Abstract
Throughout the savanna biome, woody vegetation is cleared to increase productivity of herbaceous pasture. While clearing can result in increased pasture production of semi-arid dystrophic savannas in the short term, it is uncertain whether production is sustained in the long term. There is insufficient knowledge of how clearing affects soil nutrient and organic carbon (SOC) stocks. Using cleared-uncleared site pairs, we evaluated techniques for time-integrated assessment of nutrient and carbon relations in Australian savanna. Short-term in situ resin incubation showed that soil at cleared sites had a higher time-integrated availability of ammonium and nitrate, indicating that nitrogen (N) may turn over faster and/or is taken up slower at cleared sites than uncleared savanna. Nitrate and ammonium availability was approximately 2-fold higher in spring than in summer, likely due to greater uptake and/or loss of nitrate during summer rains. Nitrate was a prominent N source for evergreen trees, especially before summer rain, pointing to a role of trees as permanent N sinks. Stable isotope signatures of soil and vegetation indicate that N input occurs via N2 fixing microbiotic crusts and Acacia species. 30 years after clearing, SOC contained more C4 grass-derived carbon than uncleared savanna, but this shift in C source was not associated with the net C gain often observed in grasslands. Interactions between altered nutrient and C relations and composition of the understorey should be assessed in context of introduced buffelgrass (Cenchrus ciliaris) which had higher macronutrient concentrations than native grasses. Heterogeneity of the studied soils highlights the need for replication at several spatial scales to infer long-term dynamics with space-for-time chronosequences. We conclude that the techniques presented here are useful for gaining knowledge of the biogeochemical processes governing savannas and the systems that result from clearing.
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References
Baldesdent J, Mariotti A (1996) Measurement of soil organic matter turnover using 13C natural abundance. In: Boutton TW, Yamasaki S (eds) Mass spectrometry of soil. Dekker, New York, pp 83–111
Bradley RL (2001) An alternative explanation for the post-disturbance NO -3 flush in some forest ecosystems. Ecol Letters 4:412–416
Bustamante MMC, Medina E, Asner GP, Nardoto GB, Garcia-Montiel DC (2006) Nitrogen cycling in tropical and temperate savannas. Biogeochem 79:209–237
Cleveland CC, Townsend AR, Schimel DS, Fisher H, Howarth RW, Hedin LO, Perakis SS, Latty ER, von Fischer JC, Elseroad A, Wasson MF (1999) Global patterns of terrestrial biological nitrogen (N2) fixation in natural ecosystems. Global Biogeochem Cycles 13:623–645
Clewett JF, Clarkson NM, Owens DT, Arbrecht DG (1994) Australian RAINMAN, Version 2.2. Department of Primary Industries, Brisbane
Commonwealth of Australia, Department of the Environment, Water, Heritage and the Arts (2008) http://www.environment.gov.au/biodiversity/hotspots/national-hotspots.html#1 Accessed 31 Dec 2008
Cui M, Caldwell MM (1997) A large ephemeral release of nitrogen upon wetting of dry soil and corresponding responses in the field. Plant Soil 191:291–299
Dalal RC, Carter JO (2000) Soil organic matter dynamics and carbon sequestration in Australian tropical soils. In: Lal R, Kimble JM, Stewart BA (eds) Global climate change and tropical ecosystems. CRC, Boca Raton, pp 285–314
Dalal RC, Harms BP, Krull E, Wang WJ (2005) Total soil organic matter and its labile pool following mulga (Acacia aneura) clearing for pasture development and cropping 1. Total and labile carbon. Aust J Soil Res 43:13–20
D’Antonio CM, Vitousek PM (1992) Biological invasions by exotic grasses, the grass/fire cycle, and global change. Ann Rev Ecol Syst 23:63–87
EPA (2007). Regional ecosystem description database (REDD). Version 5.2, Updated Nov. 2007. Queensland Herbarium, Environmental Protection Agency, Brisbane.
Erskine PD, Stewart GR, Schmidt S, Turnbull MH, Unkovich M, Pate JS (1996) Water availability—a physiological constraint on nitrate utilisation in plants of Australian semi-arid mulga woodlands. Plant Cell Environ 19:1149–1159
Evans RD, Johansen JR (1999) Microbiotic crusts and ecosystem processes. Crit Rev Plant Sci 18:183–225
Fairfax RJ, Fensham RJ (2000) The effect of exotic pasture development on floristic diversity in central Queensland, Australia. Biol Cons 94:11–21
Fensham RJ, Holman JE (1999) Temporal and special patterns in drought-related tree dieback in Australian savanna. J Appl Ecol 36:1035–55
Fisher MJ, Rao IM, Ayarza MA, Lascano CE, Sanz JI, Thomas RJ, Vera RR (1994) Carbon storage by introduced deep-rooted grasses in the South American Savannas. Nature 371:236–238
Graham TWG, Webb AA, Waring SA (1981) Soil nitrogen status and pasture productivity after clearing of brigalow (Acacia harpophylla). Aust J Exp Agr Animal Husb 21:109–118
Guo LB, Gifford RM (2002) Soil carbon stocks and land use change: a meta analysis. Global Change Biol 8:345–360
Harms BP, Dalal RC, Cramp AP (2005) Changes in soil carbon and soil nitrogen after tree clearing in the semi-arid rangelands of Queensland. Aust J Bot 53:639–650
Handley LL, Austin AT, Robinson D, Scrimgeour CM, Raven JA, Heaton THE, Schmidt S, Stewart GR (1999) The 15N natural abundance (δ15N) of ecosystems samples reflects measures of water availability. Aust J Plant Phys 26:185–199
Högberg P (1997) Tansley review no. 95. 15N natural abundance in soil-plant systems. New Phytol 137:179–203
Henry B, Mitchell C, Cowie A, Woldring O, Carter J (2005) A regional interpretation of rules and good practise for greenhouse accounting: Northern Australian savanna systems. Aust J Bot 53:589–605
Ibarra-Flores F, Cox JR, Martin-Rivera M, Crowl TA, Norton BE (1999) Soil physicochemical changes following buffelgrass establishment in Mexico. Arid Soil Res Rehab 13:39–52
Jackson J (2005) Is there a relationship between herbaceous species richness and buffel grass (Cenchrus ciliaris)? Austral Ecol 30:505–517
Jackson J, Ash AJ (1998) Tree-grass relationships in open eucalypt woodlands of north-eastern Australia: influence of trees on pasture productivity, forage quality and species distribution. Agrofor Syst 40:159–176
Jackson J, Ash AJ (2001) The role of trees in enhancing soil nutrient availability for native perennial grasses in open eucalypt woodlands of north-east Queensland. Aust J Agr Res 52:377–386
Jacquier, D. W., Mckenzie, N. J., Brown, K. L., Isbell, R. F., Paine, T. A. (2001). The Australian soil classification—an interactive key. Version 1.0
Kaur K, Jalota RK, Midmore DJ, Rolfe J (2005) Pasture production in cleared and uncleared grazing systems of Central Queensland, Australia. Rangeland J 27:143–147
Lambers H, Raven JA, Shaver GR, Smith SE (2008) Plant nutrient-acquisition strategies change with soil age. Trends Ecol & Evol 23:95–103
Ludwig F, De Kroon H, Berendse F, Prins HHT (2004) The influence of savanna trees on nutrient, water and light availability and the understorey vegetation. Plant Ecol 170:93–105
Martin TG, Campbell S, Grounds S (2006) Weeds of Australian rangelands. Rangeland J 28:3–26
Mckenzie, N., Jacquier, D., Gregory, L., Pitman, C., Swan, G., McKenzie, A. (2007). Australian soil resource information system ASRIS (Last updated: Nov. 9, 2007). CSIRO Land and Water, Canberra. http://www.asris.csiro.au/. Accessed 25 August 2008
Neff JC, Townsend AR, Gleixner G, Lehman SJ, Turnbull J, Bowman WD (2002) Variable effects of nitrogen additions of the stability and turnover of soil carbon. Nature 419:915–917
Powers JS, Read JM, Denslow JS, Guzman SM (2004) Estimating soil carbon fluxes following land-cover change: a test of some critical assumptions for a region in Costa Rica. Global Change Biol 10:170–181
Probert ME, Williams J (1986) The nitrogen status of red and yellow earths in the semi-arid tropics as influenced by Caribbean stylo (Stylosanthes hamata) grown at various rates of applied phosphorus. Aust J Soil Res 24:405–421
R Core Team. (2007). R: A language and environment for statistical computing. R foundation for statistical computing, Vienna, Austria. http://www.R-project.org. Accessed 28 August 2008
Rayment GE, Higginson FR (1992) Australian laboratory handbook of soil and water chemicals. Inkata, Melbourne
Robinson D (2001) δ15N as an integrator of the nitrogen cycle. Trends Ecol Evol 16:153–162
Rossiter-Rachor N, Setterfield SA, Douglas MM, Hutley LB, Cook GD (2008) Andropogon gayanus (gamba grass) invasion increases fire-mediated nitrogen losses in the tropical savannas of Northern Australia. Ecosystems 11:77–88
Rossiter-Rachor NA, Setterfield SA, Douglas MM, Hutley LB, Cook GD, Schmidt S (2009) Invasive Andropogon gayanus (gamba grass) is an ecosystem transformer of nitrogen relations in Australia’s tropical savanna. Ecol Appl 19:1546–1560
Sangha KK, Jalota RK, Midmore D (2005) Impact of tree clearing on soil pH and nutrient availability in grazing systems of central Queensland, Australia. Aust J Soil Res 43:51–60
Scanlan JC (2002) Some aspects of tree-grass dynamics in Queensland’s grazing lands. Rangeland J 24:56–82
Scholes RJ, Archer SR (1997) Tree-grass interactions in savannas. Ann Rev Ecol Syst 28:517–544
Schmidt S, Stewart GR (1998) Transport, storage and mobilisation of nitrogen by trees and shrubs in the wet/dry tropics of northern Australia. Tree Phys 18:403–410
Schmidt S, Lamble RE (2002) Nutrient dynamics in Queensland savannas: implications for the sustainability of land clearing for pasture production. Rangeland J 24:96–111
Schmidt S, Stewart GR (2003) δ15N values of tropical savanna and monsoon forest species reflect root specialisations and soil nitrogen status. Oecologia 134:569–577
Schmidt S, Stewart GR, Turnbull MH, Erskine PD, Ashwath N (1998) Nitrogen relations in natural and disturbed plant communities in tropical Australia. Oecologia 117:95–105
Siddique I, Engel VL, Parrotta JA, Lamb D, Nardoto GB, Ometto JPHB, Martinelli LA, Schmidt S (2008) Dominance of legume trees alters nutrient relations in mixed species forest restoration plantings within seven years. Biogeochem 88:89–101
Sprent JI (2001) Nodulation in legumes. Royal Botanic Gardens, Kew
Stewart GR, Pate JS, Unkovich M (1993) Characteristics of inorganic nitrogen assimilation of plants in fire-prone Mediterranean-type vegetation. Plant Cell Environ 16:351–363
Thackway R, Creswell ID (1995) An interim biogeographic regionalisation for australia: A framework for setting priorities in the national reserves system cooperative program, Version 4’. Australian Nature Conservation Agency, Canberra
Thompson, E. J., Sharp, D., Kutt, A., & Morgan, G. (2003). 10.5.5 Silver-leaved ironbark open-woodland on sand plains. In: Regional ecosystems of the desert uplands factsheets. Queensland Herbarium, environmental protection agency, Brisbane. http://www.epa.qld.gov.au/media/nature_conservation/biodiversity/desert_uplands/Factsheets/100505.htm. Accessed 25 August 2008
Turner, E. J. (1978). Land systems. In: Western arid region land use study. Part IV. Technical bulletin No. 23, Department of Primary Industries, Brisbane
Vasanits A, Molnar-Perl I (1999) Temperature, eluent flow-rate and column effects on the retention and quantification properties of phenylthiocarbamyl derivatives of amino acids in reverse-phase high-performance liquid chromatography. J Chromat 832:109–122
Vourlitis GL, Pasquini S, Zorba G (2007) Plant and soil N response of southern Californian semi-arid shrublands after 1 year of experimental N deposition. Ecosyst 10:263–279
Wetselaar R, Norman MJT (1960) Recovery of available soil nitrogen by annual fodder crops at Katherine, Northern Territory. Aust J Agr Res 11:693–704
Wetselaar R (1962) Nitrate distribution in tropical soils. III. Downward movement and accumulation of nitrate in the subsoil. Plant Soil 16:19–31
Whitehead, P. J., Woinarski, J., Jacklyn, P., Fell, D., Williams, D. (2000). Defining and measuring the health of savanna landscapes: A north Australian perspective. Tropical savannas cooperative research centre, Charles Darwin University
Wilson BA, Nelder VJ, Accad A (2002) The extent and status of remnant vegetation in Queensland and its implication for statewide vegetation management and legislation. Rangeland J 24:6–35
Woinarski J (2001) A review of changes in status and threatening processes. In: Whitehead P, Woinarski J, Fisher A, Fensham JR, Beggs K (eds) Developing an analytical framework for monitoring biodiversity in Australia’s rangelands. Report for the national land and water resources audit. Tropical Savanna CRC, Darwin
Wynn JG, Bird MI (2007) C4-derived soil organic carbon decomposes faster than its C3 counterpart in mixed C3/C4 soils. Global Change Biol 13:2206–2217
Acknowledgements
This study was supported by a grant from the CRC for Tropical Savannas. We thank the owners of “Summerdell” and “Monklands” for access to their property.
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Schmidt, S., Lamble, R.E., Fensham, R.J. et al. Effect of woody vegetation clearing on nutrient and carbon relations of semi-arid dystrophic savanna. Plant Soil 331, 79–90 (2010). https://doi.org/10.1007/s11104-009-0233-5
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DOI: https://doi.org/10.1007/s11104-009-0233-5