| 引用本文: | 李威,吕思思,赵卫权.基于InVEST模型的水质净化服务时空分异研究[J].灌溉排水学报,0,():-. |
| liwei,lvsisi,zhaoweiquan.基于InVEST模型的水质净化服务时空分异研究[J].灌溉排水学报,0,():-. |
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| 摘要: |
| 【目的】对北盘江流域TN、TP输出进行时空动态模拟，分析流域水质净化功能时空变化及其影响因素，为北盘江流域水污染控制、水生态修复提供科学依据。【方法】在GIS技术支持下，基于InVEST模型生态服务水质净化模块，模拟北盘江流域2000年，2010年和2020年TN、TP流域输出空间分布。【结果】结果表明：北盘江流域2000年，2010年和2020年TN、TP输出总量变化不大，但在空间分布上差异明显，TN输出总量均在8000 t/年以上，20年以来总共减少了120.76 t；TP输出总量均在1200 t/年以上，20年以来总共减少了5.45 t，表明流域生态系统水质净化服务功能在20年来有逐渐变好的趋势。TN、TP高输出区域主要集中分布在北盘江流域上游和中游以及城镇区周边，低输出区域主要分布在下游地势平坦的区域。【结论】耕地施肥过程中未被吸收转化的N、P营养物质以及城镇区的生活生产污水是造成流域水质净化功能恶化的主要因素，也是流域非点源污染的重要来源。 |
| 关键词: 北盘江流域;水质净化;InVEST模型;时空分异 |
| DOI： |
| 分类号:X52 |
| 基金项目: |
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| Spatial-temporal Differentiation of Water Purification Services inBeipanjiang River Basin based on InVEST model |
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liwei, lvsisi, zhaoweiquan
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Guizhou Academy of Sciences
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| Abstract: |
| Abstract:【Background and objective】Water quality purification service plays an important role in ensuring water quality in the whole basin and has great significance to sustainable economic and social development healthy．This paper analyzed the temporal and spatial variation of water purification function and its influencing factors by dynamic simulation of TN and TP output in Beipanjiang River Basin, so as to provide scientific basis for water pollution control and water ecological restoration measures.【Method】It modeled the spatial distribution of TN and TP output in 2000, 2010 and 2020 with the support of GIS technology and based on InVEST model ecological service water quality purification module.【Result】The results show that the total output of TN and TP in 2000, 2010 and 2020 has little change, but there are significant differences in spatial distribution.both the minimum and maximum values of TN output per unit area were distributed in 2010, which were 1.51 kg/hm2 and 5.21 kg/hm2, respectively, with a difference of more than 3 times; The total output of TN is more than 8000/t year, and decreased by 120.76t in the past 20 years. The total TP output is more than 1200/t year, with a total decrease of 5.45t in the past 20 years, indicating that the water purification service function of the watershed ecosystem has a gradual trend of improvement in the past 20 years. TN and TP high output areas are mainly distributed in the upper and middle reaches of Beipanjiang River basin and around urban areas, while low output areas are mainly distributed in flat areas of the lower reaches.【Conclusion】Excessive N and P nutrients that are not absorbed and transformed in the fertilization process of cultivated land, while the domestic and production sewage in urban areas are the main factors leading to the deterioration of water purification function in the basin, which are also the important source of non-point source pollution. In addition，the changes to the climate and land use were the main factors which led to the changes of water purification services in beipanjiang river basin． |
| Key words: Beipan River Basin; water quality purification; InVEST model; Spatial-Temporal Differentiation |
