Changes in microhabitat, but not allelopathy, affect plant establishment after<i>Acacia dealbata</i>invasion

Lorenzo, Paula; Rodríguez, Jonatan; González, Luís; Rodríguez‐Echeverría, Susana

doi:10.1093/jpe/rtw061

Cited by 19 publications

(16 citation statements)

References 37 publications

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“…The general unresponsiveness of native seedlings to altered soil chemistry has also been observed with other invasive species (e.g. Psidium cattleianum, Macaranga mappa, Falcataria moluccana Melastoma septemnervium and Clidemia hirta; Ostertag et al, 2009;and Acacia dealbata;Lorenzo et al, 2017). However, our results conflict with the findings of Witkowski (1991) which suggested that P. repens seedlings displayed an increase in growth in response to increased nutrient availability.…”

Section: Discussioncontrasting

confidence: 86%

Re-establishment of Protea repens after clearing invasive Acacia saligna: Consequences of soil legacy effects and a native nitrophilic weedy species

Nsikani

Wilgen

Bacher

et al. 2018

South African Journal of Botany

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Invasive Australian acacias can alter soil chemistry and microbial communities in areas they invade. After clearing invasive acacias, these changes can persist, and previously invaded areas can become dominated by nitrophilic weedy species. Restoration of viable native plant communities in cleared sites often fails due to a lack of native species re-establishment. Therefore, to improve restoration outcomes, it is important to understand the effects of soil chemical and biotic legacies, and of nitrophilic weedy species, on native species re-establishment. To investigate the effect of soil chemical legacies, we germinated and grew Protea repens seedlings (a native proteoid shrub) as an indicator species in soil taken from areas cleared of Acacia saligna in lowland fynbos, as well as from non-invaded areas under controlled conditions. To investigate the effect of soil biotic legacies, we sterilized half the soil from each cleared or non-invaded area. We grew Ehrharta calycina (a native nitrophilic weedy grass species) in half of each treatment and measured the effect of treatments on P. repens germination and growth. Germination percentage, root and shoot dry mass of P. repens did not significantly differ between altered and native soil chemistry. The germination percentage of P. repens was significantly greater (93%) in the presence of soil microbial communities than in their absence. The presence of E. calycina significantly increased (29%) the root-to-shoot ratio of P. repens than their absence. Since the legacy of altered soil chemistry did not have a direct negative effect on P. repens germination and growth; we conclude that restoration efforts do not always have to manage altered soil chemistry after clearing invasive A. saligna.

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Section: Discussioncontrasting

confidence: 86%

Re-establishment of Protea repens after clearing invasive Acacia saligna: Consequences of soil legacy effects and a native nitrophilic weedy species

Nsikani

Wilgen

Bacher

et al. 2018

South African Journal of Botany

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“…In, volatile organic compounds (VOCs) released by A. dealbata flowers reduced germination and growth of its own seedlings (Souza-Alonso et al 2014a). Despite the evidence of allelopathy under controlled conditions, the allelopathic effect was not detected at field scale, suggesting a negligible role of allelopathy during the invasive process of A. dealbata, at least in the European range (Lorenzo et al 2016a;Souza-Alonso et al under review).…”

Section: A Clear Role Of Allelopathy?mentioning

confidence: 96%

“…Schematic representation of the main processes that take place under Acacia invasion and links to the main sections and references included in the manuscript 3.1 Aboveground effects3.1.1 Structural changesInvasive acacias create homogeneous and dense-vegetation formations (Le, which drastically decrease light availability for understory plants hindering their establishment(Lorenzo et al 2010a;Rascher et al 2011a;Lorenzo et al 2016a). In fact,Fuentes-Ramírez et al (2011) found a lower survival of light-demanding native forest species vs.…”

mentioning

confidence: 99%

Here to stay. Recent advances and perspectives about Acacia invasion in Mediterranean areas

Souza‐Alonso

Rodríguez

González

et al. 2017

Annals of Forest Science

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Key message The above-and belowground impacts due to Acacia invasions have been described in detail over the last 25 years. Future research should focus on the early detection and prevention of new Acacia introductions and on a cost-effective and sustainable management of the novel ecosystems resulting from invasions.• Context Invasive alien plants (IAPs) strongly alter ecosystems reducing biodiversity, modifying ecosystem services and increasing negative impacts at social and economic level. Among invasive taxa, Acacia is a highly problematic genus worldwide. In fact, almost 500 papers have been published on several aspects of Acacia invasions for the last 25 years.• Aims We aim at reviewing the current knowledge on the consequences of the invasion by Acacia genus in Mediterranean ecosystems. We also collect and propose different approaches for the management and recovery of invaded areas and suggest future perspectives on Acacia research. • Methods We compile, summarise and discuss recent findings on physicochemical, ecological, microbiological and socioeconomic aspects of invasion related to Australian acacias (Acacia dealbata, Acacia longifolia, Acacia mearnsii, Acacia saligna and Acacia melanoxylon) focusing on Mediterranean areas.• Results Acacia invasion generally entails soil physicochemical alterations and changes in microbial function and structure. Consequences such as the decreased biodiversity, altered ecosystem structure, larger seed banks dominated by invasive species, new biotrophic relationships or alterations in water availability and fire regimes suggest that acacias are locally creating novel ecosystems.• Conclusions Forecasting invasions, modelling and managing ecosystems dominated by acacias are challenging tasks that should be addressed in the future, since climatic conditions and intensification in land uses are increasing the likelihood of Acacia invasions in Mediterranean areas. Unsuccessful management actions suggest that restoration should be meticulously monitored, but the magnitude of invasion or the inconsistency of economic investment indicate that eradication is often unfeasible. Alternatively, novel integrative and cost-effective solutions including the collaboration of society, politicians and stakeholders are necessary to prevent new introductions and achieve sustainable control of acacias. There is a growing interest in applied research on the valorisation or novel uses for acacias and their residues that result in economic benefits.

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“…Acacia spp. are effective in utilising available resources more efficiently and may therefore outcompete native species by altering local conditions [80][81][82]. However, the value and use of IAPs as an ecosystem service is reducing in the study areas due to increased rural-urban migration and the increase in number of households supplied with electricity [83].…”

Section: Discussionmentioning

confidence: 99%

Monitoring Effects of Land Cover Change on Biophysical Drivers in Rangelands Using Albedo

Münch

Gibson²,

Palmer

2019

Land

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This paper explores the relationship between land cover change and albedo, recognized as a regulating ecosystems service. Trends and relationships between land cover change and surface albedo were quantified to characterise catchment water and carbon fluxes, through respectively evapotranspiration (ET) and net primary production (NPP). Moderate resolution imaging spectroradiometer (MODIS) and Landsat satellite data were used to describe trends at catchment and land cover change trajectory level. Peak season albedo was computed to reduce seasonal effects. Different trends were found depending on catchment land management practices, and satellite data used. Although not statistically significant, albedo, NPP, ET and normalised difference vegetation index (NDVI) were all correlated with rainfall. In both catchments, NPP, ET and NDVI showed a weak negative trend, while albedo showed a weak positive trend. Modelled land cover change was used to calculate future carbon storage and water use, with a decrease in catchment carbon storage and water use computed. Grassland, a dominant dormant land cover class, was targeted for land cover change by woody encroachment and afforestation, causing a decrease in albedo, while urbanisation and cultivation caused an increase in albedo. Land cover map error of fragmented transition classes and the mixed pixel effect, affected results, suggesting use of higher-resolution imagery for NPP and ET and albedo as a proxy for land cover.

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Changes in microhabitat, but not allelopathy, affect plant establishment afterAcacia dealbatainvasion

Cited by 19 publications

References 37 publications

Re-establishment of Protea repens after clearing invasive Acacia saligna: Consequences of soil legacy effects and a native nitrophilic weedy species

Re-establishment of Protea repens after clearing invasive Acacia saligna: Consequences of soil legacy effects and a native nitrophilic weedy species

Here to stay. Recent advances and perspectives about Acacia invasion in Mediterranean areas

Monitoring Effects of Land Cover Change on Biophysical Drivers in Rangelands Using Albedo

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