尺度整合视角下伊犁河谷地区生态安全格局构建——以昭苏县为例

Construction of ecological security pattern in Ili River Valley from the perspective of scale integration:A case study of Zhaosu County

构建生态安全格局是一种协调区域生态保护与经济发展关系的有效途径。由于生态系统服务供需差异,不同等级的行政区在生态安全格局构建中出现了空间结构错位脱节的问题。从整合视角出发,尝试整合伊犁河谷地区州级和县级两级尺度构建昭苏县生态安全格局。首先基于生态系统服务评价确定生态源地,再构建综合阻力面并采用电路理论模型识别生态廊道。研究结果显示,整合州级和县级两级尺度昭苏县共确定了24个生态源地,面积2504.47km^(2),主要分布于昭苏中部盆地以及北部、南部山区,土地利用类型主要为耕地、草地和林地;识别生态廊道50条,总长度200.17km。与单一尺度下生态安全格局构建相比,整合不同尺度构建生态安全格局能显著改善区域生境破碎化的问题,提高区域景观连通性。本研究提供了一种整合不同尺度下生态安全格局构建的技术框架,研究结果可为伊犁河谷地区国土空间格局优化提供有效参考。

Construction of the ecological security pattern is an effective way to coordinate the relationship between regionally ecological protection and economic development.Due to the differences in the supply and demand of ecosystem services,different levels of administrative districts have the misalignment and disconnection of spatial structures in the construction of ecological security patterns.From an integration perspective,this study attempts to integrate the state and county scales in the Ili Valley region to construct an ecological security pattern for Zhaosu County.Firstly,the ecological source sites were identified based on ecosystem service evaluation,and the integrated resistance surfaces were constructed and ecological corridors were identified using circuit theory model.The results showed that a total of 24 ecological source sites with an area of 2504.47 km^(2)were identified in Zhaosu County,mainly in the central basin,northern and southern mountainous areas of Zhaosu.The land use types were mainly arable land,grassland and forest land.50 ecological corridors with a total length of 200.17 km were identified.Compared with the construction of ecological safety pattern at single scale,the integration of different scales can significantly improve the fragmentation of regional habitats and enhance regional landscape connectivity.This study provides a technical framework for integrating ecological safety patterns at different scales,and the results can provide an effective reference for optimizing the spatial pattern of the land in the Ili Valley.