Zobrazeno 1 - 10
of 10
pro vyhledávání: '"Haejin Han"'
Publikováno v:
Biogeochemistry. 126:269-283
Riverine phosphorus (P) levels in headwaters are a worldwide concern for environmental management due to the sensitivity of freshwater ecosystems to phosphorus loads. Here, we evaluate P in the Huai River Basin of China, a watershed with one of the h
Publikováno v:
Sustainability, Vol 9, Iss 10, p 1764 (2017)
Sustainability; Volume 9; Issue 10; Pages: 1764
Sustainability; Volume 9; Issue 10; Pages: 1764
Anthropogenic pressures have exacerbated self-sustaining river services, and growing concerns over sustaining river system become global problematic issues that lead us to implement river restoration projects. Of those projects, governing diverse nee
Publikováno v:
Journal of Great Lakes Research. 38:289-298
Phosphorus (P) applied to croplands in excess of crop requirements has resulted in large-scale accumulation of P in soils worldwide, leading to freshwater eutrophication from river runoff that may extend well into the future. However, several studies
Autor:
Haejin Han, J. David Allan
Publikováno v:
Biogeochemistry. 109:175-187
By constructing nitrogen (N) budgets from 1880 to 2002 for watersheds that have undergone urbanization, intensive agricultural specialization or experienced minimal change, we document an uneven timeline of increase in anthropogenic N inputs. N loadi
Publikováno v:
Chemical Geology. 273:1-7
We have measured the stable nitrogen isotope values ( δ 15 N) in two sediment cores sampled 15 years apart (1988 and 2003) from the Eastern Basin of Lake Erie and compared them to the total phosphorus (TP) and biogenic silica (BSi) concentrations in
Publikováno v:
Biogeochemistry. 102:45-58
We estimated net anthropogenic phosphorus inputs (NAPI) to 18 Lake Michigan (LM) and 6 Lake Erie (LE) watersheds for 1974, 1978, 1982, 1987, and 1992. NAPI quantifies all anthropogenic inputs of P (fertilizer use, atmospheric deposition, and detergen
Publikováno v:
Environmental Science & Technology. 43:1916-1922
River export of nitrogen (N) is influenced strongly by spatial variation in anthropogenic N inputs and climatic variation. We developed a model of riverine N export for 18 Lake Michigan Basin watersheds based on N budgets at 5-year intervals from 197
Autor:
J. David Allan, Haejin Han
Publikováno v:
Biogeochemistry. 91:177-199
Catchment nitrogen (N) budgets are a valuable tool to assess relative magnitude of N inputs and predict losses via riverine export. However, a range of computational approaches may be chosen, potentially affecting the modeled relationship between inp
Publikováno v:
Environmental Science & Technology. 3/15/2009, Vol. 43 Issue 6, p1916-1922. 7p.
Autor:
Nate S. Bosch, Hongyan Zhang, Edward S. Rutherford, Stephen B. Brandt, Stuart A. Ludsin, J. David Allan, Yuntao Zhou, Steven M. Bartell, Tomas O. Höök, Haejin Han, David J. Schwab, Dmitry Beletsky, Ruth D. Briland, Joseph V. DePinto, Timothy M. Sesterhenn, David M. Dolan, Daisuke Goto, Mary Anne Evans, Donald Scavia, Irem Daloğlu, Roger L. Knight, Doran M. Mason, James J. Roberts, Kristin K. Arend, R. Peter Richards, Troy M. Farmer, Daniel K. Rucinski, Anna M. Michalak
Publikováno v:
Journal of Great Lakes Research. (2):226-246
Relieving phosphorus loading is a key management tool for controlling Lake Erie eutrophication. During the 1960s and 1970s, increased phosphorus inputs degraded water quality and reduced central basin hypolimnetic oxygen levels which, in turn, elimin