Leaf area index development in temperate oak and beech forests is driven by stand characteristics and weather conditions

Bequet, Raphael; Campioli, Matteo; Kint, Vincent; Vansteenkiste, Dries; Muys, Bart; Ceulemans, R.

doi:10.1007/s00468-011-0568-4

Cited by 45 publications

(41 citation statements)

References 52 publications

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“…2a) and was supported by other seasonal LAI reports for Hesse (Barbaroux and Bréda, 2002). Prolonged leaf expansion in beech has been documented also in Northern Belgium in other years (Bequet et al, 2011). The stop in stem growth in mid-late July and the low values of stem NPP in the subsequent weeks corresponded to a drought period in 1998 (Barbaroux and Bréda, 2002).…”

Section: Seasonal Allocation Patternsupporting

confidence: 59%

“…Linear models were checked for (i) absence of multicollinearity between predictors, (ii) variation inflation factor under 1.5 for each predictor and (iii) collinearity diagnostic, with spreading of the variance proportion of each predictor on different eigenvalues. Model performance was evaluated through the explained variance (R 2 ) and the F -value of the fitted models (Bequet et al, 2011).…”

Section: Notations and Statisticmentioning

confidence: 99%

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Temporal variability of the NPP-GPP ratio at seasonal and interannual time scales in a temperate beech forest

et al. 2011

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Abstract. The allocation of carbon (C) taken up by the tree canopy for respiration and production of tree organs with different construction and maintenance costs, life span and decomposition rate, crucially affects the residence time of C in forests and their C cycling rate. The carbon-use efficiency, or ratio between net primary production (NPP) and gross primary production (GPP), represents a convenient way to analyse the C allocation at the stand level. In this study, we extend the current knowledge on the NPP-GPP ratio in forests by assessing the temporal variability of the NPP-GPP ratio at interannual (for 8 years) and seasonal (for 1 year) scales for a young temperate beech stand, reporting dynamics for both leaves and woody organs, in particular stems. NPP was determined with biometric methods/litter traps, whereas the GPP was estimated via the eddy covariance micrometeorological technique.The interannual variability of the proportion of C allocated to leaf NPP, wood NPP and leaf plus wood NPP (on average 11 % yr −1 , 29 % yr −1 and 39 % yr −1 , respectively) was significant among years with up to 12 % yr −1 variation in NPP-GPP ratio. Studies focusing on the comparison of NPP-GPP ratio among forests and models using fixed allocation schemes should take into account the possibility of such relevant interannual variability. Multiple linear regressions indicated that the NPP-GPP ratio of leaves and wood significantly correlated with environmental conditions. Previous year drought and air temperature explained about half of the NPP-GPP variability of leaves and wood, respectively, Correspondence to: M. Campioli

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Section: Seasonal Allocation Patternsupporting

confidence: 59%

Section: Notations and Statisticmentioning

confidence: 99%

Temporal variability of the NPP-GPP ratio at seasonal and interannual time scales in a temperate beech forest

et al. 2011

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“…Compared to 2016, temperatures, sunshine duration and the amount of precipitation in the study areas in spring 2015 were higher than normal [80,81]. These favourable growing conditions might have caused a better development of the tree crowns for the deciduous species [82]. According to the points mentioned in Section 4.1, a well developed crown with a high LAI would lead to a higher attenuation of the microwave energy.…”

Section: Differences Between the Investigated Yearsmentioning

confidence: 99%

Using Multitemporal Sentinel-1 C-band Backscatter to Monitor Phenology and Classify Deciduous and Coniferous Forests in Northern Switzerland

2017

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Efficient methods to monitor forested areas help us to better understand their processes. To date, only a few studies have assessed the usability of multitemporal synthetic aperture radar (SAR) datasets in this context. Here we present an analysis of an unprecedented set of C-band observations of mixed temperate forests. We demonstrate the potential of using multitemporal C-band VV and VH polarisation data for monitoring phenology and classifying forests in northern Switzerland. Each SAR acquisition was first radiometrically terrain corrected using digital elevation model-based image simulations of the local illuminated area. The flattened backscatter values and the local area values were input to a temporal compositing process integrating backscatter values from ascending and descending tracks. The process used local resolution weighting of each input, producing composite backscatter values that strongly mitigated terrain-induced distortions. Several descriptors were calculated to show the seasonal variation of European beech (Fagus sylvatica), oak (Quercus robur, Quercus petraea) and Norway spruce (Picea abies) in C-band data. Using their distinct seasonal signatures, the timing of leaf emergence and leaf fall of the deciduous species were estimated and compared to available ground observations. Furthermore, classifications for the forest types 'deciduous' and 'coniferous' and the investigated species were implemented using random forest classifiers. The deciduous species backscatter was about 1 dB higher than spruce throughout the year in both polarisations. The forest types showed opposing seasonal backscatter behaviours. At VH, deciduous species showed higher backscatter in winter than in summer, whereas spruce showed higher backscatter in summer than in winter. In VV, this pattern was similar for spruce, while no distinct seasonal behaviour was apparent for the deciduous species. The time differences between the estimations and the ground observations of the phenological events were approximately within the error margin (±12 days) of the temporal resolution. The classification performances were promising, with higher accuracies achieved for the forest types (OA of 86% and κ = 0.73) than for individual species (OA of 72% and κ = 0.58). These results show that multitemporal C-band backscatter data have significant potential to supplement optical remote sensing data for ecological studies and mapping of mixed temperate forests.

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“…According to the studies of Le Dantec et al (2000) and Campioli et al (2011), the time for the maximum LAI of French forests including Carpinus betulus L. trees was at least two months later than our study area. For another species; Fagus sylvatica L. Bequet et al (2011) identified the maximum LAI in the late June. Besides, the meteorological variables, altitude is also effective in such a delay for the foliation.…”

Section: Resultsmentioning

confidence: 99%

Ecophysiological variation of European hornbeams along the foliation period in semi-rural recreational forest landscape

Öztürk¹,

Gökyer²,

Doğan³

2016

J FAC FOR ISTANBUL U

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Cite (Atıf) : Ozturk, M., Gokyer, E., Dogan, I.A., 2016 Abstract: Determination of the ecophysiological characteristics of deciduous trees in the recreational areas allows construction of planning objectives particularly for the urban forests. Analysis of a multipurpose vegetation parameter; LAI (Leaf Area Index) together with definite meteorological variables supplies to an extent the comprehension of those ecophysiological characteristics. Around this scope, the LAI dynamics of Carpinus betulus L. trees in a recreational area were monitored and analyzed along the foliation period of approximately three months. The mean LAI which was only 0.80 during the budburst stage gradually escalated reaching 1.49 after the flushing stage. The increment of the leaves in size and numbers led to the mean LAI achieve its climax with 3.41 in early May. Then, the mean LAI experienced a stable period until the end of May. The change in the mean LAI were subjected to correlation test especially with the air and soil temperatures. The correlations between the mean LAI and, in particular the soil temperature (r≥0.95) and air temperature were high and significant (P<0.01). There were no definite correlation between the mean LAI and mean sunlight duration, air humidity and total precipitation. Impact of air temperature on the LAI of Carpinus betulus L. trees indicates the vulnerability of the recreational area to possible urban heat oriented climate warming. On the other hand, the influence of soil temperature on the mean LAI warns the susceptibility of the recreational area to possible anthropogenic pressure resulting in soil compaction and regeneration difficulties. Consequently, sustainable management of this recreational area necessitates the anticipation and mitigation of these possible destructions.Keywords: Carpinus betulus L., recreational area, canopy architecture, Leaf Area Index (LAI), hemispherical photographs. Yarı-kırsal rekreasyonel orman peyzajında yapraklanma dönemi boyunca Avrupa Gürgeninin ekofizyolojik değişimiÖzet: Rekreasyon alanlarında bulunan yaprak döken ağaçlarının ekofizyolojik özelliklerinin tespit edilmesi, bilhassa kent ormanları için planlama hedeflerinin tesis edilmesine imkân sunar. Çok amaçlı bir bitki örtüsü göstergesi olan YAİ'nin (Yaprak Alan İndisi) bazı meteorolojik değişkenlerle birlikte analiz edilmesi bu ekofizyolojik özelliklerin bir nebze anlaşılmasına yardım eder. Bu çerçevede, bir rekreasyon alanında bulunan Carpinus betulus L. ağaçlarının YAİ dinamikleri, yaklaşık üç ay süren yapraklanma dönemi boyunca izlenmiş ve analiz edilmiştir. Tomurcuklanma döneminde sadece 0.80 olan ortalama YAİ, kademeli olarak artarak yaprak verme döneminden sonra 1.49'a ulaşmıştır.

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Leaf area index development in temperate oak and beech forests is driven by stand characteristics and weather conditions

Cited by 45 publications

References 52 publications

Temporal variability of the NPP-GPP ratio at seasonal and interannual time scales in a temperate beech forest

Temporal variability of the NPP-GPP ratio at seasonal and interannual time scales in a temperate beech forest

Using Multitemporal Sentinel-1 C-band Backscatter to Monitor Phenology and Classify Deciduous and Coniferous Forests in Northern Switzerland

Ecophysiological variation of European hornbeams along the foliation period in semi-rural recreational forest landscape

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