Leaf litter of two riparian tree species has contrasting effects on nutrients leaching from soil during large rainfall e
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Leaf litter of two riparian tree species has contrasting effects on nutrients leaching from soil during large rainfall events Hannah M. Franklin & Chenrong Chen & Anthony R. Carroll & Emily Saeck & Paul Fisher & Michele A. Burford
Received: 7 May 2020 / Accepted: 15 September 2020 # Springer Nature Switzerland AG 2020
Abstract Background and aims One goal of revegetating riparian zones is to mitigate nutrient movement into waterways, however release of dissolved nutrients and organic compounds from decaying leaf litter
Editorial Responsibility: Feike A. Dijkstra Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11104-020-04721-y) contains supplementary material, which is available to authorized users. H. M. Franklin (*) : C. Chen : M. A. Burford Australian Rivers Institute, Griffith University, Nathan, Brisbane, Queensland 4111, Australia e-mail: [email protected] e-mail: [email protected] C. Chen : M. A. Burford School of Environment and Sciences, Griffith University, Nathan, Brisbane, Queensland 4111, Australia A. R. Carroll Environmental Futures Research Institute, Griffith University, Southport, Gold Coast, Queensland 4222, Australia A. R. Carroll Griffith Institute for Drug Discovery, Griffith University, Nathan, Brisbane, Queensland 4111, Australia E. Saeck Healthy Land and Water, Brisbane City, Brisbane, Queensland 4111, Australia P. Fisher Seqwater, Ipswich, Queensland 4305, Australia
during rainfall may partially offset these benefits. We aim to understand how litter-derived nutrients and organics affect nutrient leaching from riparian soil, and how tree species affect these processes. Methods In the laboratory we simulated large rainfall events through the leaf litter of two riparian woody tree species, Eucalyptus tereticornis and Casuarina cunninghamiana, with and without subsequent leaching through soil, as well as soil alone. We compared the forms and loads of nitrogen and phosphorus in leachate. Results Litter of both tree species stimulated additional nitrate release from soil (~100–200%) compared to bare soil. More ammonium and dissolved organic nitrogen also leached from soil with E. tereticornis litter, whereas less leached with C. cunninghamiana litter. More phosphate leached from soil with either species litter compared to bare soil. Increased nitrogen releases from soil with litter were greater than inputs from litter, suggesting they are driven by positive priming of soil microbial processes, whereas litter inputs increased phosphorus leaching. Conclusions This information could be combined with rates of other riparian nutrient processes (e.g. plant uptake and denitrification) to quantify the net impact of trees on nutrient retention in riparian zones.
Keywords Catchment restoration . Inorganic . Organic . Nitrogen . Phosphorus . Water quality
Plant Soil
Introduction Widespread vegetation clearance and increased inputs of nitrogen (N) and phosphorus (P) to agricultural land have greatly increased nutrient a
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