Chapter 7 The Nitrogen Cycle © 2013 Elsevier, Inc. All rights reserved. From Fundamentals of Ecosystem Science, Weathers, Strayer, and Likens (eds).

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Chapter 7 The Nitrogen Cycle © 2013 Elsevier, Inc. All rights reserved. From Fundamentals of Ecosystem Science, Weathers, Strayer, and Likens (eds).

Figure 7.1 The time course of selected human actions that have effects at the global scale. Note that human manipulation of the global N cycle has been the most recent and drastic component of global change. (FromVitousek et al ) © 2013 Elsevier, Inc. All rights reserved. From Fundamentals of Ecosystem Science, Weathers, Strayer, and Likens (eds).

Figure 7.2 Global nitrogen budget for 1860 and mid-1990s. Data in Tg N/yr. The emissions to the NOy box from the coal reflect fossil-fuel combustion. Those from the vegetation include agricultural and natural soil emissions, and combustion of biofuel, biomass (savannah and forests), and agricultural waste. The emissions to the NH x box from the agricultural field include emissions from agricultural land and combustion of biofuel, biomass (savannah and forests), and agricultural waste. The NH x emissions from the cow and feedlot reflect emissions from animal waste. (From Galloway and Cowling 2002.) © 2013 Elsevier, Inc. All rights reserved. From Fundamentals of Ecosystem Science, Weathers, Strayer, and Likens (eds).

Figure 7.3 The nitrogen cascade. Nitrogen added to the environment by human activity “cascades” through the atmosphere and terrestrial and aquatic ecosystems causing a series of air- and water-quality problems. (From Galloway 2003.) © 2013 Elsevier, Inc. All rights reserved. From Fundamentals of Ecosystem Science, Weathers, Strayer, and Likens (eds).

Figure 7.4 The N cycle. Each process indicated in the figure is discussed in the text. © 2013 Elsevier, Inc. All rights reserved. From Fundamentals of Ecosystem Science, Weathers, Strayer, and Likens (eds).

Figure 7.5 The N cycle in the water column and sediment layers of a thermally stratified aquatic ecosystem such as a lake. © 2013 Elsevier, Inc. All rights reserved. From Fundamentals of Ecosystem Science, Weathers, Strayer, and Likens (eds).

Figure 7.6 The watershed-scale mass balance of nitrogen at Hubbard Brook Experimental Forest Watershed 6 (New Hampshire) is shown for a 37-year period. This northern hardwood forest was aggrading (building up) biomass until about During the aggrading period, there were “missing inputs” to support the large accumulation in biomass, and in the nonaggrading period, there were “missing outputs” as stream output, which is measured very accurately at Hubbard Brook, and is much lower than atmospheric input. These missing outputs must be either to gases or accumulation in soil organic matter. (From Yanai, R.D., S.P. Hamburg, M.A. Arthur, M.A. Vadeboncoeur, C.B. Fuss, and T.G. Siccama, unpublished.) © 2013 Elsevier, Inc. All rights reserved. From Fundamentals of Ecosystem Science, Weathers, Strayer, and Likens (eds).

Figure 7.7 Conceptual model showing how site characteristics (geomorphology, soil texture, and depth) influence water availability, which in turn influences litter quality and nitrogen availability in temperate forests. (FromPastor and Post1986.) © 2013 Elsevier, Inc. All rights reserved. From Fundamentals of Ecosystem Science, Weathers, Strayer, and Likens (eds).

Figure 7.8 Sediment N dynamics in the mesohaline portion of the Chesapeake Bay. (a) Seasonal variation in net fluxes of ammonium and nitrate across the sediment–water interface. (b) Seasonal variation in net nitrification and denitrification in sediments. Nitrogen dynamics are driven by oxygen availability, which is low in summer. (FromKemp et al ) © 2013 Elsevier, Inc. All rights reserved. From Fundamentals of Ecosystem Science, Weathers, Strayer, and Likens (eds).

Figure 7.9 Riverine N export versus net anthropogenic N inputs for nine regions. The regression suggests that 75% of input is “retained” in soils or vegetation or lost as gas somewhere within these large watersheds. (FromHowarth et al ) © 2013 Elsevier, Inc. All rights reserved. From Fundamentals of Ecosystem Science, Weathers, Strayer, and Likens (eds).