Restoration thinning accelerates small tree growth but may slow large tree growth in a multi‐age flood‐dependent forest

Journal of Applied Ecology, Год журнала: 2024, Номер 61(7), С. 1560 - 1572

Опубликована: Май 11, 2024

Abstract Large tree decline is occurring globally with critical implications for biodiversity and carbon sequestration. Restoration thinning a potential management action to accelerate growth promote large development in forests, yet trials have been limited results mixed. We conducted large‐scale trial determine whether restoration could the of trees river red gum forests Australia that had experienced widespread woody thickening due long‐term commercial timber harvesting regulation. Thinning was on 44 9‐ha plots by removing <40 cm diameter from around retained at range spacings. Initial densities ranged ~260 ~1860 per ha 8%–86% were removed thinning. monitored 1980 prior thinning, annually 5 years post‐thinning. tested effects intensity different sized explored long‐ short‐term water availability affected outcomes. promoted small <56 diameter, especially drier sites during wet years. Higher intensities reduced rates (no smaller than 79.5 diameter) wetter sites. For medium‐ large‐sized trees, stronger drivers competition density. Synthesis applications . may young where all are small. But be ineffective or detrimental multi‐aged goal already medium size.

Язык: Английский

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Effect of diurnal solar radiation regime and tree density on sap flow of Norway spruce (Picea abies [L.] Karst.) in fragmented stand

Central European Forestry Journal, Год журнала: 2025, Номер 71(2), С. 107 - 120

Опубликована: Май 1, 2025

Abstract The continuous threat of ongoing climate change and related weather anomalies challenge forest ecosystems. phytosociological structure forests plays a crucial role in determining their resilience to various abiotic biotic stressors. Furthermore, stand density, which partly regulates the allocation resources within individual trees, is vital aspect understanding functioning. This study was conducted Norway spruce ( Picea abies [L.] Karst.) Czech Republic, where we investigated influence tree density on sap flow rates three predefined directions corresponding sun position during morning (5:00–11:10 hours; East), noon (11:10–15:10 South), evening (15:10–21:10 West) intervals. Tree calculated 10 m radius buffer around each measured using high spatial resolution aerial imagery acquired by Unmanned Aerial Vehicle. Sap at 10-minute intervals for 25 selected trees nine hottest summer days 2019. Our data reveals an inverse correlation between underscoring substantial impact neighboring transpiration. relationship most pronounced midday, followed hours, suggesting higher heat loads grounds midday. findings emphasize critical modulating functioning underscore importance maintaining specific canopy densities as part effective silvicultural practices face change.

Язык: Английский

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Quantifying effects on tree growth rates of symmetric and asymmetric inter-tree competition in even-aged, monoculture Eucalyptus pilularis forests

Trees, Год журнала: 2022, Номер 37(2), С. 239 - 254

Опубликована: Сен. 1, 2022

Abstract Key message In even-aged, monoculture eucalypt forest, symmetric inter-tree competition was far more important in determining tree growth rates than asymmetric competition. Tree size principally determined competitive ability at any time. forests, individual are much affected by the amount of resources required for (particularly light, water and nutrients) that available to them from site on which they growing. turn, those amounts between neighbouring trees. Competition may be ‘symmetric’, when directly proportional sizes, or ‘asymmetric’ vary disproportionately with sizes. Using a large data set blackbutt ( Eucalyptus pilularis Smith) forests sub-tropical eastern Australia, methods were devised quantify effects competition; as change each causes over periods few years. It found principal determinant rates. Asymmetric had lesser effects, but sufficient alter substantially development age frequency distribution is concluded time both its metabolic capabilities status and, hence, rate.

Язык: Английский

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Effect of spacing and genetic material on Eucalyptus growth for solid-wood and cellulose production in Uruguay

Floresta e Ambiente, Год журнала: 2024, Номер 31(3)

Опубликована: Янв. 1, 2024

Язык: Английский

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Predicting the upper stem diameters and volume of a tropical dominant tree species

Journal of Forestry Research, Год журнала: 2022, Номер 33(6), С. 1725 - 1737

Опубликована: Фев. 4, 2022

Abstract Predicting upper stem diameters and individual tree volumes is important for product quantification can provide information the sustainable management of forests commercial species ( Shorea robusta ) in Nepal. The aim this study was to develop a taper equation S. robusta. Fifty-four trees were selected felled southern low land A mixed effect modelling approach used evaluate 17 different functions. ‘Leave-one-out cross-validation’ validate fitted variable exponent function best our data described more than 99% variation diameters. Results also showed significant effects stand density on taper. Individual volume prediction using local model developed accurate compared predicted through existing model. provides benefit predicting diameter be any merchantable height trees. It will have implications estimates volume, biomass, carbon thus may potential supporting tool trade revenue generation.

Язык: Английский

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Tree improvement increases the growth of white spruce (Picea glauca): Evidence from 15-year-old operational plantations in Alberta

Forest Ecology and Management, Год журнала: 2024, Номер 561, С. 121855 - 121855

Опубликована: Март 29, 2024

Язык: Английский

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Enhanced awareness of height-diameter allometry in response to climate, soil, and competition in secondary forests

Forest Ecology and Management, Год журнала: 2023, Номер 548, С. 121386 - 121386

Опубликована: Сен. 8, 2023

Язык: Английский

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Investigating above- vs. below-ground competition by accounting for azimuth of competitors in native eucalypt forests

Forest Ecology and Management, Год журнала: 2023, Номер 542, С. 121103 - 121103

Опубликована: Май 18, 2023

Язык: Английский

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Effect of thinning on growth and allometry ofEucalyptus diversicolor

Southern Forests a Journal of Forest Science, Год журнала: 2022, Номер 84(4), С. 298 - 310

Опубликована: Дек. 20, 2022

AbstractKarri (Eucalyptus diversicolor F. Muell.) forest is an endemic type of southwest Western Australia (SWWA), noted for having the tallest trees in region, and providing commercial, ecological conservation value. To inform management aimed at optimising these values, a thinning trial was commenced 1992. The aim this study to evaluate effects on individual tree growth, stand level growth allometry karri even-aged stands. Mixed effect models were used compare different levels karri. We developed allometric equations modelling relationship between diameter breast height (DBH) height, tested whether affected relationship. Thinning enhanced DBH, crown width (CW) by up 149%, 56% 108% respectively heavily thinned stands, with basal area optimised retained areas 13 m2 ha−1. had significant DBH height-DBH ratio (HDR) CW. Reduction density through from below increased trees. Stand intermediate thinning. can be good tool because it may promote thereby health trees, potential benefits including accelerated development larger crowns typical mature forest.Keywords: allometrygrowthkarristand densitythinning

Язык: Английский

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Effect of diurnal solar radiation regime and tree density on sap flow of Norway spruce (Picea abies [L.] Karst.) in fragmented stands

Research Square (Research Square), Год журнала: 2023, Номер unknown

Опубликована: Авг. 21, 2023

Abstract The continuous threat of ongoing climate changes and related weather anomalies pose a significant challenge to forest ecosystems. phytosociological structure forests plays crucial role in determining their resilience various biotic abiotic stressors. Moreover, stand density, which regulates the allocation resources within individual trees, is vital aspect for comprehending functioning. This study was conducted Norway spruce located Czech Republic, where we investigated influence tree density on sap flow rates three predefined directions corresponding sun position during morning (5:00–11:10 hours; East), noon (11:10–15:10 South), evening (15:10–21:10 West) intervals. Tree calculated 10m radius buffer around each using high spatial resolution aerial imagery acquired by Unmanned Aerial Vehicle (UAV). We measured 10-minute intervals 25 selected trees nine hottest days summer 2019. normalized measures abundance foliage, qualitatively evaluated field as reverse estimate defoliation. data were used further statistical analyses. Our findings reveal strong negative correlation between underscoring substantial impact neighboring transpiration. relationship most pronounced midday, followed hours, suggesting that sparser stands experience greater water deficit. interaction incoming solar radiation may constitute factor allowing endure adapt change other stressors such bark beetle infestations.

Язык: Английский

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