GEOGRAPHICAL RESEARCH ›› 2019, Vol. 38 ›› Issue (6): 1527-1541.doi: 10.11821/dlyj020180235

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Effects of landscape spatial heterogeneity on surface water quality service: A case study in Yihe River basin, Henan province

Lyuyi LIU1,2,3(), Shengyan DING1,2(), Jiayan REN1,2,4, Ziqi BIAN1,2   

  1. 1. Key Laboratory of Geospatial Technology for the Middle and Lower Yellow River Regions, Henan University, Ministry of Education, Kaifeng 475004, Henan, China
    2. College of Environment and Planning, Henan University, Kaifeng 475004, Henan, China
    3. College of Forestry, Henan Agricultural University, Zhengzhou 450002, China
    4. School of Environment, Beijing Normal University, Beijing 100875, China
  • Received:2018-03-12 Revised:2018-07-08 Online:2019-06-20 Published:2019-06-12

Abstract:

Human disturbance frequently and strongly works on landscape, which causes sharp change of landscape spatial heterogeneity, and then seriously influences ecosystem services. Currently, research on the correlation between landscape spatial heterogeneity and ecosystem services is still weak. Issues such as how landscape spatial heterogeneity affects ecosystem services, and what contributions it makes to sustain ecosystem services have to be solved urgently. This article chooses the Yihe River basin as a study area, and surface water quality service as the object. Concentrations of chemical oxygen demand, ammonia nitrogen and total phosphorus are selected and calculated to represent surface water quality, and the spatial distribution of surface water quality was analyzed. Buffer zones with 5 different lengths of radius were built around each of the 20 sampling sites to analyze the characteristics of landscape spatial heterogeneity at different scales. Correlation analysis was carried out to discuss the influencing rules and responding mechanisms between landscape spatial heterogeneity and surface water quality service. Results show that: (1) Surface water quality in the Yihe River basin is generally good, but in the southwest and northeast parts around urban areas, surface water quality is relatively poor. (2) Different landscape composition types affect surface water quality differently. From the aspect of landscape composition, it can be seen that if the area proportion or patch number of forest is increasing, surface water quality would improve simultaneously. (3) At the class level, there is a significant correlation between landscape configuration of forest and the concentration of chemical oxygen demand (P<0.05) within 200 m radius buffer zones, while the landscape configuration of urban areas would influence surface water more significantly within 2000 m radius buffer zones. (4) At the landscape level, the concentration of total phosphorus is strongly influenced by landscape configuration change (P<0.05), when landscape configurational heterogeneity is lower, the concentration of total phosphorus would be higher. (5) Increasing landscape spatial heterogeneity appropriately can effectively reduce the concentration of surface water pollutant and ensure the sustainability of surface water quality service. This study provides a scientific foundation for the spatial development and policy making for aquatic environmental protection in the Yihe River basin.

Key words: landscape spatial heterogeneity, ecosystem services, surface water quality, landscape index, Yihe River basin