One-day rate measurements for estimating net nitrification potential in humid forest soils

Ross, Donald S.; Fredriksen, Guinevere; Jamison, Austin E.; Wemple, Beverley C.; Bailey, Scott W.; Shanley, James B.; Lawrence, Gregory B.

doi:10.1016/j.foreco.2006.04.022

Cited by 10 publications

(10 citation statements)

References 6 publications

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“…Of course, in many cases it will clearly be difficult to process tropical soils rapidly after sampling, particularly when working in remote locations or when samples must be transported some distance to laboratory facilities. In such circumstances, the most appropriate procedure may be to extract samples in the field (e.g., Ross et al, 2006;Hales and Ross, 2008), usingpreweighed bottles to which the extraction solution is added in advance. The solu- Fort Sherman don can be later decanted and stabilized before transport to the location of analysis and the weight of the soil can be calculated by drying the bottle, although it should be noted that changes in NH^ concentrations can still occur (Ross et al, 2006).…”

Section: Discussionmentioning

confidence: 99%

“…In such circumstances, the most appropriate procedure may be to extract samples in the field (e.g., Ross et al, 2006;Hales and Ross, 2008), usingpreweighed bottles to which the extraction solution is added in advance. The solu- Fort Sherman don can be later decanted and stabilized before transport to the location of analysis and the weight of the soil can be calculated by drying the bottle, although it should be noted that changes in NH^ concentrations can still occur (Ross et al, 2006). For PCh, the anion-exchange membranes can be removed after field extraction and stored in deionized water until subsequent processing.…”

Section: Discussionmentioning

confidence: 99%

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Short‐Term Changes in Extractable Inorganic Nutrients during Storage of Tropical Rain Forest Soils

Turner

Romero

2009

Soil Science Soc of Amer J

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The nutrient status of tropical forests is commonly assessed by measuring inorganic nutrients extracted from soil, yet samples from remote research sites may be stored for prolonged periods of time before analysis. We assessed the influence of soil storage conditions on extractable nutrients in three lowland tropical forests soils from the Republic of Panama. The soils spanned a strong rainfall gradient and contained contrasting chemical and physical properties. Storage treatments were: (i) room temperature (22°C in the dark), (ii) refrigerated (4°C in the dark), (iii) air dried (10 d at 22°C and 55% humidity), and (iv) frozen (−35°C). Ammonium and NO3 were extremely unstable and concentrations changed considerably within hours of sampling. Phosphate extracted by anion‐exchange membranes also changed rapidly following sampling, although cations (Ca, K, and Mg) extracted in Mehlich‐3 solution were less influenced by storage. Soil pH declined slowly in all samples during field‐moist storage (4 and 22°C). Freezing and air drying generally caused significant changes in extractable nutrients, although the effects varied among soils and nutrients. We therefore conclude that inorganic nutrients should be extracted from tropical forest soils within 24 h of sampling, and preferably on the day of sampling for N fractions, to ensure that values represent field conditions. Where this is not possible, rapid air drying or storage of field‐moist samples may be acceptable for some measurements (e.g., PO4, cations, pH), but are unlikely to provide realistic measurements of inorganic N.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Short‐Term Changes in Extractable Inorganic Nutrients during Storage of Tropical Rain Forest Soils

Turner

Romero

2009

Soil Science Soc of Amer J

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“…Net nitrification rates can be high even in mature forest systems (Stark and Hart, 1997), leading to gaseous losses during nitrification but mostly during denitrification, which is a dissimilatory anaerobic pathway (see Burt et al, 2010 for a review). Net rates of nitrification can be calculated from the changes of nitrate pool sizes over the course of in situ incubation of soils samples in polyethylene bags for several weeks (Eno, 1960;Malone et al, 2018) or even a day (Ross et al, 2006). Such measurement of net nitrification is only a potential rate (Hart et al, 1994) and can be interpreted as a proxy of potential nitrate contribution to the subjacent soil or adjacent stream (Ross et al, 2012).…”

Section: Riparian Corridors Function As Kidneys Of River Systemsmentioning

confidence: 99%

Riparian Corridors: A New Conceptual Framework for Assessing Nitrogen Buffering Across Biomes

Pinay

Bernal

Abbott

et al. 2018

Front. Environ. Sci.

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Anthropogenic activities have more than doubled the amount of reactive nitrogen circulating on Earth, creating excess nutrients across the terrestrial-aquatic gradient. These excess nutrients have caused worldwide eutrophication, fundamentally altering the functioning of freshwater and marine ecosystems. Riparian zones have been recognized to buffer diffuse nitrate pollution, reducing delivery to aquatic ecosystems, but nutrient removal is not their only function in river systems. In this paper, we propose a new conceptual framework to test the capacity of riparian corridors to retain, remove, and transfer nitrogen along the continuum from land to sea under different climatic conditions. Because longitudinal, lateral, and vertical connectivity in riparian corridors influences their functional role in landscapes, we highlight differences in these parameters across biomes. More specifically, we explore how the structure of riparian corridors shapes stream morphology (the river's spine), their multiple functions at the interface between the stream and its catchment (the skin), and their biogeochemical capacity to retain and remove nitrogen (the kidneys). We use the nitrogen cycle as an example because nitrogen pollution is one of the most pressing global environmental issues, influencing directly and indirectly virtually all ecosystems on Earth. As an initial test of the applicability of our interbiome approach, we present synthesis results of gross ammonification and net nitrification from diverse ecosystems.

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“…This study examines the effect of sample disturbance on gross and net nitrification rates in soils from two forested watersheds of Vermont. Soils from both watersheds have exhibited high rates of net nitrification after sampling (Ross et al 2004;Ross et al 2006). We used intact soil cores and composite soil samples representing minimally disturbed and highly disturbed soils, respectively.…”

Section: Introductionmentioning

confidence: 99%

Effect of soil mixing on nitrification rates in soils of two deciduous forests of Vermont, USA

2009

Self Cite

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Sampling disturbance has been shown to rapidly increase net nitrification rates in some forest soils. To gain insight on mechanisms, we investigated both gross and net rates of ammonification and nitrification in intact cores and mixed composite samples. Using the isotope pool dilution method, we studied samples from two northeastern USA watersheds, Brush Brook and Sleepers River in Vermont, where previous work had found high net nitrification rates. Gross ammonification was usually not significantly different between intact cores and mixed samples. However, gross and net nitrification rates in mixed samples were similar (mean ∼24µmol N kg −1 hr −1 or ∼8 mg N kg −1 d −1 ) and significantly higher than in intact cores (7.7 and 3.4µmol N kg −1 h −1 for means of gross and net respectively). Nitrate consumption was decreased somewhat by disturbance but did not account for the large differences in net rates. Because there were similar gross ammonification rates in both treatments, increased nitrification in these disturbed soils must be a result of an increase in the utilization of ammonium by the ammonia oxidizers at the expense of other ammonium consumption pathways. Different mechanisms may operate in different soils; increased nitrification appears to be the primary pathway in these soils with high N cycling rates.

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One-day rate measurements for estimating net nitrification potential in humid forest soils

Cited by 10 publications

References 6 publications

Short‐Term Changes in Extractable Inorganic Nutrients during Storage of Tropical Rain Forest Soils

Short‐Term Changes in Extractable Inorganic Nutrients during Storage of Tropical Rain Forest Soils

Riparian Corridors: A New Conceptual Framework for Assessing Nitrogen Buffering Across Biomes

Effect of soil mixing on nitrification rates in soils of two deciduous forests of Vermont, USA

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