Experimental snowpack reduction alters organic matter and net N mineralization potential of soil macroaggregates in a northern hardwood forest

2008 ◽  
Vol 45 (1) ◽  
pp. 1-10 ◽  
Author(s):  
J. Megan Steinweg ◽  
Melany C. Fisk ◽  
Benjamin McAlexander ◽  
Peter M. Groffman ◽  
Janet P. Hardy
Keyword(s):  
Organic Matter ◽  
N Mineralization ◽  
Hardwood Forest ◽  
Northern Hardwood Forest ◽  
Net N Mineralization ◽  
Northern Hardwood ◽  
Mineralization Potential ◽  
N Mineralization Potential

Influence of sampling date and substrate on nitrogen mineralization: comparison of laboratory-incubation and buried-bag methods for two Massachusetts forest soils

1992 ◽  
Vol 22 (12) ◽  
pp. 1895-1900 ◽  
Author(s):  
Richard D. Boone
Keyword(s):  
Organic Matter ◽  
N Mineralization ◽  
Unit Area ◽  
Seasonal Pattern ◽  
Mineral Soil ◽  
Net N Mineralization ◽  
Laboratory Incubation ◽  
Mineralization Potential ◽  
Organic Horizons ◽  
N Mineralization Potential

Nitrogen (N) mineralization potential and net N mineralization insitu were measured monthly over 7 months for the forest floor horizons (Oi, Oe, Oa) and mineral soil (0–15 cm) of a pine stand and the mineral soil (0–15 cm) of a maple stand in Massachusetts, United States. In all cases, N mineralization potential per unit organic matter (anaerobic laboratory incubation) varied significantly by sampling month but was unrelated to the seasonal pattern for net N mineralization (buried-bag method). The organic horizons in the pine stand exhibited the most variable N mineralization potential, with the Oe horizon having more than a fourfold seasonal range. For the pine stand the Oe horizon also had the highest N mineralization potential (per unit organic matter) and the highest net N mineralization insitu (per unit area). In general, temporal and depth-wise variability should be considered when sites are assessed with respect to the pool of mineralizable N.

Contribution of atmospheric nitrogen deposition to net primary productivity in a northern hardwood forest

2009 ◽  
Vol 39 (6) ◽  
pp. 1108-1118 ◽  
Author(s):  
Lucas E. Nave ◽  
Christoph S. Vogel ◽  
Christopher M. Gough ◽  
Peter S. Curtis
Keyword(s):  
Primary Productivity ◽  
N Mineralization ◽  
Net Primary Productivity ◽  
Hardwood Forest ◽  
Organic N ◽  
Northern Hardwood Forest ◽  
Net N Mineralization ◽  
Northern Hardwood ◽  
N Supply ◽  
N Requirement

Net primary productivity (NPP) in northern temperate forests is an important part of the global carbon cycle. Because NPP often is limited by nitrogen (N), atmospheric N deposition (Ndep) may increase forest NPP. At a northern hardwood forest site in northern Lower Michigan, USA, we quantified rates of N supply by Ndep, canopy retention of Ndep (Ncr), and soil net N mineralization (Nmin); calculated the N requirement of NPP; and estimated the fraction of NPP that could be attributed to atmospheric N inputs. Net N mineralization supplied 42.6 kg N·ha–1·year–1 (84% of the NPP N requirement), and Ndep averaged 7.5 kg N·ha–1·year–1 (15%). The forest canopy retained 38% of Ndep (Ncr = 2.8 kg N·ha–1·year–1), primarily in the forms of organic N and NH4-N. Fine root (62%) and leaf (31%) N requirements dominated the NPP N requirement of 50.7 kg N·ha–1·year–1. Annual N supply by the processes we measured agreed very closely with the NPP N requirement, suggesting that internally cycled N and N of atmospheric origin contribute to the N nutrition of this forest. Our results indicate that up to 15% of the NPP at this site may be driven by atmospheric N inputs.

scholarly journals Effects of calcium silicate treatment on the composition of forest floor organic matter in a northern hardwood forest stand

2014 ◽  
Vol 122 (2-3) ◽  
pp. 313-326 ◽  
Author(s):  
Ankit Balaria ◽  
Chris E. Johnson ◽  
Peter M. Groffman ◽  
Melany C. Fisk
Keyword(s):  
Organic Matter ◽  
Calcium Silicate ◽  
Forest Floor ◽  
Forest Stand ◽  
Hardwood Forest ◽  
Northern Hardwood Forest ◽  
Northern Hardwood

Nitrogen mineralization in soil from perennial grassland measured through long-term laboratory incubations

2002 ◽  
Vol 138 (3) ◽  
pp. 301-310 ◽  
Author(s):  
A. COLLINS ◽  
D. W. ALLINSON
Keyword(s):  
Organic Matter ◽  
Nitrogen Mineralization ◽  
N Mineralization ◽  
Fertilizer Application ◽  
Soil Samples ◽  
N Fertilizer ◽  
Mineralization Potential ◽  
Perennial Grassland ◽  
N Mineralization Potential

Under perennial grasslands, nitrogen contained in organic matter becomes available at varying rates via mineralization throughout the growing season. The amount of N present at any given time indicates only the quantity immediately present, and does not include N which has already been removed either by leaching or uptake into the plant system, nor the N which will become available as organic matter breaks down over time. Long-term aerobic laboratory incubation methods have been used successfully to estimate potential N mineralization under various cropping conditions. They had not been used successfully, however, to estimate potential N availability under perennial grassland.In this research, soil samples from two long-term perennial grassland sites were taken before and after N fertilizer application at rates of 0, 175, 350 and 525 kg/ha. The soils were incubated in the laboratory at 35 °C and were eluted at 2, 4, 8, 12, 16, 22 and 30-week intervals, the length of time prescribed for determining N mineralization potential. Because a plateau had not been reached, incubation was allowed to continue for 198 weeks and 148 weeks for the pre- and post-N samples, respectively. Total N was high, as was soil organic matter in both sets of soil samples. Nitrogen mineralization potential was underestimated after 30 weeks of incubation, and overestimated after 148 weeks. The closest agreement between N measured and the estimated N mineralization potential, came after 198 weeks of incubation. This study confirmed the high N-supplying capacity of soil under long-term perennial grasslands. It also indicated that the recommended 30-week period needed to estimate N mineralization potential under other cropping systems was insufficient for a perennial grassland soil. Cumulative differences in N mineralization were found with varying rates of N fertilizer application, but these differences were rarely seen on an individual weekly basis, nor were they significant at the termination of the experiment. The response to N application differed by site.

Controls on soil organic matter content within a northern hardwood forest

Geoderma ◽  
2009 ◽  
Vol 148 (3-4) ◽  
pp. 346-356 ◽  
Author(s):  
Kristofer D. Johnson ◽  
Frederick N. Scatena ◽  
Arthur H. Johnson ◽  
Yude Pan
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Organic Matter Content ◽  
Matter Content ◽  
Hardwood Forest ◽  
Northern Hardwood Forest ◽  
Soil Organic Matter Content ◽  
Northern Hardwood

Transport of Carbon and Nitrogen Between Litter and Soil Organic Matter in a Northern Hardwood Forest

Ecosystems ◽  
2011 ◽  
Vol 14 (2) ◽  
pp. 326-340 ◽  
Author(s):  
Timothy J. Fahey ◽  
Joseph B. Yavitt ◽  
Ruth E. Sherman ◽  
Peter M. Groffman ◽  
Melany C. Fisk ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Hardwood Forest ◽  
Northern Hardwood Forest ◽  
Carbon And Nitrogen ◽  
Northern Hardwood
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