JOURNAL OF NATURAL RESOURCES ›› 2015, Vol. 30 ›› Issue (11): 1872-1884.doi: 10.11849/zrzyxb.2015.11.008

• Resource Evaluation • Previous Articles     Next Articles

Spatial and Temporal Variations of Water Resource Security Level in the Three Gorges Reservoir Area of Chongqing Based on Agricultural Non-Point Source Pollutant

ZHANG Guang-na1, SHAO Jing-an1, 2, WANG Jin-liang1   

  1. 1.College of Geographical Science, Chongqing Normal University, Chongqing 400047, China;
    2. Key Laboratory of Surface Process and Environment Remote Sensing in the Three Gorges Reservoir Area, Chongqing 400047, China
  • Received:2014-09-11 Revised:2015-06-15 Online:2015-11-14 Published:2015-11-14

Abstract:

Agricultural non-point source pollution (NPSP) is becoming an increasingly important eco-environmental problem, and it has become the major source of river basin pollution in China. It is difficult to control due to its dispersive and extensive characteristics. The Three Gorges Reservoir area is typical frangible ecotope. Therefore, water resource security is especially important. According to the investigation on the pollution sources of chemical fertilizer, organic manure, Crops straw, breeding, agriculture, dormitory sewage, dormitory wastes and soil erosion in the Three Gorges Reservoir Area (TGRA) of Chongqing, the Nemerow index was adopted to analyze the river basin water resource security level over the period 2005-2011. Spatial and temporal variations of water resource security level was analyzed by using geostatistical methods and Nemerow index based on theoretical data and monitoring data at the districts (counties) level. There were four major findings from the study. 1) From the judging the amount of water quality concentration in 2005, 2008 and 2011 in the TGRA of Chongqing, the concentration of TN, TP had exceeded the Surface Water Quality Standards III. 2) The results showed that the Nemerow index of theoretical data were 2.48, 2.51 and 2.88 in 2005, 2008 and 2011. Judging from the results of the spatial and temporal variations analysis of Nemerow index(theoretical data), with the completion of the reservoir water, the water resource security level of the hinterland and central of the TGRA (Chongqing section) has declined, whereas the metropolis’ core district of the end of the TGRA (Chongqing section) has improved. 3) The Nemerow index of monitoring data were 1.26, 1.38 and 2.14 in 2005, 2008 and 2011. The results of theoretical data and monitoring data showed that there was similarity in the spatial distribution. 4) The high coincidence was showed by comparing of the monitoring data and theoretical data in the TGRA of Chongqing.

CLC Number: 

  • X131.2