| 土地利用变化背景下沂河流域生态系统服务价值时空格局演化 |
| 摘要点击 2405 全文点击 435 投稿时间：2023-07-27 修订日期：2023-10-31 |
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| 中文关键词 土地利用变化 生态系统服务价值（ESV） 冷热点分析 地形梯度 沂河流域 |
| 英文关键词 land use change ecosystem service value（ESV） cold and hot spot analysis topographic gradient Yihe River Basin |
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| 中文摘要 |
| 在土地利用变化背景下,运用修正后的当量因子法核算沂河流域1975~2020年长时间序列生态系统服务价值（ESV）,引入冷热点分析和地形位分析方法探讨其水平空间和垂直空间格局特征.结果表明：①1975~2020年,沂河流域土地利用类型以耕地为主,土地利用变化突出表现为耕地的迅速减少与建设用地持续扩张,林地和草地面积略有上升,水域面积呈收缩状态,未利用地面积变化不大；②修正后的当量因子法更适用于核算沂河流域的ESV；1975~2020年,流域ESV整体呈螺旋上升趋势（333.69~338.16亿元）,以调节服务为主；耕地ESV最高且呈降低趋势,未利用地ESV最低；③在水平空间格局上,山地与水库附近为ESV热区,城区附近为ESV冷区；在垂直空间格局上,随着地形位梯度的上升,各土地利用类型ESV的垂直变化均呈先上升后下降趋势.研究结果揭示了土地利用变化背景下沂河流域生态系统服务价值的时空格局,可为优化土地利用结构和空间格局、提升生态系统服务提供科学依据. |
| 英文摘要 |
| In this study, the modified equivalent factor method was applied to account for the long time series ecosystem service value （ESV） of the Yihe River Basin from 1975 to 2020 in the context of land use change, and the cold hot spot analysis and topographic position analysis methods were introduced to explore the characteristics of its spatial pattern. The results showed that： ① From 1975 to 2020, the land use type of the Yihe River Basin was dominated by arable land, and the land use changes were characterized by the rapid decrease of arable land and the continuous expansion of construction land, a slight increase in the area of forest land and grassland, a contraction of the water body area, and little change in the area of unused land. ② The modified equivalent factor method was more suitable for accounting for the ESV in the basin. From 1975 to 2020, the overall ESV of the basin showed an upward spiral trend （33.369-33.816 billion CNY）, dominated by the regulating services. The ESV of arable land was the highest with a decreasing trend, whereas the ESV of unused land was the lowest. ③ In the horizontal spatial pattern, the hot spot of ESV was near mountains and reservoirs, and the cold spot of ESV was near urban areas. In terms of vertical spatial patterns, with growing topographic gradient, vertical changes in ESV for all land use types showed an increasing trend followed by a decreasing trend. The results of the study revealed the spatial and temporal patterns of ecosystem service values in the Yihe River Basin in the context of land use change and provide a scientific basis for optimizing the land use structure and spatial pattern and enhancing ecosystem services. |
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