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  1. Buch ; Dissertation / Habilitation: Carbon dioxide exchange and isotopic signature (3 C) of an unmanaged 250 year-old deciduous forest

    Knohl, Alexander

    (Berichte des Forschungszentrums Waldökosysteme : Reihe A ; 188)

    2004  

    Titelvarianten Carbon dioxide exchange and isotopic signature (3 C) of an unmanaged 250-year-old deciduous forest
    Verfasserangabe von Alexander Knohl. [Forsachungszentrum Waldökosysteme der Universität Göttingen. Hrsg.: F. Beese]
    Serientitel Berichte des Forschungszentrums Waldökosysteme : Reihe A ; 188
    Berichte des Forschungszentrums Waldökosysteme
    Berichte des Forschungszentrums Waldökosysteme ; Reihe A
    Überordnung Berichte des Forschungszentrums Waldökosysteme
    Berichte des Forschungszentrums Waldökosysteme ; Reihe A
    Sprache Englisch
    Umfang 97, VI S. : Ill., graph. Darst., 21 cm
    Verlag FZW
    Erscheinungsort Göttingen
    Erscheinungsland Deutschland
    Dokumenttyp Buch ; Dissertation / Habilitation
    Dissertation / Habilitation Jena, Univ., Diss., 2003
    Anmerkung Zsfassung in dt. Sprache
    HBZ-ID HT014057075
    Datenquelle Katalog ZB MED Ernährung, Umwelt, Agrar

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    Verfügbar in ZB MED Bonn

    SignaturLeihstatusStandort
    048/487 ausleihbar (Lesesaal) Freihandmagazin (U1)

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  2. Buch ; Dissertation / Habilitation: Carbon dioxide exchange and isotopic signature (13 C) of an unmanaged 250 year-old deciduous forest

    Knohl, Alexander

    2003  

    Verfasserangabe vorgelegt von Alexander Knohl
    Sprache Englisch ; Deutsch
    Umfang 97, X S. : Ill., graph. Darst.
    Erscheinungsland Deutschland
    Dokumenttyp Buch ; Dissertation / Habilitation
    Dissertation / Habilitation Jena, Univ., Diss., 2003
    Anmerkung Zsfassung in dt. Sprache
    HBZ-ID HT014317208
    Datenquelle Katalog ZB MED Medizin, Gesundheit

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    SignaturLeihstatusStandort
    2005 E 194 bestellbar zur Ausleihe Magazin

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  3. Artikel ; Online: Decoding autumn phenology: Unraveling the link between observation methods and detected environmental cues.

    Kloos, Simon / Klosterhalfen, Anne / Knohl, Alexander / Menzel, Annette

    Global change biology

    2024  Band 30, Heft 3, Seite(n) e17231

    Abstract: Leaf coloring and fall mark the end of the growing season (EOS), playing essential roles in nutrient cycling, resource allocation, ecological interactions, and as climate change indicators. However, understanding future changes in autumn phenology is ... ...

    Abstract Leaf coloring and fall mark the end of the growing season (EOS), playing essential roles in nutrient cycling, resource allocation, ecological interactions, and as climate change indicators. However, understanding future changes in autumn phenology is challenging due to the multitude of likely environmental cues and substantial variations in timing caused by different derivation methods. Yet, it remains unclear whether these two factors are independent or if methodological uncertainties influence the environmental cues determined. We derived start of growing season (SOS) and EOS at a mixed beech forest in Central Germany for the period 2000-2020 based on four different derivation methods using a unique long-term data set of in-situ data, canopy imagery, eddy covariance measurements, and satellite remote sensing data and determined their influence on a predictor analysis of leaf senescence. Both SOS and EOS exhibited substantial ranges in mean onset dates (39.5 and 28.6 days, respectively) across the different methods, although inter-annual variations and advancing SOS trends were similar across methods. Depending on the data, EOS trends were advanced or delayed, but inter-annual patterns correlated well (mean r = .46). Overall, warm, dry, and less photosynthetically productive growing seasons were more likely to be associated with a delayed EOS, while colder, wetter, and more photosynthetically productive vegetation periods resulted in an earlier EOS. In addition, contrary to recent results, no clear influence of pre-solstice vegetation activity on the timing of senescence was detected. However, most notable were the large differences in sign and strength of potential drivers both in the univariate and multivariate analyses when comparing derivation methodologies. The results suggest that an ensemble analysis of all available phenological data sources and derivation methods is needed for general statements on autumn phenology and its influencing variables and correct implementation of the senescence process in ecosystem models.
    Mesh-Begriff(e) Ecosystem ; Seasons ; Cues ; Temperature ; Forests ; Climate Change
    Sprache Englisch
    Erscheinungsdatum 2024-03-13
    Erscheinungsland England
    Dokumenttyp Journal Article
    ZDB-ID 1281439-8
    ISSN 1365-2486 ; 1354-1013
    ISSN (online) 1365-2486
    ISSN 1354-1013
    DOI 10.1111/gcb.17231
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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    Z 6338: Hefte anzeigen

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  4. Artikel ; Online: Simulated effects of canopy structural complexity on forest productivity

    Toda, Motomu / Knohl, Alexander / Luyssaert, Sebastiaan / Hara, Toshihiko

    Forest Ecology and Management. 2023 June, v. 538 p.120978-

    2023  

    Abstract: Late-successional unmanaged forests (or old-growth forests) are important terrestrial carbon sinks. Their structurally complex features have been hypothesized to strongly affect forest productivity. However, the mechanisms through which structural ... ...

    Abstract Late-successional unmanaged forests (or old-growth forests) are important terrestrial carbon sinks. Their structurally complex features have been hypothesized to strongly affect forest productivity. However, the mechanisms through which structural complexity influences forest productivity remain unresolved. Here, we report a set of idealised simulations in boreal, sub-boreal, cool-temperate, warm-temperate and tropical forests using a dynamic model of atmosphere and vegetation interactions (Multilayered Integrated Numerical Model of Surface Physics-Growing Plants Interaction, MINoSGI). We aimed to elucidate the effects of tree-size and canopy structural complexity on stand-scale gross primary productivity (GPP) of old-growth forests over 300-year time series. We assumed the tree-size structures of mature old-growth forests as the initial conditions of the simulations. We focused on three different developmental phases of the forests: 29-48 years (phase I), 77-96 years (phase II) and 277-296 years (phase III) from the start of the simulations. Phase I corresponds to an old-growth forest because of our settings of the initial conditions of the simulations, and phase III to a long-term resultant forest without recruitment or mortality. We show that, for a given biome-specific leaf area index (LAI) and individual foliage shape (η), the greatest difference in GPP (ΔGPP) between forests with the most and least structurally complex canopies was 263 g C/m⁻²(-|-) year⁻¹ in phase I and II when old-growth forests with the most complex canopy structures sustained their complexity, equivalent to almost 13 % of the annual GPP. By contrast, the maximum difference in ΔGPP was reduced to 153 g C/m⁻²(-|-) year⁻¹ in phase III, equivalent to 8 % of the annual GPP total because the complex canopy structures of old-growth forests without recruitment or mortality approached less multi-layered ones similar to those of less complex and managed forests. Our simulation results indicate that greater tree-size and canopy structural complexity is associated with a broader vertical distribution of foliage, supporting the localisation of leaves in multiple layers. This increases the efficacy of light usage, particularly for shaded leaves receiving only diffuse light within the canopy. As a consequence, for all forest biomes, an increase in in-canopy diffuse light increases GPP in forests with complex canopy structures due to an enhancement of light use efficiency (LUE) of shaded leaves. Overall, our results quantify one of the mechanisms underlying the effects of canopy structural complexity on forest productivity. Moreover, differences in foliage shape between forest biomes can add to uncertainties when predicting GPP based on simulation models. We, therefore, suggest that precise values of the biome-specific factors associated with canopy structure should be employed into simulation models of global carbon budgets.
    Schlagwörter administrative management ; canopy ; carbon ; dynamic models ; forest ecology ; gross primary productivity ; leaf area index ; leaves ; mathematical models ; mortality ; old-growth forests ; radiation use efficiency ; spatial distribution ; time series analysis ; Old-growth forest ; In-canopy microclimate ; Canopy photosynthesis ; Sunlit and shaded leaves ; Diffuse light ; Atmosphere-vegetation dynamics model (MINoSGI)
    Sprache Englisch
    Erscheinungsverlauf 2023-06
    Erscheinungsort Elsevier B.V.
    Dokumenttyp Artikel ; Online
    ZDB-ID 751138-3
    ISSN 0378-1127
    ISSN 0378-1127
    DOI 10.1016/j.foreco.2023.120978
    Datenquelle NAL Katalog (AGRICOLA)

    Volltext online

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    Z 6026: Hefte anzeigen

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  5. Buch ; Online: High-resolution true-color orthophotos with 10 cm resolution 2022

    Schlund, Michael / Erasmi, Stefan / Knohl, Alexander

    2023  

    Abstract: High-resolution true-color orthophotos with 10 cm resolution of the area, which was covered by the airborne campaign in 2022. Note that ecw files are raster files with a high compression, which can be ingested in e.g. QGIS. ...

    Abstract High-resolution true-color orthophotos with 10 cm resolution of the area, which was covered by the airborne campaign in 2022. Note that ecw files are raster files with a high compression, which can be ingested in e.g. QGIS.
    Schlagwörter database ; Dataset ; Image ; ddc:910
    Sprache Englisch
    Verlag GRO.data
    Erscheinungsland de
    Dokumenttyp Buch ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  6. Buch ; Online: Rasters for ALS metrics at 50m resolution 2022

    Schlund, Michael / Erasmi, Stefan / Knohl, Alexander

    2023  

    Abstract: Raster models for 39 LiDAR-derived metrics over the Bukit Duabelas (Area 1), Batanghari regency (Area 2) and Harapan rainforest protected area (Area 3), in Jambi, Sumatra, Indonesia. Pixel size: 50m. Geographic Coordinate System: EPSG 32748. Please do ... ...

    Abstract Raster models for 39 LiDAR-derived metrics over the Bukit Duabelas (Area 1), Batanghari regency (Area 2) and Harapan rainforest protected area (Area 3), in Jambi, Sumatra, Indonesia. Pixel size: 50m. Geographic Coordinate System: EPSG 32748. Please do not use the data for a quantitative change analysis between 2020 and 2022. If you want to do a quantitative change analysis, please contact the points of contact as additional processing steps may be required.
    Schlagwörter database ; Dataset ; Image ; ddc:910
    Sprache Englisch
    Verlag GRO.data
    Erscheinungsland de
    Dokumenttyp Buch ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  7. Buch ; Online: Rasters for ALS metrics at 1000m² resolution 2022

    Schlund, Michael / Erasmi, Stefan / Knohl, Alexander

    2023  

    Abstract: Raster models for 39 LiDAR-derived metrics over the Bukit Duabelas (Area 1), Batanghari regency (Area 2) and Harapan rainforest protected area (Area 3), in Jambi, Sumatra, Indonesia. Pixel size: 31.62m (i.e., approx. 1000m²). Geographic Coordinate System: ...

    Abstract Raster models for 39 LiDAR-derived metrics over the Bukit Duabelas (Area 1), Batanghari regency (Area 2) and Harapan rainforest protected area (Area 3), in Jambi, Sumatra, Indonesia. Pixel size: 31.62m (i.e., approx. 1000m²). Geographic Coordinate System: EPSG 32748. Please do not use the data for a quantitative change analysis between 2020 and 2022. If you want to do a quantitative change analysis, please contact the points of contact as additional processing steps may be required.
    Schlagwörter database ; Dataset ; Image ; ddc:910
    Sprache Englisch
    Verlag GRO.data
    Erscheinungsland de
    Dokumenttyp Buch ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  8. Buch ; Online: Rasters for ALS metrics at 10m resolution 2022

    Schlund, Michael / Erasmi, Stefan / Knohl, Alexander

    2023  

    Abstract: Raster models for 39 LiDAR-derived metrics over the Bukit Duabelas (Area 1), Batanghari regency (Area 2) and Harapan rainforest protected area (Area 3), in Jambi, Sumatra, Indonesia. Pixel size: 10m. Geographic Coordinate System: EPSG 32748. Please do ... ...

    Abstract Raster models for 39 LiDAR-derived metrics over the Bukit Duabelas (Area 1), Batanghari regency (Area 2) and Harapan rainforest protected area (Area 3), in Jambi, Sumatra, Indonesia. Pixel size: 10m. Geographic Coordinate System: EPSG 32748. Please do not use the data for a quantitative change analysis between 2020 and 2022. If you want to do a quantitative change analysis, please contact the points of contact as additional processing steps may be required.
    Schlagwörter database ; Dataset ; Image ; ddc:910
    Sprache Englisch
    Verlag GRO.data
    Erscheinungsland de
    Dokumenttyp Buch ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  9. Artikel ; Online: Drought alters aboveground biomass production efficiency: Insights from two European beech forests.

    Wei, Jingshu / von Arx, Georg / Fan, Zexin / Ibrom, Andreas / Mund, Martina / Knohl, Alexander / Peters, Richard L / Babst, Flurin

    The Science of the total environment

    2024  Band 919, Seite(n) 170726

    Abstract: The fraction of photosynthetically assimilated carbon that trees allocate to long-lasting woody biomass pools (biomass production efficiency - BPE), is a key metric of the forest carbon balance. Its apparent simplicity belies the complex interplay ... ...

    Abstract The fraction of photosynthetically assimilated carbon that trees allocate to long-lasting woody biomass pools (biomass production efficiency - BPE), is a key metric of the forest carbon balance. Its apparent simplicity belies the complex interplay between underlying processes of photosynthesis, respiration, litter and fruit production, and tree growth that respond differently to climate variability. Whereas the magnitude of BPE has been routinely quantified in ecological studies, its temporal dynamics and responses to extreme events such as drought remain less well understood. Here, we combine long-term records of aboveground carbon increment (ACI) obtained from tree rings with stand-level gross primary productivity (GPP) from eddy covariance (EC) records to empirically quantify aboveground BPE (= ACI/GPP) and its interannual variability in two European beech forests (Hainich, DE-Hai, Germany; Sorø, DK-Sor, Denmark). We found significant negative correlations between BPE and a daily-resolved drought index at both sites, indicating that woody growth is de-prioritized under water limitation. During identified extreme years, early-season drought reduced same-year BPE by 29 % (Hainich, 2011), 31 % (Sorø, 2006), and 14 % (Sorø, 2013). By contrast, the 2003 late-summer drought resulted in a 17 % reduction of post-drought year BPE at Hainich. Across the entire EC period, the daily-to-seasonal drought response of BPE resembled that of ACI, rather than that of GPP. This indicates that BPE follows sink dynamics more closely than source dynamics, which appear to be decoupled given the distinctive climate response patterns of GPP and ACI. Based on our observations, we caution against estimating the magnitude and variability of the carbon sink in European beech (and likely other temperate forests) based on carbon fluxes alone. We also encourage comparable studies at other long-term EC measurement sites from different ecosystems to further constrain the BPE response to rare climatic events.
    Mesh-Begriff(e) Ecosystem ; Biomass ; Fagus/physiology ; Droughts ; Forests ; Carbon ; Climate Change
    Chemische Substanzen Carbon (7440-44-0)
    Sprache Englisch
    Erscheinungsdatum 2024-02-06
    Erscheinungsland Netherlands
    Dokumenttyp Journal Article
    ZDB-ID 121506-1
    ISSN 1879-1026 ; 0048-9697
    ISSN (online) 1879-1026
    ISSN 0048-9697
    DOI 10.1016/j.scitotenv.2024.170726
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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    Zs.A 949: Hefte anzeigen Standort:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (1.OG)
    ab Jg. 2022: Lesesaal (EG)

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  10. Buch ; Online: High-resolution true-color orthophotos with 5 cm resolution

    Schlund, Michael / Erasmi, Stefan / Knohl, Alexander

    2022  

    Abstract: High-resolution true-color orthophotos with 5 cm resolution of the area, which was covered by the airborne campaign in 2020. Individual photos were mosaicked to an image covering the different areas. Note that ecw files are raster files with a high ... ...

    Abstract High-resolution true-color orthophotos with 5 cm resolution of the area, which was covered by the airborne campaign in 2020. Individual photos were mosaicked to an image covering the different areas. Note that ecw files are raster files with a high compression, which can be ingested in e.g. QGIS.
    Schlagwörter database ; Dataset ; Text ; ddc:910
    Sprache Englisch
    Verlag GRO.data
    Erscheinungsland de
    Dokumenttyp Buch ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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