Expanding our understanding of nitrogen dynamics after fire: how severe fire and aridity reduce ecosystem nitrogen retention
Maxwell Kay Strain
A , Mary K. Brady A and Erin J. Hanan A *
A
Abstract
Fires release large pulses of nitrogen (N), which can be taken up by recovering plants and microbes or exported to streams where it can threaten water quality.
The amount of N exported depends on the balance between N mineralisation and rates of N uptake after fire. Burn severity and soil moisture interact to drive these rates, but their effects can be difficult to predict.
To understand how soil moisture and burn severity influence post-fire N cycling and retention in a dryland watershed, we quantified changes in plant biomass, plant N content, soil microbial biomass, inorganic N pools, and net N mineralisation for 2 years after fire. We compared sites that were unburned with those that burned at moderate or high severity, capturing variation in soil moisture within each severity category.
Severe fire limited N uptake by plants. Dry conditions after fire limited both plant and microbial N uptake.
When fire is severe or when soils are relatively dry after fire, recovering plants and microbes are less likely to take up post-fire N and therefore, N in these sites is more susceptible to export.
Keywords: burn severity, ecosystem processes, post-fire impacts, soil biogeochemistry, dryland ecosystems, nitrogen cycling, water quality, N saturation.
References
Abatzoglou JT, Williams AP (2016) Impact of anthropogenic climate change on wildfire across western US forests. Proceedings of the National Academy of Sciences 113, 11770-11775.
| Crossref | Google Scholar | PubMed |
Aber JD (1992) Nitrogen cycling and nitrogen saturation in temperate forest ecosystems. Trends in Ecology & Evolution 7, 220-224.
| Crossref | Google Scholar | PubMed |
Aber JD, Nadelhoffer KJ, Steudler P, Melillo JM (1989) Nitrogen saturation in Northern forest ecosystems. BioScience 39, 378-386.
| Crossref | Google Scholar |
Adkins J, Docherty KM, Gutknecht JLM, Miesel JR (2020) How do soil microbial communities respond to fire in the intermediate term? Investigating direct and indirect effects associated with fire occurrence and burn severity. Science of The Total Environment 745, 140957.
| Crossref | Google Scholar | PubMed |
Austin AT, Yahdjian L, Stark JM, Belnap J, Porporato A, Norton U, Ravetta DA, Schaeffer SM (2004) Water pulses and biogeochemical cycles in arid and semiarid ecosystems. Oecologia 141, 221-235.
| Crossref | Google Scholar | PubMed |
Birch HF (1964) Mineralisation of plant nitrogen following alternate wet and dry conditions. Plant and Soil 20, 43-49.
| Crossref | Google Scholar |
Braakhekke MC, Rebel KT, Dekker SC, Smith B, Beusen AHW, Wassen MJ (2017) Nitrogen leaching from natural ecosystems under global change: a modelling study. Earth System Dynamics 8, 1121-1139.
| Crossref | Google Scholar |
Brady MK, Hanan EJ, Dickinson MB, Miesel JR, Wade L, Greenberg J (2022) How interactions between wildfire and seasonal soil moisture fluxes drive nitrogen cycling in Northern Sierra Nevada forests. International Journal of Wildland Fire 31, 786-798.
| Crossref | Google Scholar |
Cairney JWG, Bastias BA (2007) Influences of fire on forest soil fungal communities. Canadian Journal of Forest Research 37, 207-215.
| Crossref | Google Scholar |
Christensen NL, Muller CH (1975) Effects of fire on factors controlling plant growth in Adenostoma Chaparral. Ecological Monographs 45, 29-55.
| Crossref | Google Scholar |
Covington WW, Sackett SS (1992) Soil mineral nitrogen changes following prescribed burning in ponderosa pine. Forest Ecology and Management 54, 175-191.
| Crossref | Google Scholar |
Debano LF, Conrad CE (1978) The effect of fire on nutrients in a chaparral ecosystem. Ecology 59, 489-497.
| Crossref | Google Scholar |
Delwiche J (2010) After the fire, follow the nitrogen. JFSP Briefs 80, 1-6.
| Google Scholar |
Dooley SR, Treseder KK (2012) The effect of fire on microbial biomass: a meta-analysis of field studies. Biogeochemistry 109, 49-61.
| Crossref | Google Scholar |
Fenn ME, Poth MA, Johnson DW (1996) Evidence for nitrogen saturation in the San Bernardino Mountains in southern California. Forest Ecology and Management 82, 211-230.
| Crossref | Google Scholar |
Fenn ME, Jovan S, Yuan F, Geiser L, Meixner T, Gimeno BS (2008) Empirical and simulated critical loads for nitrogen deposition in California mixed conifer forests. Environmental Pollution 155, 492-511.
| Crossref | Google Scholar | PubMed |
Gill NS, Turner MG, Brown CD, Glassman SI, Haire SL, Hansen WD, Pansing ER, St Clair SB, Tomback DF (2022) Limitations to propagule dispersal will constrain post-fire recovery of plants and fungi in Western coniferous forests. BioScience 72, 347-364.
| Crossref | Google Scholar |
Glass DW, Johnson DW, Blank RR, Miller WW (2008) Factors affecting mineral nitrgen transformations by soil heating: a laboratory-simulated fire study. Soil Science 173, 387-400.
| Crossref | Google Scholar |
Goodridge BM, Hanan EJ, Aguilera R, Wetherley EB, Chen Y-J, D’Antonio CM, Melack JM (2018) Retention of nitrogen following wildfire in a chaparral ecosystem. Ecosystems 21, 1608-1622.
| Crossref | Google Scholar |
Gustine RN, Hanan EJ, Robichaud PR, Elliot WJ (2022) From burned slopes to streams: how wildfire affects nitrogen cycling and retention in forests and fire-prone watersheds. Biogeochemistry 157, 51-68.
| Crossref | Google Scholar |
Hanan EJ, D’Antonio CM, Roberts DA, Schimel JP (2016) Factors regulating nitrogen retention during the early stages of recovery from fire in coastal chaparral ecosystems. Ecosystems 19, 910-926.
| Crossref | Google Scholar |
Hanan EJ, Tague CN, Schimel JP (2017) Nitrogen cycling and export in California chaparral: the role of climate in shaping ecosystem responses to fire. Ecological Monographs 87, 76-90.
| Crossref | Google Scholar |
Hanan EJ, Kennedy MC, Ren J, Johnson MC, Smith AMS (2022) Missing climate feedbacks in fire models: limitations and uncertainties in fuel loadings and the role of decomposition in fine fuel accumulation. Journal of Advances in Modeling Earth Systems 14, e2021MS002818.
| Crossref | Google Scholar |
Hart SC, DeLuca TH, Newman GS, MacKenzie MD, Boyle SI (2005) Post-fire vegetative dynamics as drivers of microbial community structure and function in forest soils. Forest Ecology and Management 220, 166-184.
| Crossref | Google Scholar |
Hobbs NT, Schimel DS (1984) Fire effects on nitrogen mineralization and fixation in mountain shrub and grassland communities. Journal of Range Management 37, 402-405.
| Crossref | Google Scholar |
Homyak PM, Sickman JO, Miller AE, Melack JM, Meixner T, Schimel JP (2014) Assessing nitrogen-saturation in a seasonally dry chaparral watershed: limitations of traditional indicators of N-saturation. Ecosystems 17, 1286-1305.
| Crossref | Google Scholar |
Hooper DU, Johnson L (1999) Nitrogen limitation in dryland ecosystems: responses to geographical and temporal variation in precipitation. Biogeochemistry 46, 247-293.
| Crossref | Google Scholar |
Jones MW, Abatzoglou JT, Veraverbeke S, Andela N, Lasslop G, Forkel M, Smith AJP, Burton C, Betts RA, Van Der Werf GR, Sitch S, Canadell JG, Santín C, Kolden C, Doerr SH, Le Quéré C (2022) Global and regional trends and drivers of fire under climate change. Reviews of Geophysics 60, e2020RG000726.
| Crossref | Google Scholar |
Kauffman JB, Sanford RL, Cummings DL, Salcedo IH, Sampaio EVSB (1993) Biomass and nutrient dynamics associated with slash fires in neotropical dry forests. Ecology 74, 140-151.
| Crossref | Google Scholar |
Keeley JE (2009) Fire intensity, fire severity and burn severity: a brief review and suggested usage. International Journal of Wildland Fire 18, 116-126.
| Crossref | Google Scholar |
Keeley JE, Pausas JG (2022) Evolutionary ecology of fire. Annual Review of Ecology, Evolution, and Systematics 53, 203-225.
| Crossref | Google Scholar |
Keyser A, LeRoy Westerling A (2017) Climate drives inter-annual variability in probability of high severity fire occurrence in the western United States. Environmental Research Letters 12, 065003.
| Crossref | Google Scholar |
Klemmedson JO, Wienhold BJ (1992) Aspect and species influences on nitrogen and phosphorus accumulation in Arizona chaparral soil‐plant systems. Arid Soil Research and Rehabilitation 6, 105-116.
| Crossref | Google Scholar |
Lepper MG, Fleschner M (1977) Nitrogen fixation by Cercocarpus ledifolius (Rosaceae) in pioneer habitats. Oecologia 27, 333-338.
| Crossref | Google Scholar | PubMed |
Lovett GM, Goodale CL (2011) A new conceptual model of nitrogen saturation based on experimental nitrogen addition to an oak forest. Ecosystems 14, 615-631.
| Crossref | Google Scholar |
Mason RE, Craine JM, Lany NK, Jonard M, Ollinger SV, Groffman PM, Fulweiler RW, Angerer J, Read QD, Reich PB, Templer PH, Elmore AJ (2022) Evidence, causes, and consequences of declining nitrogen availability in terrestrial ecosystems. Science 376, eabh3767.
| Crossref | Google Scholar | PubMed |
McDowell N, Pockman WT, Allen CD, Breshears DD, Cobb N, Kolb T, Plaut J, Sperry J, West A, Williams DG, Yepez EA (2008) Mechanisms of plant survival and mortality during drought: why do some plants survive while others succumb to drought? New Phytologist 178, 719-739.
| Crossref | Google Scholar | PubMed |
Meixner T, Fenn ME, Wohlgemuth P, Oxford M, Riggan P (2006) N saturation symptoms in chaparral catchments are not reversed by prescribed fire. Environmental Science & Technology 40, 2887-2894.
| Crossref | Google Scholar | PubMed |
Meng R, Dennison PE, Huang C, Moritz MA, D’Antonio C (2015) Effects of fire severity and post-fire climate on short-term vegetation recovery of mixed-conifer and red fir forests in the Sierra Nevada Mountains of California. Remote Sensing of Environment 171, 311-325.
| Crossref | Google Scholar |
Midgley JJ, Kruger LM, Skelton R (2011) How do fires kill plants? The hydraulic death hypothesis and Cape Proteaceae “fire-resisters”. South African Journal of Botany 77, 381-386.
| Crossref | Google Scholar |
NADP Program Office (2024) ‘National Atmospheric Deposition Program.’ (Wisconsin State Laboratory of Hygiene: Madison, WI, USA) Available at https://nadp.slh.wisc.edu/
National Water and Climate Center, NRCS, USDA (2024) Air and water database. Available at https://wcc.sc.egov.usda.gov/reportGenerator/
Neary DG, Klopatek CC, DeBano LF, Ffolliott PF (1999) Fire effects on belowground sustainability: a review and synthesis. Forest Ecology and Management 122, 51-71.
| Crossref | Google Scholar |
Osborne BB, Roybal CM, Reibold R, Collier CD, Geiger E, Phillips ML, Weintraub MN, Reed SC (2022) Biogeochemical and ecosystem properties in three adjacent semi‐arid grasslands are resistant to nitrogen deposition but sensitive to edaphic variability. Journal of Ecology 110, 1615-1631.
| Crossref | Google Scholar |
Parsons A, Robichaud P, Lewis S, Napper C (2010) Field Guide for Mapping Post-fire Soil Burn Severity. General Technical Report, RMRS-GTR-243. Available at https://www.fs.usda.gov/rm/pubs/rmrs_gtr243.pdf
Pendergrass AG, Knutti R, Lehner F, Deser C, Sanderson BM (2017) Precipitation variability increases in a warmer climate. Scientific Reports 7, 17966.
| Crossref | Google Scholar | PubMed |
Plaza C, Zaccone C, Sawicka K, Méndez AM, Tarquis A, Gascó G, Heuvelink GBM, Schuur EAG, Maestre FT (2018) Soil resources and element stocks in drylands to face global issues. Scientific Reports 8, 13788.
| Crossref | Google Scholar | PubMed |
Poulter B, Frank D, Ciais P, Myneni RB, Andela N, Bi J, Broquet G, Canadell JG, Chevallier F, Liu YY, Running SW, Sitch S, Van Der Werf GR (2014) Contribution of semi-arid ecosystems to interannual variability of the global carbon cycle. Nature 509, 600-603.
| Crossref | Google Scholar | PubMed |
Raison RJ (1979) Modification of the soil environment by vegetation fires, with particular reference to nitrogen transformations: a review. Plant and Soil 51, 73-108.
| Crossref | Google Scholar |
R Core Team (2021) R: A Language and Environment for Statistical Computing. Available at https://www.R-project.org/
Ren J, Hanan EJ, D’Odorico P, Tague C, Schimel JP, Homyak PM (2024a) Dryland watersheds in flux: how nitrogen deposition and changing precipitation regimes shape nitrogen export. Earth’s Future 12, e2023EF004120.
| Crossref | Google Scholar |
Ren J, Hanan EJ, Greene A, Tague C, Krichels AH, Burke WD, Schimel JP, Homyak PM (2024b) Simulating the role of biogeochemical hotspots in driving nitrogen export from dryland watersheds. Water Resources Research 60, e2023WR036008.
| Crossref | Google Scholar |
Rhoades CC, Entwhistle D, Butler D (2011) The influence of wildfire extent and severity on streamwater chemistry, sediment and temperature following the Hayman Fire, Colorado. International Journal of Wildland Fire 20, 430-442.
| Crossref | Google Scholar |
Rust AJ, Saxe S, McCray J, Rhoades CC, Hogue TS (2019) Evaluating the factors responsible for post-fire water quality response in forests of the western USA. International Journal of Wildland Fire 28, 769-784.
| Crossref | Google Scholar |
Schimel JP (2018) Life in dry soils: effects of drought on soil microbial communities and processes. Annual Review of Ecology, Evolution, and Systematics 49, 409-432.
| Crossref | Google Scholar |
Stanford G, Epstein E (1974) Nitrogen mineralization-water relations in soils. Soil Science Society of America Journal 38, 103-107.
| Crossref | Google Scholar |
Stark JM, Firestone MK (1995) Mechanisms for soil moisture effects on activity of nitrifying bacteria. Applied and Environmental Microbiology 61, 218-221.
| Crossref | Google Scholar | PubMed |
Thomson FJ, Moles AT, Auld TD, Kingsford RT (2011) Seed dispersal distance is more strongly correlated with plant height than with seed mass: dispersal distance and seed mass. Journal of Ecology 99, 1299-1307.
| Crossref | Google Scholar |
Turner MG, Smithwick EAH, Metzger KL, Tinker DB, Romme WH (2007) Inorganic nitrogen availability after severe stand-replacing fire in the Greater Yellowstone ecosystem. Proceedings of the National Academy of Sciences 104, 4782-4789.
| Crossref | Google Scholar | PubMed |
Urza AK, Weisberg PJ, Board D, Chambers JC, Kitchen SG, Roundy BA (2021) Episodic occurrence of favourable weather constrains recovery of a cold desert shrubland after fire. Journal of Applied Ecology 58, 1776-1789.
| Crossref | Google Scholar |
USDA Forest Service/U.S. Geological Survey (2024) Monitoring Trends in Burn Severity (MTBS) Data Access: Fire Level Geospatial Data. Available at http://mtbs.gov/direct-download [accessed 29 June 2019]
Verkaik I, Rieradevall M, Cooper SD, Melack JM, Dudley TL, Prat N (2013) Fire as a disturbance in mediterranean climate streams. Hydrobiologia 719, 353-382.
| Crossref | Google Scholar |
Vitousek PM, Treseder KK, Howarth RW, Menge DNL (2022) A “toy model” analysis of causes of nitrogen limitation in terrestrial ecosystems. Biogeochemistry 160, 381-394.
| Crossref | Google Scholar |
Weiner NI, Strand EK, Bunting SC, Smith AMS (2016) Duff distribution influences fire severity and post-fire vegetation recovery in sagebrush steppe. Ecosystems 19, 1196-1209.
| Crossref | Google Scholar |
West AW, Sparling GP (1986) Modifications to the substrate-induced respiration method to permit measurement of microbial biomass in soils of differing water contents. Journal of Microbiological Methods 5, 177-189.
| Crossref | Google Scholar |
Wood DJA, Seipel T, Irvine KM, Rew LJ, Stoy PC (2019) Fire and development influences on sagebrush community plant groups across a climate gradient in northern Nevada. Ecosphere 10, e02990.
| Crossref | Google Scholar |
Xu W, Elberling B, Ambus PL (2022) Pyrogenic organic matter as a nitrogen source to microbes and plants following fire in an Arctic heath tundra. Soil Biology and Biochemistry 170, 108699.
| Crossref | Google Scholar |
Zhang F, Biederman JA, Dannenberg MP, Yan D, Reed SC, Smith WK (2021) Five decades of observed daily precipitation reveal longer and more variable drought events across much of the Western United States. Geophysical Research Letters 48, e2020GL092293.
| Crossref | Google Scholar |
