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Tree species identity and interaction determine vertical forest structure in young planted forests measured by terrestrial laser scanning

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Forest Ecosystems 2024年第3期11卷 266-275页

作者： Mengxi Wang Lander Baeten Frieke Van Coillie kim calders Kris Verheyen Quentin Ponette Haben Blondeel Bart Muys John Armston Hans Verbeeck Q-ForestLab Department of EnvironmentFaculty of Bioscience EngineeringGhent UniversityBelgium Forest&Nature Lab Department of EnvironmentFaculty of Bioscience EngineeringGhent UniversityBelgium Earth and Life Institute Université Catholique de Louvain(UCLouvain)Louvain-la-NeuveBelgium Department of Earth&Environmental Sciences KU LeuvenBelgium Department of Geographical Sciences University of MarylandCollege ParkMDUSA

Vertical forest structure is closely linked to multiple ecosystem characteristics,such as biodiversity,habitat,and *** tree species in planted forests has the potential to create diverse vertical forest structures due to the different physiological and morphological traits of the composing tree ***,the relative importance of species richness,species identity and species interactions for the variation in vertical forest structure remains unclear,mainly because traditional forest inventories do not observe vertical stand structure in *** laser scanning(TLS),however,allows to study vertical forest structure in an unprecedented ***,we used TLS single scan data from 126 plots across three experimental planted forests of a largescale tree diversity experiment in Belgium to study the drivers of vertical forest *** plots were 9–11years old young pure and mixed forests,characterized by four levels of tree species richness ranging from monocultures to four-species mixtures,across twenty composition *** generated vertical plant profiles from the TLS data and derived six stand structural *** mixed models were used to test the effect of species richness on structural *** a hierarchical diversity interaction modelling framework,we further assessed species identity effect and various species interaction effects on the six stand structural *** results showed that species richness did not significantly influence most of the stand structure variables,except for canopy height and foliage height *** identity on the other hand exhibited a significant impact on vertical forest structure across all *** interaction effects were observed to be site-dependent due to varying site conditions and species pools,and rapidly growing tree species tend to dominate these ***,our results highlighted the importance of considering both species identity an

关键词： TreeDivNet FORBIO Stand structural complexity Terrestrial laser scanning Vertical forest structure Tree diversity Planted forests

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Tropical forest canopies and their relationships with climate and disturbance： results from a global dataset of consistent field-based measurements

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Forest Ecosystems 2018年第1期5卷 77-90页

作者： marion pfeifer alemu gonsamo william woodgate luis cayuela andrew r.marshall alicia ledo timothy c.e.paine rob marchant andrew burt kim calders colin courtney-mustaphi aida cuni-sanchez nicolas j.deere dereje denu jose gonzalez de tanago robin hayward alvaro lau manuel j.macía pieter i.olivier petri pellikka hamidu seki deo shirima rebecca trevithick beatrice wedeux charlotte wheeler pantaleo k.t.munishi thomas martin abdul mustari philip j.platts school of natural and environmental sciences newcastle universityUpon TyneNewcastle NE1 7RUUK department of geography and planning university of torontoONCanada land and water commonwealth scientific and industrial research organisationYarralumlaACTAustralia school of mathematical and geospatial sciences rmit universityGPO Box 2476VMelbourneVIC 3001Australia department of biology geologyphysics and inorganic chemistryuniversidad rey juan carlosE-28933 MostolesMadridSpain tropical forest and peopleresearch centre university of the sunshine coastsippy DownsAustralia environment department university of yorkYorkUK flamingo land ltd. MaltonUK the institute of biological and environmental sciences environmental modelling groupuniversity of aberdeenAberdeenUK biological and environmental sciences university of stirlingStirling FK9 4L AUK york institute for tropical ecosystems environment departmentuniversity of yorkYork YO10 5NGUK department of geography university college londonGower StreetLondon WC1E 6BTUK earth observation climate and optical groupnational physical laboratoryHampton RoadTeddingtonMiddlesex TW11 0LWUK department of archaeology and ancient history uppsala universitetP.O.Box 256-751 05 UppsalaSESweden center for macroecology evolution and climateuniversity of copenhagenUniversitetsparken 152100 CopenhagenDKDenmark durrell institute of conservation and ecology(dice) school of anthropology and conservationuniversity of kentCanterbury CT2 7NRUK department of biology college of natural sciencesjimma universityJimmaEthiopia wageningen university&research laboratory of geo-information science and remote sensingDroevendaalsesteeg 36708 PB Wageningenthe Netherlands center for international forestry research(cifor) Situ GedeSindang BarangBogor 16680Indonesia departamento de biología área de botánicauniversidad autónoma de madridcalle Darwin 2-28049 MadridESSpain conservation ecology research unit university of pretoriaHatfieldPretoriaSouth Af

Background： Canopy structure, defined by leaf area index （LAI）, fractional vegetation cover （FCover） and fraction of absorbed photosynthetically active radiation （fAPAR）, regulates a wide range of forest functions and ecosystem services. Spatially consistent field-measurements of canopy structure are however lacking, particularly for the tropics. Methods： Here, we introduce the Global LAI database： a global dataset of field-based canopy structure measurements spanning tropical forests in four continents （Africa, Asia, Australia and the Americas）. We use these measurements to test for climate dependencies within and across continents, and to test for the potential of anthropogenic disturbance and forest protection to modulate those dependences. Results： Using data collected from 887 tropical forest plots, we show that maximum water deficit, defined across the most arid months of the year, is an important predictor of canopy structure, with all three canopy attributes declining significantly with increasing water deficit. Canopy attributes also increase with minimum temperature, and with the protection of forests according to both active （within protected areas） and passive measures （through topography）. Once protection and continent effects are accounted for, other anthropogenic measures （e.g. human population） do not improve the model. Conclusions： We conclude that canopy structure in the tropics is primarily a consequence of forest adaptation to the maximum water deficits historically experienced within a given region. Climate change, and in particular changes in drought regimes may thus affect forest structure and function, but forest protection may offer some resilience against this effect.

关键词： Leaf area index Fractional vegetation cover Fraction of absorbed photosynthetically active radiation,Human population pressure Protected areas Drought Climate change

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