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Full-Text Articles in Life Sciences
Are Rivers Just Bigstreams? Using A Pulse Method To Measure Nitrogen Demand In A Large River, J. L. Tank, E. J. Rosi-Marshall, Michelle A. Baker, R. O. Hall Jr.
Are Rivers Just Bigstreams? Using A Pulse Method To Measure Nitrogen Demand In A Large River, J. L. Tank, E. J. Rosi-Marshall, Michelle A. Baker, R. O. Hall Jr.
Biology Faculty Publications
Given recent focus on large rivers as conduits for excess nutrients to coastal zones, their role in processing and retaining nutrients has been overlooked and understudied. Empirical measurements of nutrient uptake in large rivers are lacking, despite a substantial body of knowledge on nutrient transport and removal in smaller streams. Researchers interested in nutrient transport by rivers (discharge >10000 L/s) are left to extrapolate riverine nutrient demand using a modeling framework or a mass balance approach. To begin to fill this knowledge gap, we present data using a pulse method to measure inorganic nitrogen. (N) transport and removal in the …
N-Transfer Through Aspen Litter And Feather Moss Layers After Fertilization With Ammonium Nitrate And Urea, N A. Startsev, V J. Lieffers, S M. Landhausser, A Velazquez-Martinez
N-Transfer Through Aspen Litter And Feather Moss Layers After Fertilization With Ammonium Nitrate And Urea, N A. Startsev, V J. Lieffers, S M. Landhausser, A Velazquez-Martinez
Aspen Bibliography
When fertilizer is broadcast in boreal forest stands, the applied nutrients must pass through a thick layer of either feather moss or leaf litter which covers the forest floor. In a growth chamber experiment we tested the transfer of N through living feather moss or aspen litter when fertilized with urea ((NH2)2CO) or NH4NO3 at a rate of 100 kg ha−1 and under different watering regimes. When these organic substrates were frequently watered to excess they allowed the highest transfer of nutrients through, although 72% of the applied fertilizer was captured in the substrates. In a field experiment we also …