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Nitrogen Cycling In The Northern Hardwood Forest
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Book Synopsis Nitrogen Cycling in the Northern Hardwood Forest by : Lucas Emil Nave
Download or read book Nitrogen Cycling in the Northern Hardwood Forest written by Lucas Emil Nave and published by . This book was released on 2007 with total page 89 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Nitrogen (N) is the nutrient most limiting to plant growth (NPP) in temperate forests. In N-limited temperate forests, most of the N required for NPP is recycled between soil and plant N pools by the microbial process of N-mineralization (Nmin). However, human activities have increased atmospheric N deposition (Ndep) to forests in the last 50-100 years, and this surplus N may increase NPP. But, forest responses to Ndep are not satisfactorily understood, and depend on how atmospheric N inputs are partitioned between soils and plants. From my field data collection at a mature forest site, I estimated that NPP required 51 kg N ha−1 yr−1, most of which was used for fine root and leaf production (62% and 31%, respectively). Each year, Nmin supplied 87% of Nreq, and Ndep contributed an additional 13%, 4% of which was due to canopy retention of Ndep (Ncr). Data from my mesocosm 15N-labelling experiment suggested that very little (10%) of Ncr observed in the field was actually taken up by trees, and the majority of Ndep (85%) was assimilated into soil pools. These results suggest that Ndep could not have significantly increased forest NPP at UMBS over the time scale of my studies. My greenhouse experiment corroborated this conclusion, with tree seedlings showing no significant increase in photosynthesis or growth in response to Ndep at ambient rates. However, Ndep to forest ecosystems has been occurring for decades in industrialized regions, and most of the N inputs have been incorporated into soil organic matter (SOM). Research across temperate forests has suggested that forests exposed to large N inputs over time exhibit decreased soil C/N ratios, which are associated with faster Nmin rates. Using meta-analysis, I verified this pattern in the literature, and discovered novel relationships between forest soil properties and their responses to N inputs. My results demonstrated a long-term, quantitative relationship between Ndep and Nmin, and suggest that NPP may increase in temperate forests affected by Ndep.
Book Synopsis Sensitivity Analysis of a Nitrogen Cycling Model for a Northern Hardwood Forest by : Jessica Frances Sheldon
Download or read book Sensitivity Analysis of a Nitrogen Cycling Model for a Northern Hardwood Forest written by Jessica Frances Sheldon and published by . This book was released on 2003 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Nitrogen Cycling and Nitrogen Saturation in Northern Hardwood Forest Ecosystems by : Linda Hildegarde Pardo
Download or read book Nitrogen Cycling and Nitrogen Saturation in Northern Hardwood Forest Ecosystems written by Linda Hildegarde Pardo and published by . This book was released on 1991 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Nitrogen Cycling in a Base-poor and a Relatively Base-rich Northern Hardwood Forest Ecosystem by : James Frederick Thorne
Download or read book Nitrogen Cycling in a Base-poor and a Relatively Base-rich Northern Hardwood Forest Ecosystem written by James Frederick Thorne and published by . This book was released on 1985 with total page 135 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Interactions Between Land-use History, Nitrogen Cycling, and Beech Bark Disease in Northern Hardwood Forests by : Erika Ford Latty
Download or read book Interactions Between Land-use History, Nitrogen Cycling, and Beech Bark Disease in Northern Hardwood Forests written by Erika Ford Latty and published by . This book was released on 2001 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Microbial Nitrogen Cycling Response to Calcium and Phosphorus in Northern Hardwood Forest Soils at the Hubbard Brook Experimental Forest, New Hampshire by : Kevan Joseph Minick
Download or read book Microbial Nitrogen Cycling Response to Calcium and Phosphorus in Northern Hardwood Forest Soils at the Hubbard Brook Experimental Forest, New Hampshire written by Kevan Joseph Minick and published by . This book was released on 2009 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt: Anthropogenic soil acidification appears to be detrimental to forest health in the northeastern US possibly due to reduced microbial activity influencing plant-available nutrients. In a recent study at the Hubbard Brook Experimental Forest, soil microbial activity was not stimulated by increased pH. Therefore, microbial response to increased pH may depend on the level of calcium added or availability of other nutrients. I tested the effects of Ca and phosphorus additions in the field on microbial nitrogen transformations. High Ca addition reduced net N mineralization. Low Ca addition did not affect N transformations, but the combination of Ca/P addition reduced net N mineralization. Phosphorus addition unexpectedly increased gross nitrification. Results from this study indicate that microbial mineralization is not sensitive to moderate differences in pH or limited by P. Therefore, detrimental effects of acidic deposition to these forests are not likely a result of nutrient deficiencies related to suppression of microbial activity.
Book Synopsis Nitrogen Dynamics Following Clear-cut Harvest of Northern Hardwood Ecosystems in Michigan by : William E. Holmes
Download or read book Nitrogen Dynamics Following Clear-cut Harvest of Northern Hardwood Ecosystems in Michigan written by William E. Holmes and published by . This book was released on 1997 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Influence of White-tailed Deer on Nitrogen Cycling and Vegetative Community Change in Canopy Gaps in a Hemlock-northern Hardwood Forest by : Betsy E. Tahtinen
Download or read book Influence of White-tailed Deer on Nitrogen Cycling and Vegetative Community Change in Canopy Gaps in a Hemlock-northern Hardwood Forest written by Betsy E. Tahtinen and published by . This book was released on 2012 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Biogeochemistry of Moose and Soil Freezing by : Lynn Christenson (M.)
Download or read book The Biogeochemistry of Moose and Soil Freezing written by Lynn Christenson (M.) and published by . This book was released on 2007 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Municipal Wastewater Effects on Nitrogen Cycling in a Mature Hardwood Forest by : Dong Yeob Kim
Download or read book Municipal Wastewater Effects on Nitrogen Cycling in a Mature Hardwood Forest written by Dong Yeob Kim and published by . This book was released on 1992 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Microbial Activity in Deeper Mineral Soil Important for Nitrogen Cycling Across Successional Stand Age in a Northern Hardwood Forest by : Bridget Anna Darby
Download or read book Microbial Activity in Deeper Mineral Soil Important for Nitrogen Cycling Across Successional Stand Age in a Northern Hardwood Forest written by Bridget Anna Darby and published by . This book was released on 2016 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: Little is known about soil processes with depth, as the majority of studies measuring soil nitrogen (N) cycling and microbial activity only measure the top 10-15 cm, where activity is expected to be highest. Microbes play an important role in the extraction of N from the mineral soil through the mineralization of organic N and in the accumulation of N in the mineral soil through immobilization and turnover of N in microbial biomass or in extracellular enzymes. It is also uncertain how these processes vary with successional stand age. To understand how N cycling varies with depth and forest stand age, we measured gross and net N mineralization and nitrification rates, as well as extracellular enzyme activity to 50 cm depth across three sites varying in stand age (45 and 100 years post-harvest and old growth) at and near Hubbard Brook Experimental Forest in central New Hampshire. N- and C- degrading enzyme activity correlated with gross N mineralization rates, but not net N mineralization rate, directly linking microbial activity to the release of N from SOM. Enzyme activity and N cycling rates were expected to decrease with depth in response to decreasing soil C and N concentrations and increasing organic matter age. We found that N cycling rates per g dry soil and g N did decrease with between the forest floor and mineral soil, but decomposition enzyme activity and remained constant relative to decreasing organic matter concentrations with depth. On an areal basis, N cycling in the mineral soil was much larger, flux than in the organic horizon due to the large mass of the mineral soil. We found few differences in activity rates across sites, though net nitrification was significantly higher at the old growth site and enzyme activities were often lower at the 100 year old stand as compared the other two sites. The results from our study demonstrate the underappreciated importance of microbial activity with depth. Although N cycling rates decreased with depth, N turnover remained relatively high throughout the soil profile, highlighting the availability of N in old SOM and the likely importance of deep soil in supplying N to plants and microbes.
Author :Ernst-Detlef Schulze Publisher :Springer Science & Business Media ISBN 13 :9783540670254 Total Pages :540 pages Book Rating :4.6/5 (72 download)
Book Synopsis Carbon and Nitrogen Cycling in European Forest Ecosystems by : Ernst-Detlef Schulze
Download or read book Carbon and Nitrogen Cycling in European Forest Ecosystems written by Ernst-Detlef Schulze and published by Springer Science & Business Media. This book was released on 2000 with total page 540 pages. Available in PDF, EPUB and Kindle. Book excerpt: Accompanying CD-ROM "provides a complete database of all flux, storage and species observations for modellers."--Page 4 of cover.
Book Synopsis Nitrogen Loss from Northern Hardwood Forests Five Years Following Clear-cut Harvest by : Thomas M. Iseman
Download or read book Nitrogen Loss from Northern Hardwood Forests Five Years Following Clear-cut Harvest written by Thomas M. Iseman and published by . This book was released on 1997 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis New Perspectives on Nitrogen Cycling in the Temperate and Tropical Americas by : Alan R. Townsend
Download or read book New Perspectives on Nitrogen Cycling in the Temperate and Tropical Americas written by Alan R. Townsend and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 295 pages. Available in PDF, EPUB and Kindle. Book excerpt: Inputs of nitrogen to terrestrial and aquatic ecosystems have increased several-fold over the last one hundred and fifty years, with the steepest increases during the last four decades. The expansion of fertilizer manu facture and use, the increase in fossil fuel combustion, the intensification of animal husbandry, and widespread cultivation of N2 fixing crops have all contributed to the dramatic increase in N inputs. The increase has been most rapid in Northern Hemisphere (NH) temperate ecosystems, but presently subtropical and tropical regions of Asia are also experiencing an explosive increase in N inputs to terrestrial ecosystems (W. Chameides, pers. comm. ; Galloway et al. 1996). Projected increases in N deposition for these trop ical and subtropical regions, with a high natural background of N inputs, exceed increases projected for temperate and arctic regions (Cleveland et al. submitted; Galloway et al. 1994; Holland & Lamarque 1997a). Compared to biological N fixation, N deposition is becoming a proportionately greater source of N to terrestrial and aquatic ecosystems worldwide (Vitousek et al. 1997). 6 The nitrogen contained in the atmosphere as N , 3. 9 * 10 Tg (Tg = 2 12 10 g), is the largest reservoir of N in the Earth system (Warneck 1988). However, this paper focuses on the nitrogen emissions and deposition that have been transformed from N2 into reactive forms that are biologically avail able (e. g. Vitousek et al. 1997).
Book Synopsis Seasonal Patterns of Microbial, Biomass and Nitrogen Mineralization in Northern Hardwood Forests by : William E. Holmes
Download or read book Seasonal Patterns of Microbial, Biomass and Nitrogen Mineralization in Northern Hardwood Forests written by William E. Holmes and published by . This book was released on 1993 with total page 53 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Plant and Microbial Mechanisms of Nitrogen Retention in Northern Hardwood Forests Receiving Atmospheric NO3 Deposition by : William C. Eddy
Download or read book Plant and Microbial Mechanisms of Nitrogen Retention in Northern Hardwood Forests Receiving Atmospheric NO3 Deposition written by William C. Eddy and published by . This book was released on 2006 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Landscape Patterns of Intraecosystem Nitrogen Cycling by : Donald R. Zak
Download or read book Landscape Patterns of Intraecosystem Nitrogen Cycling written by Donald R. Zak and published by . This book was released on 1987 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt:
