Effects of thinning intensities on tree water use, growth, and resultant water use efficiency of 50-year-old Pinus koraiensis forest over four years

Park, Juhan; Kim, Taegyu; Moon, Minkyu; Cho, Sungsik; Ryu, Dong-Woo; Kim, Hyun‐Seok

doi:10.1016/j.foreco.2017.09.031

Cited by 64 publications

(40 citation statements)

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“…forests (Fernandes et al, 2016;Forrester et al, 2012;Gebhardt et al, 2014), by observing the enhanced tree transpiration accompanied with a higher increase of tree growth. Besides, Park et al (2018) found that the significant difference of treelevel WUE between the heavy thinning and the control stands occurred only in high growth years in a 50-year-old Korean pine (Pinus koraiensis) stands. The enhancement of tree-level WUE was mainly attributed to a lower water stress under a more intense thinning treatment (Cabon et al, 2018;del Campo et al, 2014;Gebhardt et al, 2014;Park et al, 2018).…”

Section: Discussionmentioning

confidence: 94%

“…Besides, Park et al (2018) found that the significant difference of treelevel WUE between the heavy thinning and the control stands occurred only in high growth years in a 50-year-old Korean pine (Pinus koraiensis) stands. The enhancement of tree-level WUE was mainly attributed to a lower water stress under a more intense thinning treatment (Cabon et al, 2018;del Campo et al, 2014;Gebhardt et al, 2014;Park et al, 2018). Therefore, the effects of thinning on tree-level WUE depend on how thinning releases tree competition for resources (e.g.,…”

Section: Discussionmentioning

confidence: 94%

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Responses of Forest Carbon and Water Coupling to Thinning Treatments Across Multiple Spatial Scales

Wang¹,

Campo²,

Wei³

et al. 2020

Preprint

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BackgroundWater-use efficiency (WUE) represents the coupling of forest carbon and water. Little is known about the responses of WUE to thinning at multiple spatial scales. The objective of this research was to use field measurements to understand short-term effects of two thinning treatments (T1: 4,500 stems ha-1; and T2: 1,100 stems ha-1) and the control (C: 27,000 stems ha-1) on WUE (the ratio of leaf photosynthesis to leaf transpiration, or tree growth to tree transpiration, or net stand above-ground biomass (AGB) accumulation to stand transpiration) and the intrinsic WUE (WUEi, the ratio of leaf photosynthesis to stomatal conductance or the net stand AGB accumulation to canopy conductance) in a 16-year old natural lodgepole pine forest. Leaf-level measurements were conducted in 2017, while tree- and stand-level measurements were conducted in both 2016 (the normal year) and 2017 (the drought year).ResultsThere was no significant effect of thinning on the tree- and stand-level WUE in 2016, while in 2017, only T2 exhibited significantly higher tree-level WUE (0.63 mm2 kg-1) than the C (0.06 mm2 kg-1), and the stand-level WUE values were significantly higher in the thinned stands, with the means of 0.34, 0.61 and 0.7 kg m-3 for the control, T1 and T2, respectively. Stand-level WUEi was, however, significantly higher in the unthinned stands than in the thinned stands. In contrast, the leaf-level WUE values were not significantly different from each other, while the leaf-level WUEi was statistically higher in C than in the thinned stands. Thinning changed the WUE-VPD relationships at tree and stand levels, but not at the leaf level.Conclusions The effects of thinning on forest carbon and water coupling differed with the spatial scales and the metrics (WUE or WUEi) of water use efficiency. Lacking consistent reponses of WUE metrics to thinning treatments across the spatial scales suggests that caution must be exercised when transferring and modeling WUE from one spatial scale to others. Both tree-level and stand-level WUE values in the more heavily thinning stands were significantly promoted under the drough condition, demonstrating that thinning can improve WUE and consequently support forests to cope with the drought effects.

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Section: Discussionmentioning

confidence: 94%

Section: Discussionmentioning

confidence: 94%

Responses of Forest Carbon and Water Coupling to Thinning Treatments Across Multiple Spatial Scales

Wang¹,

Campo²,

Wei³

et al. 2020

Preprint

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“…Forest fuel treatments are a common management practice in Sierra Nevada forests for many reasons, including wildlife habitat protection, fire risk exclusion, and drought stress release (Knapp et al, 2013(Knapp et al, , 2017Park et al, 2018;Battles et al, 2001;Stephens et al, 2009). Depending on the purposes, fuel treatments can be achieved in many ways.…”

Section: Uncertainties Related To Different Treatmentsmentioning

confidence: 99%

“…Selective removal of forest fuels (i.e. fuel treatment) is a widely used forest management and restoration practice with both economic and ecological goals (Agee and Skinner, 2005;Kerr and Haufe, 2011;Mitchell et al, 2009;Park et al, 2018). In the Sierra Nevada, California, forest fuel treatments including logging, thinning, and mastication have been conducted for many years (Knapp et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Evaluating the uncertainty of Landsat-derived vegetation indices in quantifying forest fuel treatments using bi-temporal LiDAR data

Lai-ping

et al. 2018

Ecological Indicators

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A B S T R A C TForest ecosystems in the American west have long been influenced by timber harvests and fire suppression, and recently through treatments that reduce fuel for fire management. Precisely quantifying the structural changes to forests caused by fuel treatments is an essential step to evaluate their impacts. Satellite imagery-derived vegetation indices, such as the normalized difference vegetation index (NDVI), have been widely used to map forest dynamics. However, uncertainties in using these vegetation indices to quantify forest structural changes have not been thoroughly studied, mainly due to the lack of wall-to-wall validation data. In this study we generated forest structural changes in aboveground biomass (AGB) and canopy cover as a result of fuel treatments using bitemporal airborne light detection and ranging (LiDAR) data and field measurements in a mixed coniferous forest of northern Sierra Nevada, California, USA. These LiDAR-derived forest structural measures were used to evaluate the uncertainties of using Landsat-derived vegetation indices to quantify treatments. Our results confirmed that vegetation indices can accurately map the extents of forest disturbance and canopy cover changes caused by fuel treatments, but the accuracy in quantifying AGB changes varied by the pre-treatment forest densities and treatment intensity. Changes in vegetation indices had relatively weaker correlations (coefficient of determination < 0.45) to biomass changes in forests with sparse (AGB < 100 Mg/ha) or dense biomass (AGB > 700 Mg/ha), than in forests with moderate-density (AGB between 100 Mg/ha and 700 Mg/ha) before the disturbances. Moreover, understory treatments (canopy height < 10 m) were poorly indicated by changes in satellite-derived vegetation indices. Our results suggest that when relating vegetation indices to AGB changes, researchers and managers should be cautious about their uncertainties in extremely dense or sparse forests, particularly when treatments mainly removed small trees or understory fuels. Tempel et al., 2014). Because these management practices are so impactful on forest structure, accurate measurement of the changes to forest structure as a result of fuel treatments is necessary, but doing so remains challenging. Accurate and timely quantification of forest changes in abundance, production, and spatial pattern is a necessary step for forest fuel treatment evaluation (Huang et al., 2009;Su et al., 2016a). Traditional (M. Kelly).Ecological Indicators 95 (2018) 298-310 1470-160X/

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“…Because of the thinning intensity, the increase in diameter may promote changes in consumption and efficiency of water use by trees, which occur in function of the water availability in the environment and the capacity of the arboreous species adaptation (PARK et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

DIAMETRIC GROWTH AND PROPERTIES OF Copaifera langsdorffii DESF. BY SECOND CUTTING CYCLE

Carmo

Latorraca

Santos

et al. 2018

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The aim of this study was to analyze forest management effects in the diametric growth and wood anatomical, chemical and physical properties of Copaifera langsdorffii trees, in an Ombrophilous Open Forest (state of Mato Grosso, Brazil). The forest management effects were determined through a comparative study between the wood properties of 10 years before and 10 years after the first logging, in 1987. Multivariate associations among the anatomical characteristics, macro and micronutrient, wood density, and current annual increment (ICA) were evaluated to every growth period through the two steps cluster analysis. The results indicated that the following characteristics were relevant to distinct the periods studied: ICA, vessel frequency, and wood density. C. langsdorffii respond to stimuli caused by forest management, adapting to the increase of resources availability, due to the opening gaps, and showing growth increase with reduction of wood density, which may indicate variations on the wood properties. Keywords: Wood quality, forest management, tropical wood. ResumoCrescimento diamétrico e propriedades do lenho de Copaifera langsdorffi desf. De segundo ciclo de corte. O objetivo do presente estudo foi analisar os possíveis efeitos do manejo florestal no crescimento diamétrico e nas propriedades anatômicas, químicas e físicas da madeira de Copaifera langsdorffii, em Floresta Ombrófila Aberta (Mato Grosso, Brasil). O efeito do manejo florestal foi determinado por meio de um estudo comparativo entre as características tecnológicas do lenho correspondente a dez anos antes e dez anos após a primeira exploração, ocorrida em 1987. Foram avaliados: associações multivariadas entre as características anatômicas, macro e micronutrientes, densidade aparente e incremento corrente anual (ICA), em cada período analisado, por meio de análise de cluster em duas etapas. Os resultados indicaram que as seguintes características foram relevantes para a distinção dos períodos estudados: ICA, frequência de vasos e densidade da madeira. Diante dos resultados obtidos, pode-se concluir que a espécie arbórea C. langsdorffii responde aos estímulos provocados pelo manejo florestal, adaptando-se ao aumento da disponibilidade de recursos decorrentes da abertura de clareiras e apresentando ganhos de incremento com redução na densidade, o que pode indicar adaptações das propriedades da madeira. Palavras-chave: Qualidade da madeira, exploração florestal, madeira tropical.

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Effects of thinning intensities on tree water use, growth, and resultant water use efficiency of 50-year-old Pinus koraiensis forest over four years

Cited by 64 publications

References 59 publications

Responses of Forest Carbon and Water Coupling to Thinning Treatments Across Multiple Spatial Scales

Responses of Forest Carbon and Water Coupling to Thinning Treatments Across Multiple Spatial Scales

Evaluating the uncertainty of Landsat-derived vegetation indices in quantifying forest fuel treatments using bi-temporal LiDAR data

DIAMETRIC GROWTH AND PROPERTIES OF Copaifera langsdorffii DESF. BY SECOND CUTTING CYCLE

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