Ecosystem service and biodiversity trade-offs in two woody successions

Dickie, Ian and Yeates, Gregor and St John, Mark and Stevenson, Bryan and Scott, John and Rillig, Matthias and Peltzer, Duane and Orwin, Kate and Kirschbaum, Miko and Hunt, John and Burrows, Larry and Barbour, Margaret and Aislabie, Jackie (2011) Ecosystem service and biodiversity trade-offs in two woody successions. Journal of Applied Ecology, 48 (4). pp. 926-934. ISSN 0021-8901

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1. Many grasslands worldwide are undergoing succession to woody vegetation, causing complex effects on carbon (C) sequestration, nutrient cycling and biodiversity. Land managers are frequently tasked with maximizing ecosystem services and biodiversity. Nonetheless, there are few studies quantifying trade-offs between ecosystem services and biodiversity during early woody succession. 2. We assessed the consequences of woody succession for C stocks, above-and below-ground taxa richness (plants, nematodes, mites, microbes, fungi), and soil ecosystem function at one site with a native tree, Kunzea ericoides, and one site with a non-native tree, Pinus nigra, both establishing in conservation grasslands. 3. Woody succession at both sites was associated with large gains in above-ground C stocks and, under P. nigra, losses from the mineral soil-C pool. 4. Taxa richness responses were complex, nonlinear and incongruent. While some taxa showed initial increases in richness with woody succession (e. g. plants), other taxa had rapid declines (e. g. plant-feeding and plant-associated nematodes, oribatid mites). 5. Below-ground ecosystem functioning shifted towards increased bacterial energy channels with woody succession, despite no change in bacterial or fungal biomass or fungal hyphal lengths. Most other soil measures were consistent with literature expectations (increased C: N ratios, release of recalcitrant phosphorus). 6. Synthesis and applications. Our gradient-based measurements of woody succession effects on ecosystems did not follow expectations based on comparing end-points of grasslands to homogeneous mature forest. The discordance of biodiversity responses across taxonomic groups suggests that managers cannot rely on the indicator-species concept to ensure conservation of cryptic biodiversity. Carbon sequestration and biodiversity followed non-congruent patterns, with significant losses of taxa richness from some functional groups during woody succession. Management to maximize individual ecosystem services such as carbon sequestration may therefore result in significant negative effects on biodiversity of some, but not all, taxa.

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Journal Article
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Journal of Applied Ecology
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22 Jul 2011 09:42
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20 Sep 2023 00:15