Comparison of biomass removal, nutrient manipulation and native seed addition to restore the ground layer of a degraded grassy woodland
E. Charles Morris A C and Paul Gibson-Roy B
+ Author Affiliations
- Author Affiliations
A School of Science and Health, Hawkesbury Campus (M15), Western Sydney University, PO Box 1797, Penrith, NSW 2071, Australia.
B Greening Australia (NSW), PO Box 59, Broadway, NSW 2007, Australia.
C Corresponding author. Email: c.morris@westernsydney.edu.au
Australian Journal of Botany 66(1) 1-12 https://doi.org/10.1071/BT17091
Submitted: 23 May 2017 Accepted: 3 November 2017 Published: 19 December 2017
Abstract
This study reports on a trial of methods to overcome barriers to restoration of degraded Cumberland Plain woodland. Soil scalping was compared with fire or slashing to remove existing canopy. Fire and slashing were combined with soil carbon addition at two levels, to reduce soil nitrate. Native seed was added to overcome a lack of native propagules. Treatments, applied to 2 × 2 m plots, consisted of a control; scalped; fire and slash treatments without carbon addition; fire and slash treatments at the low and the high carbon addition levels; and a further fire and a slash treatment at the low carbon level with no native seed added, to give 10 treatments in total. Scalping eliminated the existing canopy and reduced weed seed and bud banks allowing native species (and some colonising exotics) to establish by 33 months. Rapid re-growth in the fire treatment resulted in plant canopy abundance returning to control levels by 12 months, and native species richness on burnt plots remained similar to the control. Canopy abundance in the slash treatment remained lower than in the controls for 20 months, and native species richness increased by then. Carbon addition reduced canopy re-growth in both fire and slash treatments: in the fire-low carbon plots with added native seed, native species richness was double that of the controls by 20 months. This increase did not occur on slash-low carbon plots. The highest level of carbon addition had negative effects on plant growth and survival, resulting in the lowest native species richness. The non-scalping treatments had little effect on exotic species richness in the absence of carbon or small negative effects if combined with carbon.
Additional keywords: fire, grassland restoration, native seed addition, slashing, soil carbon addition, soil scalping.
References
Anderson DR, Burnham KP, Thompson WL (2000) Null hypothesis testing: problems, prevalence and an alternative. Journal of Wildlife Management 64, 912–923.| Null hypothesis testing: problems, prevalence and an alternative.Crossref | GoogleScholarGoogle Scholar |
Anderson MJ, Gorley RN, Clarke KR (2008) ‘PERMANOVA+ for PRIMER. Guide to software and statistical methods.’ (PRIMER-E Ltd: Plymouth, England)
Bannerman SM, Hazelton PA (1990) ‘Soil landscapes of the Penrith 1 : 100 000 sheet.’ (Soil Conservation Service of NSW: Sydney)
Blumenthal DM, Jordan NR, Russelle MP (2003) Soil and carbon addition controls weeds and facilitates prairie restoration. Ecological Applications 13, 605–615.
| Soil and carbon addition controls weeds and facilitates prairie restoration.Crossref | GoogleScholarGoogle Scholar |
Borer ET, Seabloom EW, Gruner DS, et al (2014) Herbivores and nutrients control grassland plant diversity via light limitation. Nature 508, 517–520.
| Herbivores and nutrients control grassland plant diversity via light limitation.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC2cXmslaktbs%3D&md5=206507d16f9b531604ce11323f4f6687CAS |
Buisson E, Holl KD, Anderson S, Corcket E, Hayes GF, Torre F, Peteers A, Dutoit T (2006) Effect of seed source, topsoil removal and plant neighbor removal on restoring Californian coastal prairie. Restoration Ecology 14, 569–577.
| Effect of seed source, topsoil removal and plant neighbor removal on restoring Californian coastal prairie.Crossref | GoogleScholarGoogle Scholar |
Clark FR, Gorley RN (2006) ‘PRIMER V. 6. User manual/tutorial.’ (PRIMER-E Ltd: Plymouth, England)
Cole IA, Prober S, Lunt I, Koen TB (2016) Nutrient versus seed bank depletion approaches to controlling exotic annuals in threatened box gum woodlands. Austral Ecology 41, 40–52.
| Nutrient versus seed bank depletion approaches to controlling exotic annuals in threatened box gum woodlands.Crossref | GoogleScholarGoogle Scholar |
Cottingham KL, Lennon JT, Brown BL (2005) Knowing when to draw the line: designing more informative ecological experiments. Frontiers in Ecology and the Environment 3, 145–152.
| Knowing when to draw the line: designing more informative ecological experiments.Crossref | GoogleScholarGoogle Scholar |
Davies R, Christie J (2001) Rehabilitating Western Sydney’s bushland: processes needed for sustained recovery. Ecological Management & Restoration 2, 167–178.
| Rehabilitating Western Sydney’s bushland: processes needed for sustained recovery.Crossref | GoogleScholarGoogle Scholar |
Dickson TL, Foster BL (2008) The relative importance of the species pool, productivity and disturbance in regulating grassland plant species richness: a field experiment. Journal of Ecology 96, 937–946.
| The relative importance of the species pool, productivity and disturbance in regulating grassland plant species richness: a field experiment.Crossref | GoogleScholarGoogle Scholar |
Fox JR, Weisberg S (2011) ‘An R companion to applied regression.’ (2nd edn) (SAGE Publications, Inc.: Los Angeles, CA, USA)
Gibson-Roy P (2015) Western Sydney restoration updates. In ‘Grassy Groundcover Gazette’ p. 16. Available at https://www.greeningaustralia.org.au/uploads/related-downloads/15_Grassy_Groundcover_Gazette_Dec_2015.pdf [Verified 16 November 2017].
Gibson-Roy P (2016) Western Sydney restoration updates. In ‘Grassy Groundcover Gazette’ p. 19. Available at https://www.greeningaustralia.org.au/uploads/knowledge-portal/GGGazetteDecember2016.pdf [Verified 6 November 2017].
Gibson-Roy P, Delpratt J (2015) The restoration of native grasslands. In ‘Land of sweeping plains’. (Eds NSG Williams, A Marshall, JW Morgan) pp. 331–388. (CSIRO Publishing: Melbourne)
Gibson-Roy P, Delpratt CJ, Moore G (2007a) Restoring the Victorian Western (Basalt) Plains grassland. 1. Laboratory trials of viability and germination and the implications for direct seeding. Ecological Management & Restoration 8, 114–122.
| Restoring the Victorian Western (Basalt) Plains grassland. 1. Laboratory trials of viability and germination and the implications for direct seeding.Crossref | GoogleScholarGoogle Scholar |
Gibson-Roy P, Delpratt CJ, Moore G (2007b) Restoring the Victorian Western (Basalt) Plains grassland. 2. Field emergence, establishment and recruitment following direct seeding. Ecological Management & Restoration 8, 123–132.
| Restoring the Victorian Western (Basalt) Plains grassland. 2. Field emergence, establishment and recruitment following direct seeding.Crossref | GoogleScholarGoogle Scholar |
Gibson-Roy P, Delpratt CJ, Moore G, Hepworth G (2009) Does diversity influence soil nitrate, light availability and productivity in the establishment phase of Australian temperate grassland reconstruction? Ecological Management & Restoration 10, 41–50.
| Does diversity influence soil nitrate, light availability and productivity in the establishment phase of Australian temperate grassland reconstruction?Crossref | GoogleScholarGoogle Scholar |
Gibson-Roy P, Moore GM, Delpratt CJ (2010a) Testing methods for reducing weed loads in preparation for reconstructing species-rich native grassland by direct seeding. Ecological Management & Restoration 11, 135–139.
| Testing methods for reducing weed loads in preparation for reconstructing species-rich native grassland by direct seeding.Crossref | GoogleScholarGoogle Scholar |
Gibson-Roy P, Moore G, Delpratt CJ, Gardner J (2010b) Expanding horizons for herbaceous ecosystem restoration: the Grassy Groundcover Restoration Project. Ecological Management & Restoration 11, 176–186.
| Expanding horizons for herbaceous ecosystem restoration: the Grassy Groundcover Restoration Project.Crossref | GoogleScholarGoogle Scholar |
Grace JB, Anderson TM, Seabloom EW, et al (2016) Integrative modelling reveals mechanisms linking productivity and plant species richness. Nature 529, 390–393.
| Integrative modelling reveals mechanisms linking productivity and plant species richness.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC28Xns1GltA%3D%3D&md5=ebcdca2e9c1ef288362aa02c3289c267CAS |
Harden GJ (ed.) (1991–1993) ‘Flora of NSW. Vols 1–4.’ (University of New South Wales Press: Sydney)
Hermann J, Conradi T (2012) Calcareous grasslands in the north of Munich: what are our targets in restoration? How can we achieve our targets? In ‘Scientific bases for grassland restoration in southern Brazil’. (DFG-CNPq German-Brazilian workshop: Munich, Germany)
Hill SJ, French K (2004) Potential impacts of fire and grazing in an endangered ecological community: plant composition and shrub and eucalypt regeneration in Cumberland Plain Woodland. Australian Journal of Botany 52, 23–29.
| Potential impacts of fire and grazing in an endangered ecological community: plant composition and shrub and eucalypt regeneration in Cumberland Plain Woodland.Crossref | GoogleScholarGoogle Scholar |
Lunt ID, Morgan JW (1999) Vegetation changes after 10 years of grazing exclusion and intermittent burning in a Themeda triandra (Poaceae) grassland reserve in south-eastern Australia. Australian Journal of Botany 47, 537–552.
| Vegetation changes after 10 years of grazing exclusion and intermittent burning in a Themeda triandra (Poaceae) grassland reserve in south-eastern Australia.Crossref | GoogleScholarGoogle Scholar |
Lunt ID, Morgan JW (2002) ‘The role of fire regimes in temperate lowland grasslands of south-eastern Australia’. In ‘Flammable Australia: the fire regimes and biodiversity of a continent’. (Eds RA Bradstock JE Williams, MA Gill) pp. 177–198 (Cambridge University Press: Melbourne)
McIntyre A, Cunningham RB, Donnelly CF, Manning AD (2014) Restoration of eucalypt grassy woodland: effects of experimental interventions on ground-layer vegetation. Australian Journal of Botany 62, 570–579.
| Restoration of eucalypt grassy woodland: effects of experimental interventions on ground-layer vegetation.Crossref | GoogleScholarGoogle Scholar |
Morgan JW (2015) Biomass management in native grasslands. In ‘Land of sweeping plains’. (Eds NSG Williams, A Marshall, JW Morgan) pp. 201–222. (CSIRO Publishing: Melbourne)
Morgan JW, Williams NSG (2015) The ecology and dynamics of temperate native grasslands in south-eastern Australia. In ‘Land of sweeping plains’. (Eds NSG Williams, A Marshall, JW Morgan) pp. 61–86. (CSIRO Publishing: Melbourne)
Morris EC, de Barse M (2013) Carbon, fire and seed addition favour native over exotic species in a grassy woodland. Austral Ecology 38, 413–426.
| Carbon, fire and seed addition favour native over exotic species in a grassy woodland.Crossref | GoogleScholarGoogle Scholar |
Morris EC, de Barse M, Sanders J (2016) Effect of burning and rainfall on former agricultural land with remnant woodland flora. Austral Ecology 41, 74–86.
| Effect of burning and rainfall on former agricultural land with remnant woodland flora.Crossref | GoogleScholarGoogle Scholar |
Nichols PBW, Morris EC, Keith DA (2010) Testing a facilitation model for ecosystem restoration: does tree planting restore ground layer species in a grassy woodland? Austral Ecology 35, 888–897.
| Testing a facilitation model for ecosystem restoration: does tree planting restore ground layer species in a grassy woodland?Crossref | GoogleScholarGoogle Scholar |
Perry LG, Blumenthal DM, Monaco TA, Paschke MW, Redente EF (2010) Immobilizing nitrogen to control plant invasion. Oecologia 163, 13–24.
| Immobilizing nitrogen to control plant invasion.Crossref | GoogleScholarGoogle Scholar |
Prober SM, Thiele KR, Lunt ID, Koen TB (2005) Restoring ecological function in temperate grassy woodlands: manipulating soil nutrients, exotic annuals and native perennial grasses through carbon supplements and spring burns. Journal of Applied Ecology 42, 1073–1085.
| Restoring ecological function in temperate grassy woodlands: manipulating soil nutrients, exotic annuals and native perennial grasses through carbon supplements and spring burns.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD28Xkt1aiuw%3D%3D&md5=3d6357d20b8a86cccedf282b969deaceCAS |
Prober SM, Thiele KR, Speijers J (2013) Management legacies shape decadal-scale responses of plant diversity to experimental disturbance regimes in fragmented grassy woodlands. Journal of Applied Ecology 50, 376–386.
| Management legacies shape decadal-scale responses of plant diversity to experimental disturbance regimes in fragmented grassy woodlands.Crossref | GoogleScholarGoogle Scholar |
Prober SM, Thiele KR, Speijers J (2016) Competing drivers lead to non-linear native-exotic relationships in endangered temperate grassy woodlands. Biological Invasions 18, 3001–3014.
| Competing drivers lead to non-linear native-exotic relationships in endangered temperate grassy woodlands.Crossref | GoogleScholarGoogle Scholar |
R Development Core Team (2016). ‘R: A language and environment for statistical computing’. (R Foundation for Statistical Computing, Vienna, Austria) Available at http://www.R-project.org/ [Verified 6 November 2017].
Rasran L, Vogt KA, Jensen K (2007) Effects of topsoil removal, seed transfer with plant material and moderate grazing on restoration of riparian fen grasslands. Applied Vegetation Science 10, 451–460.
| Effects of topsoil removal, seed transfer with plant material and moderate grazing on restoration of riparian fen grasslands.Crossref | GoogleScholarGoogle Scholar |
Seabloom EW, Borer ET, Buckley YM, et al (2015) Plant species’ origin predicts dominance and response to nutrient enrichment and herbivores in global grasslands. Nature Communications 6, 7710
| Plant species’ origin predicts dominance and response to nutrient enrichment and herbivores in global grasslands.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC2MXhtlWhurjK&md5=e3c4455416961794c1e3eec8e4b5807fCAS |
Sokal RR, Rohlf FJ (1995) ‘Biometry.’ (3rd edn) (WH Freeman and Company: New York)
Suding KN, Hobbs RJ (2009) Models of ecosystem dynamics as frameworks for restoration ecology. In ‘New models for ecosystem dynamics and restoration’. (Eds RJ Hobbs, KN Suding) pp. 3–21. (Island Press: London)
Tozer M (2003) The native vegetation of the Cumberland Plain, western Sydney: systematic classification and field identification of communities. Cunninghamia 8, 1–75.
Tozer MG, Leishmann MR, Auld TD (2015) Ecosystem risk assessment for Cumberland Plain Woodland, New South Wales, Australia. Austral Ecology 40, 400–410.
| Ecosystem risk assessment for Cumberland Plain Woodland, New South Wales, Australia.Crossref | GoogleScholarGoogle Scholar |
Veldman JW, Buisson E, Durigan G, Fernandes GW, Le Stradic S, Mahy G, Negreiros D, Overbeck GE, Veldman RG, Zaloumis NP, Putz FE, Bond WJ (2015) Toward an old-growth concept for grasslands, savannas and woodlands. Frontiers in Ecology and the Environment 13, 154–162.
| Toward an old-growth concept for grasslands, savannas and woodlands.Crossref | GoogleScholarGoogle Scholar |
Verhagen R, Klooker J, Bakker JP, van Diggelen R (2001) Restoration success of low-production plant communities on former agricultural soils after top-soil removal. Applied Vegetation Science 4, 75–82.
| Restoration success of low-production plant communities on former agricultural soils after top-soil removal.Crossref | GoogleScholarGoogle Scholar |
Wilkins S, Keith DA, Adam P (2003) Measuring success: evaluating the restoration of a grassy Eucalypt woodland on the Cumberland Plain, Sydney, Australia. Restoration Ecology 11, 489–503.
| Measuring success: evaluating the restoration of a grassy Eucalypt woodland on the Cumberland Plain, Sydney, Australia.Crossref | GoogleScholarGoogle Scholar |
