Resilience of a native soil seed bank in a floodplain lake subjected to cropping, grazing and extended drought
Jeffrey J. Kelleway
A B C , Jordan A. Iles A D , Tsuyoshi Kobayashi A and Joanne E. Ling A E
+ Author Affiliations
- Author Affiliations
A Science, Economics and Insights Division, Department of Planning, Industry and Environment, PO Box 29, Lidcombe, NSW 1825, Australia.
B School of Earth, Atmospheric and Life Sciences, University of Wollongong, Northfields Avenue, Wollongong, NSW 2522, Australia.
C GeoQuEST Research Centre, University of Wollongong, Northfields Avenue, Wollongong, NSW 2522, Australia.
D Centre for Tropical Water and Aquatic Research (TropWater), James Cook University, Townsville Qld 4811, Australia.
E Corresponding author. Email: joanne.ling@environment.nsw.gov.au
Marine and Freshwater Research 72(6) 787-799 https://doi.org/10.1071/MF19386
Submitted: 9 December 2019 Accepted: 14 September 2020 Published: 15 December 2020
Abstract
Ephemeral floodplain lakes are an integral component of inland wetland ecosystems and experience highly variable hydrology and prolonged dry periods. Although wetland soil seed banks are highly resilient to drought and floods, anthropogenic land use may add an additional stress. Understanding the recovery potential of wetland soil seed banks to different historical land uses helps manage and prioritise environmental water. In this study we explored the resilience of the wetland plant community in an ephemeral floodplain lake (Ita Lake, NSW, Australia). We collected soil samples during an extended dry phase (10 years) from two distinct zones within the lake, one of which was subjected to historical grazing and the other to lakebed ploughing and cropping. The samples were inundated under multiple inundation regimes to assess soil seed bank response. We found that the soil seed bank was viable, indicating a level of resilience not previously recorded for some plant species, namely Ricciocarpus natans, Chara spp., Nitella spp., Alternanthera denticulata and Eleocharis acuta. Although the results highlight the resilience of ephemeral wetland plant communities, intensive land uses such as ploughing and cropping will limit the availability of seeds to germinate, and the inundation regime will influence species composition and the subsequent likelihood of restoration.
Keywords: aquatic vegetation, environmental water, historical land use, Ita Lake, Lachlan wetlands, wetland seed viability.
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