RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2017, Vol. 26 >> Issue (06): 902-914.doi: 10.11870/cjlyzyyhj201706013

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CHARACTERISTICS OF NITROGEN AND PHOSPHORUS LOAD IN THE PAST THREE DECADES IN THE NORTHWEST OF TAIHU BASIN BASED ON THE SWAT MODEL

SHEN Yin-yin1,2,3, HU Lei-di4,5, JIANG Quan-liang1, JIANG Jun-wu1, WU Ya-lin1, HUANG Tao1,2,3, YANG Hao1, SONG Ting6, HUANG Chang-chun1,2,3,4   

  1. 1. Key Laboratory of Virtual Geographic Environment(Nanjing Normal University), Ministry of Education, Nanjing 210023, China;
    2. State Key Laboratory Cultivation Base of Geographical Environment Evolution(Jiangsu Province), Nanjing 210023, China;
    3. Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing 210023, China;
    4. Suzhou police key laboratory of geographic information, Nanjing Normal University, Nanjing 210023, China;
    5. Suzhou Public Security Bureau, Suzhou 215000, China;
    6. Wuxi city environmental monitoring center, Wuxi 214000, China
  • Received:2016-11-09 Revised:2017-02-14 Online:2017-06-20
  • Supported by:
    National Natural Science Foundation of China (41571324);National Science Fund for Distinguished Young Scholars (41503075);ChinaPostdoctoral Science Foundation (2015M581826)

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Abstract: With the rapid development of industry and transformation of agricultural production, the phenomenon of eutrophication in Taihu Basin is becoming more and more serious, which poses a great threat to the ecological environment in the basin. This paper used land use data of six periods and daily rainfall data from 1984 to 2013 as the main input variables in the model. According to the land use data, we divided the time interval into six time periods. With the SWAT model (the Soil and Water Assessment Tool which can simulate soil water sediment and nutrient) to simulate the nutrients export in the study area of these six different periods, we calculated nutrients export in the past three decades (1984–2013) in the northwest of Taihu Basin. According to the model results, we explored the relationship between nutrients export, rainfall, runoff and the land-use change. The data of runoff and water quality recorded by the Yixing water station from 2009 to 2013 was used to calibrate and validate the model. The coefficient of determination R2 of total nitrogen and total phosphorus in calibration period was 0.76 and 0.92, respectively. The Nash coefficient of total nitrogen and total phosphorus was 0.76 and 0.79, respectively. The coefficient of determination R2 in the validation period was 0.66 and 0.95 and the Nash coefficient was 0.6 and 0.54, respectively. The results suggest that nutrients export was significantly correlated with the amount of rainfall and runoff over time, which were mainly concentrated in May to August every year, and were low in November to February of next year. However, this correlation was not significant in the space. Nutrients export was closely related to land use types, and the main nutrients export in the study area was concentrated in urban lands and agricultural lands. Agricultural lands were the main source of nutrients in the study area, but the flux of nutrients export in urban lands was higher than that in agricultural lands. The types of land use in study area showed a pattern of wasteland > urban land > agricultural land > forest in terms of flux of nutrients export. The spatial distribution of nutrients export was also closely related to the spatial distribution of land use types. The export of nutrients in urban lands and agricultural lands was relatively higher than other land uses. This study will provide theoretical support and data base for the control and management of non-point source pollution in Taihu Basin.

Key words: Taihu Basin, nutrients, land use change, SWAT model

CLC Number: 

  • X524
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