| Dissolved organic matter in relation to nutrients (N and P) and heavy metals in surface runoff water as affected by temporal variation and land uses- A case study from Indian River Area, south Florida, USA | |
| Yuangen Yang; Zhenli He; Yanbo Wang; Jinghua Fan; Zhanbei Liang; Peter J. Stoffella | |
| 2013 | |
| Source Publication | Agricultural Water Management
 |
| Volume | 118Issue:1Pages:38-49 |
| Abstract | Transport of dissolved organic matter in runoff water plays a critical role in the increased inputs of nutrients (N and P) and metals (Fe, Cu and Zn) in water, and the deposition of muck sediments in the Saint Lucie Estuary and Indian River Lagoon, Florida. The objectives of this study were to investigate the variation of dissolved organic carbon (DOC) and dissolved nitrogen (DN) in surface runoff water with varying land uses, and to explore their possible relations with the leaching losses of nutrients N and P, and metals Fe, Cu, and Zn from different land uses. For this, surface runoff water from two major agricultural production systems (citrus grove and vegetable farm) in south Florida was collected weekly using pre-installed autosamplers during Jan. 2008-Mar. 2010. Meanwhile, runoff water from twelve field sites with varying land uses (such as ranch, golf course, and forest) was collected monthly using a grab sampler from Aug. 2008 to April, 2010, and soils were collected at the depth of 0-15 cm and 15-30 cm twice a year from autosampler-installed locations and on Nov. 25th, 2008 from grab sampling locations as well. In the field, water samples were measured for electrical conductivity, dissolved oxygen, and temperature; in the laboratory, water samples were analyzed for pH, total solids, turbidity, DOC, DN, total P (TP), and metals Cu, Fe and Zn with or without passing a 0.45 mu m filter membrane. After passing a 2 mm sieve, fresh soil samples were analyzed for moisture, pH, electrical conductivity, 0.5 M K2SO4 solution extractable DOC/DN, and Mehlich 3 extractable P, Fe, Cu, and Zn. Spatial and temporal variations in the concentrations of DOG and DN in runoff water were observed, with the greatest average concentrations of DOC and DN from ranch (similar to 28 and similar to 2.3 mg L-1) and the lowest from golf course (similar to 16 mg L-1) for DOC and from forest and nursery for DN (similar to 1.5-1.6 mg L-1), respectively. Temporal fluctuations of DOC and DN in runoff water from varying land uses were in good accord with rainfall intensity and frequency of rainfall. Temporal variations of TP and metals Fe, Cu, and Zn were influenced by climatic condition as well. Citrus grove exported greater amounts of DOC and DN in runoff water (27.6 and 3.51 mg L-1 of median value) than vegetable farms (13.8 and 2.26 mg L-1 of median value). Annual cumulative loads of DOC and total N in 2008, 2009 or 2010 were >20 kg ha(-1), greater than those of TP (<13.5 kg ha(-1)) and metals Fe, Cu, and Zn (<1.5 kg ha(-1)). Ranch soil had the highest extractable DOC concentration (>100 mg kg(-1)), accounting for 1% of its total organic carbon. Soil extractable DN had significant correlations with extractable P and Cu/Zn in soils. In conclusion, soil total organic carbon pool and its availability had an important effect on DOG and DN in runoff water. Land use type and rainfall event were the two influential factors affecting concentrations of DOC and DN, and the export of nutrients N and P. and metals in runoff water. |
| Keyword | Agricultural Fields Golf Course Ranch Dissolved Organic Carbon Water Flow Watershed |
| Indexed By | SCI |
| Language | 英语 |
| Document Type | 期刊论文 |
| Identifier | http://ir.gyig.ac.cn/handle/352002/5110 |
| Collection | 环境地球化学国家重点实验室_环境地球化学国家重点实验室_期刊论文 |
| Recommended Citation GB/T 7714 | Yuangen Yang,Zhenli He,Yanbo Wang,et al. Dissolved organic matter in relation to nutrients (N and P) and heavy metals in surface runoff water as affected by temporal variation and land uses- A case study from Indian River Area, south Florida, USA[J]. Agricultural Water Management,2013,118(1):38-49. |
| APA | Yuangen Yang,Zhenli He,Yanbo Wang,Jinghua Fan,Zhanbei Liang,&Peter J. Stoffella.(2013).Dissolved organic matter in relation to nutrients (N and P) and heavy metals in surface runoff water as affected by temporal variation and land uses- A case study from Indian River Area, south Florida, USA.Agricultural Water Management,118(1),38-49. |
| MLA | Yuangen Yang,et al."Dissolved organic matter in relation to nutrients (N and P) and heavy metals in surface runoff water as affected by temporal variation and land uses- A case study from Indian River Area, south Florida, USA".Agricultural Water Management 118.1(2013):38-49. |
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