Special Column:Celebration of the 70th Anniversary of IGSNRR, CAS

Nitrate Concentration in Water in Small Watersheds of Three Gorges Reservoir Area and Its Relationship with Land-use

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  • 1. College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China;
    2. Water and Soil Conservation Bureau of Zigui County, Hubei Province, Zigui 443600, China

Received date: 2007-12-27

  Revised date: 2008-03-31

  Online published: 2008-09-28

Abstract

This article mainly discusses the influence of land-use structure and fertilizer consumption on the nitrate concentration in water body in two small watersheds in Three Gorges Reservoir Area. By investigating the structure of land-use and the consumption of fertilizer and nitrate variability in three consecutive years, some conclusions are drawn that: (1) Distinguished discrepancies exist in nitrate concentration between the two watersheds. In Quxi Watershed, it fluctuates between 0.4 and 14.6 mg/l, and the average is 6.96mol/l; in Baotahe Watershed, it is between 0.2 and 6.8mol/l, and the average is 2.41mol/l. The ratio of arable land and forest land plays an important role on the nitrate concentration in water bodies of the watersheds. (2) Seasonal change of the nitrate concentration in Quxi Watershed is higher in winter, then autumn and summer, lower in spring, which may relate to the rainfall and seasonal agricultural activities. Due to the significant effect of the residents,non-agricultural activities, the nitrate concentration in Baotahe Watershed shows no seasonal change rule, the annual change is that it increased in 2005 and then decreased in 2006;and the effect of cultivation on the nitrate in Baotahe is weaker than that in Quxi.

Cite this article

LIU Ren-yan, FENG Ming-lei, LIN Shan, HU Rong-gui, JIANG Cheng, CHEN Xing-quan, XIAO Hong-yu . Nitrate Concentration in Water in Small Watersheds of Three Gorges Reservoir Area and Its Relationship with Land-use[J]. JOURNAL OF NATURAL RESOURCES, 2008 , 23(5) : 886 -892 . DOI: 10.11849/zrzyxb.2008.05.016

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