Within-canopy variation in needle morphology and anatomy of vascular tissues in a sparse Scots pine forest

Gebauer, Roman; Čermák, Jan; Plichta, Roman; Špinlerová, Zuzana; Urban, Josef; Volařík, Daniel; Ceulemans, R.

doi:10.1007/s00468-015-1224-1

Cited by 10 publications

(6 citation statements)

References 53 publications

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“…Even though the study included only one species, this finding is important for collecting spectral libraries for use in e.g., remote sensing of conifer physiology, because it allows random sampling of needles from upper tree crowns, so that azimuth orientation does not need to be taken into account. Similar observations have been reported for morphology and anatomy parameters of Scots pine needles sampled from the southand north-oriented branches at three vertical layers (top, middle, and lower part of the canopy) [49]. Once again, branch azimuth orientation had no significant impact on studied parameters, whereas significant differences were found between the samples from different canopy vertical layers.…”

Section: Spatial Variation In Needle Spectrasupporting

confidence: 86%

Spectral Properties of Coniferous Forests: A Review of In Situ and Laboratory Measurements

Rautiainen

Lukeš²,

Homolová³

et al. 2018

Remote Sensing

112

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Abstract:Coniferous species are present in almost all major vegetation biomes on Earth, though they are the most abundant in the northern hemisphere, where they form the northern tree and forest lines close to the Arctic Circle. Monitoring coniferous forests with satellite and airborne remote sensing is active, due to the forests' great ecological and economic importance. We review the current understanding of spectral behavior of different components forming coniferous forests. We look at the spatial, directional, and seasonal variations in needle, shoot, woody element, and understory spectra in coniferous forests, based on measurements. Through selected case studies, we also demonstrate how coniferous canopy spectra vary at different spatial scales, and in different viewing angles and seasons. Finally, we provide a synthesis of gaps in the current knowledge on spectra of elements forming coniferous forests that could also serve as a recommendation for planning scientific efforts in the future.

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Section: Spatial Variation In Needle Spectrasupporting

confidence: 86%

Spectral Properties of Coniferous Forests: A Review of In Situ and Laboratory Measurements

Rautiainen

Lukeš²,

Homolová³

et al. 2018

Remote Sensing

112

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“…Thus, needle xylem structure is a key component for understanding tree hydraulic architecture. The other interesting question is how long-term phloem transport disruption influences the correlation between needle structural parameters given that anatomical traits can differ dramatically from needle to needle along a canopy (Gebauer et al 2015). These features are likely regulated by an interplay between endogenous and environmental factors (Bongard-Pierce et al 1996).…”

Section: Electronic Supplementary Materialsmentioning

confidence: 99%

How timing of stem girdling affects needle xylem structure in Scots pine

et al. 2017

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While needles represent a proportionally large fraction of whole-plant hydraulic resistance, no studies to date have investigated how source-sink disturbances affect needle xylem structure. In this study, we evaluated structural changes in xylem in current-year needles of Scots pine 227 and 411 days after stem girdling (hereafter referred to as DAG). Maximum and minimum tracheid lumen diameters and therefore also the size of tracheid lumen areas increased in needles 227 DAG compared to control needles. In contrast, tracheid dimensions were similar in needles 411 DAG as in the control needles, but smaller xylem area and lower number of tracheids resulted in the lower theoretical needle hydraulic conductivity of those needles. Several needle xylem parameters were intercorrelated in both control and girdled trees. These observed changes provide a new understanding of the processes that occur following a source-sink disturbance. Considering anatomical parameters such as the number of tracheids, tracheid dimension, or needle xylem area, which are rarely described in physiological studies, could be helpful, for example, in understanding to tree hydraulic systems or for modeling gas exchange. Finally, empirical equations were developed to calculate needle theoretical hydraulic conductivity and the number of tracheids in needles using an easily measurable parameter of needle xylem area.

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“…The stand canopy is sparse and according to assessments in 2007 the LAI was 1.31 m 2 m −2 with only two needle age classes present (Op de Beeck et al 2010). In August 2015 the stand was most recently thinned, reducing the number of trees with about one third (Gebauer et al 2015). Both the SRC plantation and the Scots pine stand host eddy covariance monitoring stations that are part of the European ICOS infrastructure network (www.icos-etc.eu).…”

Section: Description Of Sites and Plant Materialsmentioning

confidence: 99%

A comparison of different methods for assessing leaf area index in four canopy types

Ariza-Carricondo

Mauro

Beeck

et al. 2019

Central European Forestry Journal

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The agreement of Leaf Area Index (LAI) assessments from three indirect methods, i.e. the LAI–2200 Plant Canopy Analyzer, the SS1 SunScan Canopy Analysis System and Digital Hemispherical Photography (DHP) was evaluated for four canopy types, i.e. a short rotation coppice plantation (SRC) with poplar, a Scots pine stand, a Pedunculate oak stand and a maize field. In the SRC and in the maize field, the indirect measurements were compared with direct measurements (litter fall and harvesting). In the low LAI range (0 to 2) the discrepancies of the SS1 were partly explained by the inability to properly account for clumping and the uncertainty of the ellipsoidal leaf angle distribution parameter. The higher values for SS1 in the medium (2 to 6) to high (6 to 8) ranges might be explained by gap fraction saturation for LAI–2200 and DHP above certain values. Wood area index –understood as the woody light-blocking elements from the canopy with respect to diameter growth– accounted for overestimation by all indirect methods when compared to direct methods in the SRC. The inter-comparison of the three indirect methods in the four canopy types showed a general agreement for all methods in the medium LAI range (2 to 6). LAI–2200 and DHP revealed the best agreement among the indirect methods along the entire range of LAI (0 to 8) in all canopy types. SS1 showed some discrepancies with the LAI–2200 and DHP at low (0 to 2) and high ranges of LAI (6 to 8).

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Within-canopy variation in needle morphology and anatomy of vascular tissues in a sparse Scots pine forest

Abstract: Key messageAzimuthal sides of the canopy affected neither needle morphology nor vascular anatomy. However, a significant effect was found to be associated to canopy height. The needle morphological and anatomical parameters of vascular tissues were scaled up to the forest stand level.

Cited by 10 publications

References 53 publications

Spectral Properties of Coniferous Forests: A Review of In Situ and Laboratory Measurements

Spectral Properties of Coniferous Forests: A Review of In Situ and Laboratory Measurements

How timing of stem girdling affects needle xylem structure in Scots pine

A comparison of different methods for assessing leaf area index in four canopy types

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