KOBV Portal

Hits per page

hits 1 - 10 | 15 hits

Sorting

Online Resource

Influence of Two Cutting Propagation Systems on Early Field Growth of Four Eucalyptus urophylla × Eucalyptus grandis Clones in the Republic of Congo

Mankessi, Francois ; Saya, Rachel Aubin ; Toto, Mélanie ; [et al.]

Scientific Research Publishing, Inc. ; 2022

In: OALib Vol. 09, No. 12 ( 2022), p. 1-12

add to watchlist on the watchlist

Details

In: OALib, Scientific Research Publishing, Inc., Vol. 09, No. 12 ( 2022), p. 1-12

Type of Medium: Online Resource

ISSN: 2333-9721 , 2333-9705

URL: Article

DOI: 10.4236/oalib.1109422

Language: Unknown

Publisher: Scientific Research Publishing, Inc.

Publication Date: 2022

detail.hit.zdb_id: 2777820-4

Bookmarklink

Library	Location	Call Number	Volume/Issue/Year	Availability

Others were also interested in ...

Online Resource

Open Access Request

Availability (electronic / print)

BTU Cottbus

Wissenschaftspark Albert Einstein

EUV Frankfurt

TH Wildau

FH Potsdam

Online Resource

Biomasse et stocks de carbone des forêts tropicales africaines (synthèse bibliographique)

Panzou, Grace Jopaul Loubota ; Doucet, Jean-Louis ; Loumeto, Jean-Joël ; [et al.]

University of Liege ; 2016

In: BASE

add to watchlist on the watchlist

Details

In: BASE, University of Liege

Abstract: Biomass and carbon stocks of tropical African forests. A review Introduction. Quantifying the biomass and carbon stocks contained in tropical forests has become an international priority for the implementation of the REDD+ mechanism. Forest biomass is estimated at three successive levels: the tree, the stand and the region level. This paper reviews the state of the art regarding the estimation of biomass and carbon stocks in tropical African forests. Literature. This review highlights the fact that very few allometric equations, equations used for estimating the biomass of the tree using non-destructive measurements (diameter, height), have been established for tropical African forests. At the stand level, the review highlights the spatial and temporal variations in biomass between forest types in Central and Eastern Africa. While biomass recovery after a disturbance (logging, for instance) is rather quick, a great deal of uncertainty still remains regarding the spatial variation in biomass, and there is no consensus on a regional biomass map. The quality of biomass mapping in tropical Africa strongly depends on the type of remotely-sensed data being used (optical, RADAR or LIDAR), and the allometric equation used to convert forest inventory data into biomass. Conclusions. Based on the lack of precision of the available allometric equations and forest inventory data and the large spatial scale involved, many uncertainties persist in relation to the estimation of the biomass and carbon stocks contained in African tropical forests.

Type of Medium: Online Resource

ISSN: 1780-4507 , 1370-6233

URL: Journal

URL: Article

DOI: 10.25518/1780-4507

DOI: 10.25518/1780-4507.13232

Language: French

Publisher: University of Liege

Publication Date: 2016

detail.hit.zdb_id: 2045320-6

Bookmarklink

Library	Location	Call Number	Volume/Issue/Year	Availability

Others were also interested in ...

Online Resource

Open Access Request

Availability (electronic / print)

BTU Cottbus

Wissenschaftspark Albert Einstein

EUV Frankfurt

TH Wildau

FH Potsdam

Online Resource

Allometric equation for Raphia laurentii De Wild, the commonest palm in the central Congo peatlands

Bocko, Yannick Enock ; Panzou, Grace Jopaul Loubota ; Dargie, Greta Christina ; [et al.]

Public Library of Science (PLoS) ; 2023

In: PLOS ONE Vol. 18, No. 4 ( 2023-4-14), p. e0273591-

add to watchlist on the watchlist

Details

In: PLOS ONE, Public Library of Science (PLoS), Vol. 18, No. 4 ( 2023-4-14), p. e0273591-

Abstract: The world’s largest tropical peatland lies in the central Congo Basin. Raphia laurentii De Wild, the most abundant palm in these peatlands, forms dominant to mono-dominant stands across approximately 45% of the peatland area. R . laurentii is a trunkless palm with fronds up to 20 m long. Owing to its morphology, there is currently no allometric equation which can be applied to R . laurentii . Therefore it is currently excluded from aboveground biomass (AGB) estimates for the Congo Basin peatlands. Here we develop allometric equations for R . laurentii , by destructively sampling 90 individuals in a peat swamp forest, in the Republic of the Congo. Prior to destructive sampling, stem base diameter, petiole mean diameter, the sum of petiole diameters, total palm height, and number of palm fronds were measured. After destructive sampling, each individual was separated into stem, sheath, petiole, rachis, and leaflet categories, then dried and weighed. We found that palm fronds represented at least 77% of the total AGB in R . laurentii and that the sum of petiole diameters was the best single predictor variable of AGB. The best overall allometric equation, however, combined the sum of petiole diameters ( SD p ), total palm height ( H ), and tissue density ( TD ): AGB = Exp (−2.691 + 1.425 × ln( SD p ) + 0.695 × ln( H ) + 0.395 × ln( TD )). We applied one of our allometric equations to data from two nearby 1-hectare forest plots, one dominated by R . laurentii , where R . laurentii accounted for 41% of the total forest AGB (with hardwood tree AGB estimated using the Chave et al. 2014 allometric equation), and one dominated by hardwood species, where R . laurentii accounted for 8% of total AGB. Across the entire region we estimate that R . laurentii stores around 2 million tonnes of carbon aboveground. The inclusion of R . laurentii in AGB estimates, will drastically improve overall AGB, and therefore carbon stock estimates for the Congo Basin peatlands.

Type of Medium: Online Resource

ISSN: 1932-6203

URL: Article

DOI: 10.1371/journal.pone.0273591

DOI: 10.1371/journal.pone.0273591.g001

DOI: 10.1371/journal.pone.0273591.g002

DOI: 10.1371/journal.pone.0273591.g003

DOI: 10.1371/journal.pone.0273591.g004

DOI: 10.1371/journal.pone.0273591.g005

DOI: 10.1371/journal.pone.0273591.g006

DOI: 10.1371/journal.pone.0273591.t001

DOI: 10.1371/journal.pone.0273591.t002

DOI: 10.1371/journal.pone.0273591.s001

DOI: 10.1371/journal.pone.0273591.s002

DOI: 10.1371/journal.pone.0273591.s003

DOI: 10.1371/journal.pone.0273591.s004

DOI: 10.1371/journal.pone.0273591.s005

DOI: 10.1371/journal.pone.0273591.r001

DOI: 10.1371/journal.pone.0273591.r002

DOI: 10.1371/journal.pone.0273591.r003

DOI: 10.1371/journal.pone.0273591.r004

Language: English

Publisher: Public Library of Science (PLoS)

Publication Date: 2023

detail.hit.zdb_id: 2267670-3

Bookmarklink

Library	Location	Call Number	Volume/Issue/Year	Availability

Others were also interested in ...

Online Resource

Open Access Request

Availability (electronic / print)

BTU Cottbus

Wissenschaftspark Albert Einstein

EUV Frankfurt

TH Wildau

FH Potsdam

Online Resource

Height–diameter allometry in African monodominant forest close to mixed forest

Loubota Panzou, Grace Jopaul ; Bocko, Yannick Enock ; Mavoungou, Alain Yves ; [et al.]

Cambridge University Press (CUP) ; 2021

In: Journal of Tropical Ecology Vol. 37, No. 2 ( 2021-03), p. 98-107

add to watchlist on the watchlist

Details

In: Journal of Tropical Ecology, Cambridge University Press (CUP), Vol. 37, No. 2 ( 2021-03), p. 98-107

Abstract: African monodominant forests are frequently formed by Gilbertiodendron dewevrei (De Wild.) J. Leonard and commonly found close to mixed forests. However, previous studies have ignored differences between these two forest types in height–diameter allometry, which is extremely important for aboveground biomass (AGB) estimates. This study aims to evaluate the performance of height–diameter models and their effects on height attributes and AGB estimations in African monodominant and mixed forests. Four 1-ha plots divided in 16 subplots (0.25 ha) were installed in each forest type in northern Republic of Congo. We measured diameter of all trees ≥ 10 cm diameter for each subplot and we measured the height of 264 trees over a large range of 7–64 m in two forest types. There was a significant difference in height–diameter allometry between two forest types and trees were taller and had greater AGB in monodominant forests than in mixed forests. Two height–diameter models from the literature generated the lowest error values when predicting tree height and AGB in mixed forests, whereas no model derived from the literature was appropriate for monodominant forests. The variation in height–diameter allometry between monodominant and mixed forests influences AGB estimates that have practical implications for carbon monitoring.

Type of Medium: Online Resource

ISSN: 0266-4674 , 1469-7831

URL: Article

DOI: 10.1017/S0266467421000183

RVK:

WA 15000

Language: English

Publisher: Cambridge University Press (CUP)

Publication Date: 2021

detail.hit.zdb_id: 1466679-0

SSG: 12

SSG: 23

Bookmarklink

Library	Location	Call Number	Volume/Issue/Year	Availability

Others were also interested in ...

Online Resource

Open Access Request

Availability (electronic / print)

BTU Cottbus

Wissenschaftspark Albert Einstein

EUV Frankfurt

TH Wildau

Online Resource

Architectural differences associated with functional traits among 45 coexisting tree species in Central Africa

Loubota Panzou, Grace Jopaul ; Ligot, Gauthier ; Gourlet‐Fleury, Sylvie ; [et al.]

Wiley ; 2018

In: Functional Ecology Vol. 32, No. 11 ( 2018-11), p. 2583-2593

add to watchlist on the watchlist

Details

In: Functional Ecology, Wiley, Vol. 32, No. 11 ( 2018-11), p. 2583-2593

Abstract: Les traits architecturaux, qui déterminent la capture de la lumière dans un environnement donné, sont un aspect important des stratégies d’histoire de vie des espèces d’arbres tropicaux. Dans cette étude, nous avons examiné comment la variation interspécifique des traits architecturaux était liée aux traits fonctionnels de 45 espèces d’arbres coexistentes en Afrique centrale. A l’échelle de l’arbre, nous avons mesuré le diamètre, la hauteur totale et les dimensions du houppier pour une moyenne de 30 arbres (de 14 à 72 arbres, un total de 968) sur une large gamme de diamètres (jusqu’à 162 cm). En utilisant un modèle log‐log, nous avons analysé les relations allométriques entre la hauteur totale ou les dimensions du houppier et le diamètre des arbres. A l’échelle de l’espèce, nous avons prédit les traits architecturaux (hauteur et dimensions du houppier) à partir des allométries spécifiques, à 15 cm de diamètre et au diamètre maximum, et nous avons analysé leur relation avec les traits fonctionnels en particulier l’exigence en lumière, la densité du bois, la phénologie et le mode de dispersion. Parmi les 45 espèces coexistentes, nous avons identifié une forte variation des allométries de la hauteur et des dimensions du houppier, ainsi que des traits architecturaux dérivés de ces allométries. Nous avons montré une corrélation positive entre les traits architecturaux, suggérant que les espèces de grande taille présentes dans la canopée sont plus hautes et ont des houppiers plus larges et plus profonds que les espèces de petite taille présentes dans le sous‐bois à tous les stades ontogéniques. Les relations entre les traits architecturaux et fonctionnels mettent en évidence un continuum d’espèces entre les espèces de grande taille de canopée et les espèces de petite taille du sous‐bois. Les premières ont tendance à être exigeantes en lumière, dispersées par le vent, décidues et contribuent largement à la biomasse forestière, alors que les secondes ont tendance à être tolérantes à l’ombrage, dispersées par les animaux, sempervirentes et plus abondantes en densité de tiges. Nos résultats mettent en évidence de fortes différences architecturales entre les espèces d’arbres coexistentes en Afrique centrale. Les relations entre les traits architecturaux et fonctionnels fournissent un aperçu des stratégies d’histoire de vie des espèces d’arbres tropicaux.

Type of Medium: Online Resource

ISSN: 0269-8463 , 1365-2435

URL: Issue

URL: Article

DOI: 10.1111/fec.2018.32.issue-11

DOI: 10.1111/1365-2435.13198

Language: English

Publisher: Wiley

Publication Date: 2018

detail.hit.zdb_id: 2020307-X

detail.hit.zdb_id: 619313-4

SSG: 12

Bookmarklink

Library	Location	Call Number	Volume/Issue/Year	Availability

Others were also interested in ...

Online Resource

Open Access Request

Availability (electronic / print)

BTU Cottbus

Wissenschaftspark Albert Einstein

EUV Frankfurt

TH Wildau

FH Potsdam

Online Resource

Intensity, determinants, and impacts of liana load on tropical trees in central Africa

Loubota Panzou, Grace Jopaul ; Loumeto, Jean‐Joel ; Chantrain, Arthur ; [et al.]

Wiley ; 2022

In: Ecosphere Vol. 13, No. 12 ( 2022-12)

add to watchlist on the watchlist

Details

In: Ecosphere, Wiley, Vol. 13, No. 12 ( 2022-12)

Abstract: Lianas can create dense foliage that reduces the light available for the host trees on which they grow and can directly damage the host trees during their development. A better estimation of liana load and understanding of the determinants and impacts of liana load in tropical forests are both important in community ecology and ecosystem science. This has, however, never been studied to date in central Africa. Here, we evaluated the intensity, determinants, and impacts of liana load in three forest sites in central Africa. We determined the liana load categories for all trees belonging to 78 of the most dominant tree species (2683 trees in total), with tree diameters ranging from 10 to 250 cm. The liana load was visually estimated as the liana cover on host tree using simple scale indices, and the proportion of trees covered by lianas defined as the liana prevalence was estimated for each species. Overall, 42% of the 2683 trees were liana‐loaded and the number of liana‐loaded trees was higher for smaller diameter classes in the three forest sites. Within each forest site, there was a significant difference in liana prevalence among coexisting species. Taller trees with shallow crowns were less covered by liana at the tree level, whereas trees belonging to light‐demanding and wind‐dispersed species showed a lower liana prevalence rate at the species level. In each forest site, the liana load significantly affected tree height–diameter allometry, with liana‐loaded trees being shorter for the same diameter. Lianas promote the structural complexity and influence tree diversity and ecosystem functioning of tropical forests.

Type of Medium: Online Resource

ISSN: 2150-8925 , 2150-8925

URL: Issue

URL: Article

DOI: 10.1002/ecs2.v13.12

DOI: 10.1002/ecs2.4322

Language: English

Publisher: Wiley

Publication Date: 2022

detail.hit.zdb_id: 2572257-8

Bookmarklink

Library	Location	Call Number	Volume/Issue/Year	Availability

Others were also interested in ...

Online Resource

Open Access Request

Availability (electronic / print)

BTU Cottbus

Wissenschaftspark Albert Einstein

EUV Frankfurt

TH Wildau

FH Potsdam

Online Resource

Tropical tree allometry and crown allocation, and their relationship with species traits in central Africa

Mankou, Géraud Sidoine ; Ligot, Gauthier ; Loubota Panzou, Grace Jopaul ; [et al.]

Elsevier BV ; 2021

In: Forest Ecology and Management Vol. 493 ( 2021-08), p. 119262-

add to watchlist on the watchlist

Details

In: Forest Ecology and Management, Elsevier BV, Vol. 493 ( 2021-08), p. 119262-

Type of Medium: Online Resource

ISSN: 0378-1127

URL: Article

DOI: 10.1016/j.foreco.2021.119262

Language: English

Publisher: Elsevier BV

Publication Date: 2021

detail.hit.zdb_id: 2016648-5

detail.hit.zdb_id: 751138-3

SSG: 23

SSG: 12

Bookmarklink

Library	Location	Call Number	Volume/Issue/Year	Availability

Others were also interested in ...

Online Resource

Open Access Request

Availability (electronic / print)

BTU Cottbus

Online Resource

Height-diameter allometric equations of an emergent tree species from the Congo Basin

Kafuti, Chadrack ; Van den Bulcke, Jan ; Beeckman, Hans ; [et al.]

Elsevier BV ; 2022

In: Forest Ecology and Management Vol. 504 ( 2022-01), p. 119822-

add to watchlist on the watchlist

Details

In: Forest Ecology and Management, Elsevier BV, Vol. 504 ( 2022-01), p. 119822-

Type of Medium: Online Resource

ISSN: 0378-1127

URL: Article

DOI: 10.1016/j.foreco.2021.119822

Language: English

Publisher: Elsevier BV

Publication Date: 2022

detail.hit.zdb_id: 2016648-5

detail.hit.zdb_id: 751138-3

SSG: 23

SSG: 12

Bookmarklink

Library	Location	Call Number	Volume/Issue/Year	Availability

Others were also interested in ...

Online Resource

Open Access Request

Availability (electronic / print)

BTU Cottbus

Online Resource

What controls local-scale aboveground biomass variation in central Africa? Testing structural, composition and architectural attributes

Loubota Panzou, Grace Jopaul ; Fayolle, Adeline ; Feldpausch, Ted R. ; [et al.]

Elsevier BV ; 2018

In: Forest Ecology and Management Vol. 429 ( 2018-12), p. 570-578

add to watchlist on the watchlist

Details

In: Forest Ecology and Management, Elsevier BV, Vol. 429 ( 2018-12), p. 570-578

Type of Medium: Online Resource

ISSN: 0378-1127

URL: Article

DOI: 10.1016/j.foreco.2018.07.056

Language: English

Publisher: Elsevier BV

Publication Date: 2018

detail.hit.zdb_id: 2016648-5

detail.hit.zdb_id: 751138-3

SSG: 23

SSG: 12

Bookmarklink

Library	Location	Call Number	Volume/Issue/Year	Availability

Others were also interested in ...

Online Resource

Open Access Request

Availability (electronic / print)

BTU Cottbus

Online Resource

Pantropical variability in tree crown allometry

Loubota Panzou, Grace Jopaul ; Fayolle, Adeline ; Jucker, Tommaso ; [et al.]

Wiley ; 2021

In: Global Ecology and Biogeography Vol. 30, No. 2 ( 2021-02), p. 459-475

add to watchlist on the watchlist

Details

In: Global Ecology and Biogeography, Wiley, Vol. 30, No. 2 ( 2021-02), p. 459-475

Abstract: Tree crowns determine light interception, carbon and water exchange. Thus, understanding the factors causing tree crown allometry to vary at the tree and stand level matters greatly for the development of future vegetation modelling and for the calibration of remote sensing products. Nevertheless, we know little about large‐scale variation and determinants in tropical tree crown allometry. In this study, we explored the continental variation in scaling exponents of site‐specific crown allometry and assessed their relationships with environmental and stand‐level variables in the tropics. Location Global tropics. Time period Early 21st century. Major taxa studied Woody plants. Methods Using a dataset of 87,737 trees distributed among 245 forest and savanna sites across the tropics, we fitted site‐specific allometric relationships between crown dimensions (crown depth, diameter and volume) and stem diameter using power‐law models. Stand‐level and environmental drivers of crown allometric relationships were assessed at pantropical and continental scales. Results The scaling exponents of allometric relationships between stem diameter and crown dimensions were higher in savannas than in forests. We identified that continental crown models were better than pantropical crown models and that continental differences in crown allometric relationships were driven by both stand‐level (wood density) and environmental (precipitation, cation exchange capacity and soil texture) variables for both tropical biomes. For a given diameter, forest trees from Asia and savanna trees from Australia had smaller crown dimensions than trees in Africa and America, with crown volumes for some Asian forest trees being smaller than those of trees in African forests. Main conclusions Our results provide new insight into geographical variability, with large continental differences in tropical tree crown allometry that were driven by stand‐level and environmental variables. They have implications for the assessment of ecosystem function and for the monitoring of woody biomass by remote sensing techniques in the global tropics.

Type of Medium: Online Resource

ISSN: 1466-822X , 1466-8238

URL: Issue

URL: Article

DOI: 10.1111/geb.v30.2

DOI: 10.1111/geb.13231

Language: English

Publisher: Wiley

Publication Date: 2021

detail.hit.zdb_id: 1479787-2

detail.hit.zdb_id: 2021283-5

SSG: 12

Bookmarklink

Library	Location	Call Number	Volume/Issue/Year	Availability

Others were also interested in ...

Online Resource

Open Access Request

Availability (electronic / print)

BTU Cottbus

Wissenschaftspark Albert Einstein

EUV Frankfurt

TH Wildau

FH Potsdam

hits 1 - 10 | 15 hits

Nothing or not found what you are looking for? Please check your search query or use the Interlibrary Loan Search.

Kooperativer Bibliotheksverbund

Berlin Brandenburg