Ecological issues related to N deposition to natural ecosystems: research needs

Adams, Mary Beth

doi:10.1016/s0160-4120(02)00179-4

Cited by 55 publications

(35 citation statements)

References 95 publications

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“…A positive response in the initial decomposition phase and a negative response in later stages have also been found (Berg et al, 1998;Berg and Matzner, 1997). Thus, to reach a better understanding of the influence of N on the decomposition process, there is still a need for further investigation (Adams, 2003;Vestgarden, 2001). Furthermore, most studies of the effects of nitrogen addition on litter decomposition have been performed in temperate forest ecosystems, little information is available about responses to atmospheric nitrogen deposition in subtropical and tropical forests (Micks et al, 2004;Vitousek, 1998).…”

Section: Introductionmentioning

confidence: 99%

Response of Litter Decomposition to Simulated N Deposition in Disturbed, Rehabilitated and Mature Forests in Subtropical China

et al. 2006

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The response of decomposition of litter for the dominant tree species in disturbed (pine), rehabilitated (pine and broadleaf mixed) and mature (monsoon evergreen broadleaf) forests in subtropical China to simulated N deposition was studied to address the following hypothesis: (1) litter decomposition is faster in mature forest (high soil N availability) than in rehabilitated/disturbed forests (low soil N availability); (2) litter decomposition is stimulated by N addition in rehabilitated and disturbed forests due to their low soil N availability; (3) N addition has little effect on litter decomposition in mature forest due to its high soil N availability. The litterbag method (a total of 2880 litterbags) and N treatments: Control-no N addition, Low-N: )5 g N m )2 y )1 , Medium-N: )10 g N m )2 y )1 , and High-N: )15 g N m )2 y )1 , were employed to evaluate decomposition . Results indicated that mature forest, which has likely been N saturated due to both long-term high N deposition in the region and the age of the ecosystem, had the highest litter decomposition rate, and exhibited no significant positive and even some negative response to nitrogen additions. However, both disturbed and rehabilitated forests, which are still N limited due to previous land use history, exhibited slower litter decomposition rates with significant positive effects from nitrogen additions. These results suggest that litter decomposition and its responses to N addition in subtropical forests of China vary depending on the nitrogen status of the ecosystem.

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Section: Introductionmentioning

confidence: 99%

Response of Litter Decomposition to Simulated N Deposition in Disturbed, Rehabilitated and Mature Forests in Subtropical China

et al. 2006

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“…The deleterious effects of atmospheric nitrogen (N) and sulfur (S) deposition on terrestrial ecosystems have been widely studied (Adams, 2003;Burns, 2004;Driscoll et al, 2003;Shannon, 1999). Ecosystem changes include the acidification of soils and surface waters (Driscoll et al, 2001(Driscoll et al, , 2003, the loss of base cations (Adams et al, 2000;Fernandez and Rustad, 1990), N saturation (Aber, 1992;Peterjohn et al, 1996) and metal mobilization (Johnson and Fernandez, 1992;Larssen et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

Soilaluminum, Iron, and Phosphorus Dynamics in Response to Long-Term Experimental Nitrogen and Sulfur Additions at the Bear Brook Watershed in Maine, USA

Sherman

Fernandez

Norton

et al. 2006

Environ Monit Assess

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Atmospheric deposition of nitrogen (N) and sulfur (S) containing compounds affects soil chemistry in forested ecosystems through (1) acidification and the depletion of base cations, (2) metal mobilization, particularly aluminum (Al), and iron (Fe), (3) phosphorus (P) mobilization, and (4) N accumulation. The Bear Brook Watershed in Maine (BBWM) is a long-term paired whole-watershed experimental acidification study demonstrating evidence of each of these acidification characteristics in a northeastern U.S. forested ecosystem. In 2003, BBWM soils were studied using the Hedley fractionation procedure to better understand mechanisms of response in soil Al, Fe, and P chemistry. Soil P fractionation showed that recalcitrant P was the dominant fraction in these watersheds (49%), followed by Al and Fe associated P (24%), indicating that a majority of the soil P was biologically unavailable. Acidification induced mobilization of Al and Fe in these soils holds the potential for significant P mobilization. Forest type appears to exert important influences on metal and P dynamics. Soils supporting softwoods showed evidence of lower Al and Fe in the treated watershed, accompanied by lower soil P. Hardwood soils had higher P concentrations in surface soils as a result of increased biocycling in response to N additions in treatments. Accelerated P uptake and return in litterfall overshadowed acidification induced P mobilization and depletion mechanisms in hardwoods.

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“…Excess nitrogen often results in fertilization of the ecosystem leading to shifts in biogeochemical cycling, plant community structure, and physiological parameters (Corbin et al, 2003;Lovett et al, 2002;McNulty et al, 1996). Additional consequences of excess nitrogen in terrestrial ecosystems include loss of species biodiversity, (Fenn et al, 2003a;Galloway et al, 2003;Stevens, Dise, Mountford, & Gowing, 2004) loss of ecologically sensitive lichens, reduced diversity in arbuscular mycorrhizal fungal communities, shifts in forest species composition, and increased pressure from invasive species better able to utilize increased nitrogen (Adams, 2003;Fenn et al, 2003a). Plant physiology can be affected by increased foliar nitrogen concentration (Aber et al, , 2002.…”

Section: Effects Of Nutrient-nitrogen Enrichment In Terrestrial and Amentioning

confidence: 99%

An Overview of Nitrogen Critical Loads for Policy Makers, Stakeholders, and Industries in the United States

Fisher

Mays

Wylie

2006

Water Air Soil Pollut

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Ecological issues related to N deposition to natural ecosystems: research needs

Cited by 55 publications

References 95 publications

Response of Litter Decomposition to Simulated N Deposition in Disturbed, Rehabilitated and Mature Forests in Subtropical China

Response of Litter Decomposition to Simulated N Deposition in Disturbed, Rehabilitated and Mature Forests in Subtropical China

Soilaluminum, Iron, and Phosphorus Dynamics in Response to Long-Term Experimental Nitrogen and Sulfur Additions at the Bear Brook Watershed in Maine, USA

An Overview of Nitrogen Critical Loads for Policy Makers, Stakeholders, and Industries in the United States

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