A resource capture efficiency index to compare differences in early growth of four tree species in northern England

Leslie, Andrew; Mencuccini, Maurizio; Perks, Mike

doi:10.3832/ifor2248-010

Cited by 8 publications

(6 citation statements)

References 25 publications

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“…It should be stressed that these conclusions are from satellite-based studies at coarser resolutions and further work is needed to explore these dynamics in drone-acquired data. For specific species, the relative timing of the phenological stages matched well with previous observations, such as the early green-up of alder and hawthorn, the slower progression and late peak greenness of alder and late but rapid green-up of ash and oak tree crowns (Kuster et al, 2014;Leslie et al, 2017;Mijnsbrugge & Janssens, 2019;Vilhar et al, 2013). On the basis of individual crown PAI measurements (Fig.…”

Section: Drone-derived Phenology Metricssupporting

confidence: 87%

Monitoring spring phenology of individual tree crowns using drone‐acquired NDVI data

Fawcett

Bennie

Anderson

2020

Remote Sens Ecol Conserv

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Quantifying the timing of vegetation phenology is critical for monitoring and modelling ecosystem responses to environmental change. Phenological processes have been studied from landscape to global scales using Earth observing satellite data, and at local scale by in situ surveys of individual plants. Now, data acquired from multi-spectral sensors on drone platforms provide flexible opportunities for monitoring phenology from individual plants to small ecosystem scales efficiently, allowing community and species level information to be derived. We captured a time-series of drone-acquired normalized difference vegetation index (NDVI) data with a multi-spectral sensor (Parrot Sequoia, (Parrot, France)) over a highly heterogeneous ecosystem in Cornwall, UK, during a period of spring green-up. We monitored NDVI trajectories at the individual crown and species' level. For deciduous crowns, we derived metrics representative of spring phenological stages: Start-of-spring (SOS), middle-ofspring green-up (MOG) and start-of-peak greenness (SOP) using a logistic function. While the exact timing of SOS, MOG and SOP appeared susceptible to understorey effects and saturation of the NDVI, relative timing of green-up for a subset of species was plausible in relation to phenological observations from an extended geographic region and in situ plant area index (PAI) measurements. In evergreen vegetation (Pinus spp.) subtle changes were also detected through the growing season. The impact of illumination differences was analysed for image pairs during leaf-off and leaf-on conditions. While significant, these effects were small (mean absolute NDVI deviation of up to 0.034 for leaf-off, 0.013 for leaf-on conditions), meaning that data captured under both constant direct and diffuse irradiance conditions can be used together and that cloudy conditions should not lead to data gaps. We conclude that the capability of drone-mounted multi-spectral instruments for spatio-temporal characterization of crown-level phenology shows great promise for improving the understanding of intra-and inter-species differences in strategy, and offers an efficient means of doing so over areas of a few hectares.

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Section: Drone-derived Phenology Metricssupporting

confidence: 87%

Monitoring spring phenology of individual tree crowns using drone‐acquired NDVI data

Fawcett

Bennie

Anderson

2020

Remote Sens Ecol Conserv

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“…We also offer insights that expand the understanding of TM through a diversity lens (Festing et al, 2015;Leslie et al, 2017;Ng and Burke, 2005;Sankovich, 2014;Stahl et al, 2007;Tarique and Schuler, 2010;Tatli et al, 2013) by focusing specifically on female talent. In doing so, we shed light on the positive influence of gender diversity on organizational outcomes (Ali, 2016;Desvaux et al, 2010;Flabbi et al, 2014;Ritter-Hayashi et al, 2016).…”

Section: Conclusion Practical Implications Limitations and Directions...mentioning

confidence: 92%

“…Given the organizational, interpersonal and individual barriers faced by women in the workforce, women have been shown to benefit more than men from TM activities such as mentorship programs (Linehan and Scullion, 2008). Other studies have addressed the unequal pay between men and women (Hewlett and Rashid, 2010;Leslie et al, 2017). Gender quotas are also considered a valuable tool for promoting the inclusion of female talent (Rodr ıguez-Ruiz et al, 2016;Saeed et al, 2016;Tatli et al, 2013).…”

Section: Literature Reviewmentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%

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Gender, talent management and firm performance: MNCs' female-focused talent management practices in Russia

Latukha

Michailova

Ott

et al. 2022

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PurposeThere is a substantial void in the understanding of the effect of talent management (TM) practices specifically targeted at females on firm performance. This paper investigates the relationship between female-focused TM and firm performance with the aim of demonstrating the importance of gender diversity in firms.Design/methodology/approachThe authors developed and empirically tested a contextually embedded model using data from 103 multinational corporations in Russia to examine the effect of female-focused TM on firm performance.FindingsThe authors found an overall positive relationship between female-focused TM and firm performance. The authors’ analysis also revealed significant positive effects of female-focused talent development and talent retention, but not talent attraction, on firm performance.Originality/valueThis paper contributes to the vibrant TM scholarship by focusing on female-focused talent attraction, development and retention practices.

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“…However, these algorithms are based on empirical data and were not designed to normalise negative emissions (uptake). In addition, what drives the sources and sinks of the forest floor is often more complex; and although some models have been developed from laboratory or field studies for litter, soils and the forest floor (Greenberg et al, 2012;Mäki et al, 2017Mäki et al, , 2019b, the models may be difficult to apply outside of the studies in which they were developed. A process-based model applicable to a range of forest floor types is still lacking (Tang et al, 2019).…”

Section: Bvoc Emissions From the Forest Floormentioning

confidence: 99%

Isoprene and monoterpene emissions from alder, aspen and spruce short-rotation forest plantations in the United Kingdom

et al. 2021

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Abstract. An expansion of bioenergy has been proposed to help reduce fossil-fuel greenhouse gas emissions, and short-rotation forestry (SRF) can contribute to this expansion. However, SRF plantations could also be sources of biogenic volatile organic compound (BVOC) emissions, which can impact atmospheric air quality. In this study, emissions of isoprene and 11 monoterpenes from the branches and forest floor of hybrid aspen, Italian alder and Sitka spruce stands in an SRF field trial in central Scotland were measured during two years (2018–2019) and used to derive emission potentials for different seasons. Sitka spruce was included as a comparison as it is the most extensive plantation species in the UK. Winter and spring emissions of isoprene and monoterpenes were small compared to those in summer. Sitka spruce had a standardised mean emission rate of 15 µgCg-1h-1 for isoprene in the dry and warm summer of 2018 – more than double the emissions in 2019. However, standardised mean isoprene emissions from hybrid aspen were similar across both years, approximately 23 µgCg-1h-1, and standardised mean isoprene emissions from Italian alder were very low. Mean standardised total monoterpene emissions for these species followed a similar pattern of higher standardised emissions in the warmer year: Sitka spruce emitting 4.5 and 2.3 µgCg-1h-1 for 2018 and 2019, aspen emitting 0.3 and 0.09 µgCg-1h-1, and Italian alder emitting 1.5 and 0.2 µgCg-1h-1, respectively. In contrast to these foliage emissions, the forest floor was only a small source of monoterpenes, typically 1 or 2 orders of magnitude lower than foliage emissions on a unit of ground area basis. Estimates of total annual emissions from each plantation type per hectare were derived using the MEGAN 2.1 model. The modelled total BVOC (isoprene and monoterpenes) emissions of SRF hybrid aspen plantations were approximately half those of Sitka spruce for plantations of the same age. Italian alder SRF emissions were 20 times smaller than from Sitka spruce. The expansion of bioenergy plantations to 0.7 Mha has been suggested for the UK to help achieve net-zero greenhouse gas emissions by 2050. The model estimates show that, with such an expansion, total UK BVOC emissions would increase between <1 % and 35 %, depending on the tree species planted. Whereas increases might be small on a national scale, regional increases might have a larger impact on local air quality.

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A resource capture efficiency index to compare differences in early growth of four tree species in northern England

Cited by 8 publications

References 25 publications

Monitoring spring phenology of individual tree crowns using drone‐acquired NDVI data

Monitoring spring phenology of individual tree crowns using drone‐acquired NDVI data

Gender, talent management and firm performance: MNCs' female-focused talent management practices in Russia

Isoprene and monoterpene emissions from alder, aspen and spruce short-rotation forest plantations in the United Kingdom

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