Dissolved Organic Carbon in Association with Water Soluble Nutrients and Metals in Soils from Lake Okeechobee Watershed, South Florida

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• 作者：Y. G. Yang (12)
  Z. L. He (1) zhe@ufl.edu
  Y. B. Wang (1)
  Y. L. Liu (1)
  Z. B. Liang (1)
  J. H. Fan (1)
  P. J. Stoffella (1)
• 关键词：Land use &#8211 ; Water ; extractable C/N &#8211 ; Water ; extractable C/P &#8211 ; Correlations
• 刊名：Water, Air, and Soil Pollution
• 出版年：2012
• 出版时间：September 2012
• 年：2012
• 卷：223
• 期：7
• 页码：4075-4088
• 全文大小：564.4 KB
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• 作者单位：1. IFAS, Indian River Research and Education Center, University of Florida, 2199 South Rock Road, Fort Pierce, FL 34945, USA2. Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550002 China
• ISSN：1573-2932

文摘

Water quality of Lake Okeechobee has been a major environmental concern for many years. Transport of dissolved organic matter (DOM) in runoff water from watershed is critical to the increased inputs of nutrients (N and P) and metals (Cu and Zn). In this study, 124 soil samples were collected with varying soil types, land uses, and soil depths in Lake Okeechobee watershed and analyzed for water-extractable C, N, P, and metals to examine the relationship between dissolved organic carbon (DOC) and water soluble nutrients (N and P) and metals in the soils. DOC in the soils was in 27.64&#8211;400 mg kg−1 (69.30 mg kg−1 in average) and varied with soil types, land uses, and soil depth. The highest water-extractable DOC was found in soils collected in sugar cane and field crops (277 and 244 mg kg−1 in average, respectively). Water soluble concentrations of N and P were in the range of 6.46&#8211;129 and 0.02&#8211;60.79 mg kg−1, respectively. The ratios of water-extractable C/N and C/P in soils were in 0.68&#8211;12.52 (3.23 in average) and 3.19&#8211;2,329 (216 in average), and varied with land uses. The lowest water-extractable C/N was observed in the soils from dairy (1.66), resident (1.79), and coniferous forest (4.49), whereas the lowest water-extractable C/P was with the land uses of dairy (13.1) and citrus (33.7). Therefore, N and P in the soils under these land uses may have high availability and leaching potential. The concentrations of water soluble Co, Cr, Cu, Ni, and Zn were in the ranges of < method detection limit (MDL)&#8211;0.33, <MDL&#8211;0.53, 0.04&#8211;2.42, <MDL&#8211;0.71, and 0.09&#8211;1.13 mg kg−1, with corresponding mean values of 0.02, 0.01, 0.50, 0.07, and 0.37 mg kg−1, respectively. The highest water soluble Co (0.10 mg kg−1), Cr (0.26 mg kg−1), Ni (0.31 mg kg−1), and Zn (0.80 mg kg−1) were observed in soils under the land use of sugar cane, whereas the highest Cu (1.50 mg kg−1) was with field crop. The concentration of DOC was positively correlated with total organic carbon (TOC) (P <0.01), water soluble N (P <0.01), electrical conductivity (EC, P <0.01), and water soluble Co, Cr, Ni, and Zn (P <0.01), and Cu (P <0.05), whereas water soluble N was positively correlated with water soluble P, Cu, and Zn (P <0.01) in soils. These results indicate that the transport of DOC from land to water bodies may correlate with the loss of macro-nutrients (N, P), micro-nutrients (Cu, Zn, and Ni), and contaminants (Cr and Co) as well.