Abstract
While moisture availability exerts strong controls on biogeochemical processes in drylands, several studies have found no relationship between litter decay and precipitation. We examined whether interactions between precipitation and photodegradation could play a role in the inconsistent response of decay to precipitation. We assessed mass loss of 4 leaf litter types on the surface of the Sonoran Desert over 9.5 months in a full-factorial experiment consisting of 3 radiation treatments (full sunlight, filtered from photodegrading (UV/violet-blue) sunlight, complete shade) and 2 precipitation levels (ambient, supplemental (2.7 × ambient)). Exposure to photodegrading sunlight nearly doubled (i.e. 1.9) litter mass loss, and in combination with supplemental precipitation accelerated decay by 2.6 times. Surprisingly, supplemental precipitation had no influence on decay of litter that did not receive photodegrading sunlight. That photodegradation was required for supplemental precipitation to accelerate decay could explain past findings that decay is not related to precipitation, as most studies assessed litter shaded by plant canopies. Sunlight or precipitation treatments had no effect on litter microbial respiration, even though concentrations of water-soluble compounds were > 2 times greater in photodegraded litter. In a second experiment, we assessed the mass loss from litter attributable to a 30-min immersion in water. Immersion losses were 2.5 times greater from litter exposed to photodegrading sunlight for 20 months in the field than litter filtered from this sunlight, and these losses were strongly correlated with decay. Our findings demonstrate that photodegrading sunlight greatly accelerates litter decay, precipitation magnifies this effect, and leaching is likely a significant mechanism.
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References
Almagro M, Maestre FT, Martínez-López J, Valencia E, Rey A (2015) Climate change may reduce litter decomposition while enhancing the contribution of photodegradation in dry perennial Mediterranean grasslands. Soil Bio Biochem 90:214–223
Almagro M, Martínez-López J, Maestre FT, Rey A (2017) The contribution of photodegradation to litter decomposition in semiarid Mediterranean grasslands depends on its interaction with local humidity conditions, litter quality and position. Ecosystems 20:527–542
Austin AT (2011) Has water limited our imagination for aridland biogeochemistry? Trends Ecol Evol 26:229–235
Austin AT, Ballaré CL (2010) Dual role of lignin in plant litter decomposition in terrestrial ecosystems. Proc Natl Acad of Sci USA 107:4618–4622
Austin AT, Méndez MS, Ballaré CL (2016) Photodegradation alleviates the lignin bottleneck for carbon turnover in terrestrial ecosystems. Proc Natl Acad Sci USA 113:4392–4397
Baker NR, Allison SD (2015) Ultraviolet photodegradation facilitates microbial litter decomposition in a Mediterranean climate. Ecology 96:1994–2003
Barnard RL, Blazewicz SJ, Firestone MK (2020) Rewetting of soil: Revisiting the origin of soil CO2 emissions. Soil Biol Biochem 147:107819
Barnes PW, Throop HL, Archer SR, Breshears DD, McCulley RL, Tobler MA (2015) Sunlight and soil-litter mixing: drivers of litter decomposition in drylands. Prog Bot 76:273–302
Berenstecher P, Vivanco L, Pérez LI, Ballaré CL, Austin A (2020) Sunlight doubles aboveground carbon loss in a seasonally dry woodland in Patagonia. Curr Biol 30:3243–3251
Bosco T, Bertiller MB, Carrera AL (2016) Combined effects of litter features, UV radiation, and soil water on litter decomposition in denuded areas of the arid Patagonian Monte. Plant Soil 406:71–82
Brandt LA, King JY, Milchunas DG (2007) Effects of ultraviolet radiation on litter decomposition depend on precipitation and litter chemistry in a shortgrass steppe ecosystem. Glob Change Biol 13:2193–2205
Brandt LA, Bohnet C, King JY (2009) Photochemically induced carbon dioxide production as a mechanism for carbon loss from plant litter in arid ecosystems. J Geophys Res Biogeosci 114:1–13
Brown DE, Brennan TC, Unmack PJ (2007) A digitized biotic community map for plotting and comparing North American plant and animal distributions. Canotia 3:1–12
Day TA, Bliss MS (2019) A spectral weighting function for abiotic photodegradation based on photochemical emission of CO2 from leaf litter in sunlight. Biogeochemistry 146:173–190
Day TA, Bliss MS (2020) Solar photochemical emission of CO2 from leaf litter: sources and significance to C loss. Ecosystems 23:1344–1361
Day TA, Zhang ET, Ruhland CT (2007) Exposure to solar UV-B radiation accelerates mass and lignin loss of Larrea tridentata litter in the Sonoran Desert. Plant Ecol 193:185–194
Day TA, Guénon R, Ruhland CT (2015) Photodegradation of plant litter in the Sonoran Desert varies by litter type and age. Soil Biol Biochem 89:109–122
Day TA, Bliss MS, Tomes AR, Ruhland CT, Guénon R (2018) Desert leaf litter decay: coupling of microbial respiration, water soluble fractions and photodegradation. Glob Change Biol 24:5454–5470
Dirks I, Navon Y, Kanas D, Dumbur R, Grünzweig JM (2010) Atmospheric water vapor as driver of litter decomposition in Mediterranean shrubland and grassland during rainless seasons. Glob Change Biology 16:2799–2812
Ekaya W, Kinyamario J (2001) Production and decomposition of plant litter in an arid rangeland of Kenya. Afr J Range Forage Sci 18:125–129
Esch EH, King JY, Cleland EE (2019) Foliar litter chemistry mediates susceptibility to UV degradation in two dominant species from a semi-arid ecosystem. Plant Soil 440:265–276
Evans S, Todd-Brown KEO, Jacobson K, Jacobson P (2020) Non-rainfall moisture: a key driver of microbial respiration from standing litter in arid, semiarid, and mesic grasslands. Ecosystems 23:1154–1169
Foereid B, Bellarby J, Meier-Augenstein W, Kemp H (2010) Does light exposure make plant litter more degradable? Plant Soil 333:275–285
Frouz J, Cajthaml T, Mudrák O (2011) The effect of lignin photodegradation on decomposability of Calamagrostis epigeios grass litter. Biodegradation 22:1247–1254
Gliksman D, Rey A, Seligmann R, Dumbur R, Sperling O, Navon Y, Haenel S, DeAngelis P, Arnone JA, Grünzweig JM (2017) Biotic degradation at night, abiotic degradation at day: positive feedbacks on litter decomposition in drylands. Glob Change Biology 23:1564–1574
Hamerlynck EP, McAuliffe JR, Smith SD (2000) Effects of surface and sub-surface soil horizons on the seasonal performance of Larrea tridentata (creosotebush). Funct Ecol 14:596–606
Hewins DB, Throop HL (2016) Leaf litter decomposition is rapidly enhanced by the co-occurrence of monsoon rainfall and soil-litter mixing across a gradient of coppice dune development in the Chihuahuan Desert. J Arid Environ 129:111–118
Huang G, Li Y (2017) Photodegradation effects are related to precipitation amount, precipitation frequency and litter traits in a desert ecosystem. Soil Bio Biochem 115:383–392
Huang G, Zhao M, Li Y (2017) Litter decomposition in hyper-arid deserts: photodegradation is still important. Sci Total Environ 601–602:784–792
Jacobson K, Van Diepeningen A, Evans S, Fritts R, Gemmel P, Marsho C, Seely M, Wenndt A, Yang X, Jacobson P (2015) Non-rainfall moisture activates fungal decomposition of surface litter in the Namib Sand Sea. PLoS One 10:e0126977
Joly F-X, Kurupas KL, Throop HL (2017) Pulse frequency and soil-litter mixing alter the control of cumulative precipitation over litter decomposition. Ecology 98:2255–2260
Kemp PR, Reynolds JF, Virginia RA, Whitford WG (2003) Decomposition of leaf and root litter of Chihuahuan desert shrubs: effects of three years of summer drought. J Arid Environ 53:21–39
King JY, Brandt LA, Adair EC (2012) Shedding light on plant litter decomposition: advances, implications and new directions in understanding the role of photodegradation. Biogeochemistry 111:57–81
Lee H, Rahn T, Throop H (2012) An accounting of C-based trace gas release during abiotic plant litter degradation. Glob Change Biology 18:1185–1195
Lin Y, King JY (2014) Effects of UV exposure and litter position on decomposition in a California grassland. Ecosystems 17:158–168
Lin Y, Karlen SD, Ralph J, King JY (2018) Short-term facilitation of microbial litter decomposition by ultraviolet radiation. Sci Total Environ 615:838–848
Marinho OA, Martinelli LA, Duarte-Neto PJ, Mazzi EA, King JY (2020) Photodegradation influences litter decomposition rate in a humid tropical ecosystem. Brazil. Sci Total Environ 715:136601
Méndez MS, Martinez ML, Araujo PI, Austin AT (2019) Solar radiation exposure accelerates decomposition and biotic activity in surface litter but not soil in a semiarid woodland ecosystem in Patagonia, Argentina. Plant Soil 445:483–496
Predick KI, Archer SR, Aguillon SM, Keller DA, Throop HL, Barnes PW (2018) UV-B radiation and shrub canopy effects on surface litter decomposition in a shrub-invaded dry grassland. J Arid Environ 157:13–21
Pucheta E, Llanos M, Meglioli C, Gaviorno M, Ruiz M, Parera C (2006) Litter decomposition in a sandy Monte desert of western Argentina: Influences of vegetation patches and summer rainfall. Aust Ecol 31:808–816
Rutledge S, Campbell DI, Baldocchi D, Schipper LA (2010) Photodegradation leads to increased carbon dioxide losses from terrestrial organic matter. Glob Change Biology 16:3065–3074
Santos PF, Elkins NZ, Steinberger Y, Whitford WG (1984) A comparison of surface and buried Larrea tridentata leaf litter decomposition in North American hot deserts. Ecology 65:278–284
Schaefer D, Steinberger Y, Whitford WG (1985) The failure of nitrogen and lignin control of decomposition in a North American desert. Oecologia 65:382–386
Sponseller RA (2007) Precipitation pulses and soil CO2 flux in a Sonoran Desert ecosystem. Glob Change Biology 13:426–436
Steinberger Y, Whitford WG (1988) Decomposition process in Negev ecosystems. Oecologia 75:61–66
Strojan CL, Randall DC, Turner FB (1987) Relationship of leaf litter decomposition rates to rainfall in the Mojave Desert. Ecology 68:741–744
Throop HL, Archer SR (2009) Resolving the dryland decomposition conundrum: some new perspectives on potential drivers. Prog Bot 70:171–194
Vanderbilt KL, White CS, Hopkins O, Craig J (2008) Aboveground decomposition in arid environments: results of a long-term study in central New Mexico. J Arid Environ 72:696–709
Wang J, Liu L, Wang X, Chen Y (2015a) The interaction between abiotic photodegradation and microbial decomposition under ultraviolet radiation. Glob Change Biology 21:2095–2104
Wang L, Throop HL, Gill T (2015b) A novel method to continuously monitor litter moisture – a microcosm-based experiment. J Arid Environ 115:10–13
Wang J, Yang S, Zhang B, Liu W, Deng M, Chen S, Liu L (2017a) Temporal dynamics of ultraviolet radiation impacts on litter decomposition in a semi-arid ecosystem. Plant Soil 419:71–81
Wang J, Liu L, Wang X, Yang S, Zhang B, Li P, Qiao C, Deng M, Liu W (2017b) High night-time humidity and dissolved organic carbon content support rapid decomposition of standing litter in a semi-arid landscape. Funct Ecol 31:1659–1668
Whitford WG, Repass R, Parker LW, Elkins NZ (1982) Effects of initial litter accumulation and climate on litter disappearance in a desert ecosystem. Am Midl Nat 108:105–110
Whitford WG, Steinberger Y, MacKay W, Parker LW, Freckman D, Wallwork JA, Weems D (1986) Rainfall and decomposition in the Chihuahuan Desert. Oecologia 68:512–515
Yahdjian L, Sala O, Austin A (2006) Differential controls of water input on litter decomposition and nitrogen dynamics in the Patagonian Steppe. Ecosystems 9:128–141
Acknowledgements
The assistance of Alexander Tomes, Rachel Roland, Madison Lusk and Sarah Placek in field work, sample preparation and analyses is appreciated. We thank three anonymous reviewers whose constructive comments improved this manuscript. This work was supported by US National Science Foundation grant DEB-1256180 to TAD. The authors declare no conflict of interest.
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Day, T.A., Urbine, J.M. & Bliss, M.S. Supplemental precipitation accelerates decay but only in photodegraded litter and implications that sunlight promotes leaching loss. Biogeochemistry 158, 113–129 (2022). https://doi.org/10.1007/s10533-022-00888-x
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DOI: https://doi.org/10.1007/s10533-022-00888-x