对提高生态承载力水平、优化土地利用结构和水土保持措施配置具有重要意义。[方法]以江西省宁都县为研究区域,基于自然资源和社会经济数据,运用InVEST模型与空间主成分方法,分析了土壤侵蚀变化对生态承载力的影响。[结果](1)宁都县主要土地利用类型为林地、耕地和草地,9年来土壤侵蚀程度2010年>2015年>2018年,分别为597.42,591.29,583.51 t/(km2·a),侵蚀类型以微度为主,在中部、西北部和东南部等地区,建设用地和耕地土壤侵蚀程度严重。(2)宁都县生态承载力西南低、东北高,9年来生态承载力整体上略有好转; 三期土壤侵蚀程度严重的区域,生态承载力水平低。(3)2010—2018年,宁都县开展规模化整地,使林地、荒地(未利用地)转为园地、耕地,增加了土地覆被度,加之降雨量减小,径流冲刷减弱,侵蚀模数大幅降低,分别减少了178.19,876.32,2 205.07 t/(km2·a),其他土地利用类型侵蚀模数变化较小,总体来看土壤侵蚀模数变化的主要原因是耕地、园地和未利用地的转化。[结论]宁都县不同土地利用方式下土壤侵蚀强度不同,且对区域承载力有较大影响,未来应加强人类活动对侵蚀及生态承载力的影响研究。
- Abstract:
- [Objective] In order to explore the spatiotemporal evolution and correlation of soil erosion and ecological carrying capacity in the context of land type changes, it is of great significance to improve the level of ecological carrying capacity, optimize land use structure and configure soil and water conservation measures. [Methods] This paper takes Ningdu County, Jiangxi Province as the research area, based on natural resource and socio-economic data, uses InVEST model and spatial principal component method to analyze the impact of soil erosion changes on ecological carrying capacity. [Results](1)The main types of land use in Ningdu County were forest land, arable land and grassland. The degree of soil erosion in the past 9 years showed the order: 597.42 t/(km2·a)in 2010>591.29 t/(km2·a)in 2015>583.51 t/(km2·a)in 2018. The type of erosion was predominantly slight. In areas such as the central, northwestern and southeastern regions, the degree of soil erosion on construction land and cultivated land was serious.(2)Ningdu County's ecological carrying capacity was low in the southwest and high in the northeast. In the past 9 years, the ecological carrying capacity had improved slightly. In areas with severe soil erosion in the third stage, the level of ecological carrying capacity was low.(3)From 2010 to 2018, Ningdu County had carried out large-scale land preparation, converting forest land and wasteland(unused land)into garden land and cultivated land, increasing the land cover. Coupled with the decrease in rainfall, the runoff erosion was weakened, and the erosion modulus significantly reduced, which reduced by 178.19 t/(km2·a), 876.32 t/(km2·a), and 2 205.07 t/(km2·a), respectively. Other land use types had less variation in erosion modulus. In general, the main reason for the change in soil erosion modulus was the conversion of arable land, garden land and unused land. [Conclusion] Soil erosion intensity varies under different land use methods in Ningdu County and has a large impact on the regional carrying capacity. Future research on the impact of human activities on erosion as well as ecological carrying capacity should be strengthened.
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备注/Memo
收稿日期:2022-06-24 修回日期:2022-07-13
资助项目:国家自然科学基金(42077066); 国家重点研发计划课题(2017YFC0505405)
第一作者:澹腾辉(1997—),男,河南商丘人,硕士研究生,研究方向为水土保持与GIS空间分析。E-mail:2277612833@qq.com
通信作者:郭忠录(1980—),男,山西忻州人,博士,教授,主要从事土壤侵蚀与水土保持研究。E-mail:zlguohzau@163.com