南四湖流域近45 a水质净化服务功能的时空演变及其影响因素

doi:10.19741/j.issn.1673-4831.2022.0218

摘要/Abstract

摘要： 研究区域生态系统的水质净化服务功能的时空变化趋势及其驱动因素可以更加有效地保护流域水环境和合理开展土地利用规划。以南四湖流域1975-2020年9期土地利用数据为基础,以流域氮、磷输出负荷表征水质净化服务功能,运用InVEST-Nutrient Delivery Ratio(NDR) 模型模拟流域1975-2020年水质净化服务功能的时间变化趋势,并利用GIS 空间统计分析、景观格局分析和地理探测器等探讨土地利用、景观格局和其他自然和社会经济因素对水质净化服务功能的影响。结果表明,1975-2020年近45 a中南四湖流域氮、磷输出量呈先增加后减少再增加趋势;空间上,2020年流域西部平原地区氮、磷输出量较高,流域北部次之,流域东南部最低;相关分析表明,林地、草地对流域氮、磷输出起拦截阻滞作用,建设用地则对流域氮、磷输出起促进作用;景观格局指数分析表明,平均形状指数(SHAPE_MN)、平均相似度指数(SIMI_MN)、斑块结合度(COHESION)、蔓延度指数(CONTAG)和景观形状指数(LSI)等景观指数对氮、磷输出起促进作用,散布与并列指数(IJI)、平均聚集指数(CONTIG_MN)和平均核心斑块指数(CAI_MN)等则对氮、磷输出起阻滞作用。地理探测器分析表明,建设用地是水质净化服务功能的主要控制因素。

关键词: InVEST-NDR模型, 土地利用, 景观格局, 南四湖流域, 地理探测器, 水质净化服务功能

Abstract: Dynamics of water purification services function and their driving forces are of great importance to aquatic environment protection and land use planning. Therefore the dynamics of the total nitrogen and phosphorus output combined with the InVEST-Nutrient Delivery Ratio (NDR) Model and ArcGIS software based on the land use data of Nansihu Lake Basin during 1975-2020 was analyzed, and the output loads of nitrogen and phosphorus in the basin were the proxies of water purification service function. The driving forces of water purification service function, including land use, landscape pattern indices and other physical and social factors, were analyzed by ArcGIS 10.2 and Fragstats 4.2. The results show that the total nitrogen and total phosphorus output in Nansihu Lake Basin increased first, then decreased, and increased again, which suggested an increasing trend during the period of 1975-2020. In terms of spatial distribution pattern, the output of nitrogen and phosphorus was high in the western plain, followed by the northern part, and lowest in the southeastern part. The correlation analysis suggests that forest and grassland intercepted the output of nitrogen and phosphorus while construction land promoted their output. Some landscape pattern indices, included SHAPE_MN, SIMI_MN, COHESION, CONTAG and LSI could accelerate the output of nitrogen and phosphorus, while other indices including CONTIG_MN, CAI_MN and IJI could prevent the output of nitrogen and phosphorus. The analysis of Geodetector indicates that the proportion of construction land in the basin is the main controlling factor to the output of nitrogen and phosphorus.

Key words: InVEST-NDR model, land use, landscape pattern, Nansihu Lake Basin, Geodetector, water purification services function

中图分类号:

S157.2

叶敦雨, 孙小银, 单瑞峰. 南四湖流域近45 a水质净化服务功能的时空演变及其影响因素[J]. 生态与农村环境学报, 2023, 39(8): 990-998.

YE Dun-yu, SUN Xiao-yin, SHAN Rui-feng. Study on the Spatio-temporal Changes of Water Purification Service Function and its Influencing Factors of Nansihu Lake Basin for 45 Years[J]. Journal of Ecology and Rural Environment, 2023, 39(8): 990-998.

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