Thumbnail Image

Revisiting leaf microstructural and physical properties for high-efficiency depositional niches of particulate matters

XV World Forestry Congress, 2-6 May 2022










Also available in:
No results found.

Related items

Showing items related by metadata.

  • Thumbnail Image
    Document
    The interaction between particulate matter (PM) adsorption and leaf gas exchange characteristics of urban trees exposed to fly ash
    XV World Forestry Congress, 2-6 May 2022
    2022
    Also available in:
    No results found.

    Because of their vast surface distribution, external particle reactivity, and leaf characteristics, urban trees can contribute as biofilters, reducing PM pollution. Leaves of trees permit PM to be accumulated, depending on their leaf traits. The impacts of several leaf characteristics on PM accumulation capabilities, such as surface roughness and leaf morphology, have been studied. The change in relative humidity (RH) caused by leaf gas exchanges of urban trees also can be highly related to the removal efficiency of PM because the hygroscopic growth of particle is closely related to PM deposition. Nevertheless, the impacts of leaf gas exchange parameters including stomatal conductance and transpiration rate on PM deposition ability still remain unidentified. The effects of PM pollution on urban plants’ photosynthesis are also not well understood. In this study, we analyzed the correlation between PM accumulation and photosynthesis (Pn), stomatal conductance (gs) and transpiration (Tr) of all the tested urban trees under approximately 300 μg/m3 of fly ash emitted condition and evaluated the increased effect of leaf gas exchange parameters on PM deposition. We also studied whether the inhibiting impacts on the ability of leaf gas exchange is occurred by the blockage and closure of the stomata by using scanning electron microscopy (SEM). The purpose of our research was to better understand the interaction between particulate matter (PM) adsorption and leaf gas exchange characteristics of urban trees. Furthermore, the findings of this study can be used to provide scientific data about the suitability of tree species for urban forests. Keywords: Research, Climate change, Sustainable forest management ID: 3623026
  • Thumbnail Image
    Article
    Taxonomic value of leaf epidermal markers in discriminating medicinal tree species of Apocynaceae Juss in Nigeria 2022
    Also available in:
    No results found.

    Apocynaceae is a useful family comprising of trees notable for different medicinal remedies. Consequent to their importance vis-à-vis scarcity in the forest, they are being sold in various Nigerian markets by herb sellers mostly in sterile and fragmentary forms. Hence, the medicinal plants are subjected to adulteration and substitution. Identification of the plants by users is done via floristic markers, which are not readily available for such purpose. It becomes pertinent to carry out the taxonomic revision of these trees to provide additional markers that will contribute to their effective identification for correct use. Various documentations have been made on members of apocynaceae and are properly placed on their respective taxa using epidermal traits. However, such information is scarce for Alstonia boonei, Holarrhena floribunda, Rauvolfia vomitoria, Thevetia nerifolia and Vocanga africana. This study therefore aimed at providing epidermal taxonomic markers that could be employed in delimiting the species as an alternative when the fruit or floral parts are wanting. Leaf epidermises of five species of apocynaceae representing 5 genera were studied under a biological microscope with a camera attachment. Data obtained were statistically analyzed. The epidermal cell was penta or hexagonal in A. boonei and V. africana. The stomatal length varied from 20.88 µm (R. vomitoria) to 25.92 µm (T. nerifolia) and 18.96 µm (R. vomitoria) to 29.28 µm (V. africana) on the abaxial and adaxial layers respectively. All the epidermal characters on the adaxial layer were significantly different (p<0.05) among the species. Anticlinal walls were sinuated in H. floribunda and T. nerifolia while in R. vomitoria, it was straight to wavy. V. africana and A. boonei anticlinal walls were straight. This study represents the first account of epidermal characterization of the members of apocynaceae in Nigeria and is of taxonomic importance in setting boundaries among the species. Keywords: Human health and well-being, Biodiversity conservation, Genetic resources ID: 3486776
  • Thumbnail Image
    Document
    Efficiency of total volatile organic compound of climbing plants Ardisia pusilla and Ficus pumila
    XV World Forestry Congress, 2-6 May 2022
    2022
    Also available in:
    No results found.

    This study was conducted to analyze removal efficiency of total volatile organic and physiological responses of climbing native plants Ardisia pusilla and Ficus pumila. The Hedera helix as a control, plants were investigated the total volatile organic compounds and their corresponding physiological responses with the maximum quantum yield of PSII (Fv/Fm)chlorophyll fluorescence, the vegetation index (the normalized difference vegetation index, NDVI; the simple ratio, SR; the carotenoid reflectance index 1, 2; CRI 1, 2) and physiological activity (the flavonoids and the phenolics). As a result, the removal amount of native plants tended to be lager than Hedera helix (2.973mgm-3h-1m-2 leaf area) and Ficus pumila (4.481mgm-3h-1m-2 leaf area) had more removal than Ardisia pusilla (3.786 mgm-3h-1m-2 leaf area), significantly. The NDVI, SR, and CRI 1, 2 of Ficus pumila and Hedera helix decreased after 2 hours, but there was no difference before and after with pollutants in Ardisia pusilla. In addition, only Ardisia pusilla had the normal range of 0.78 to 0.84 with Fv/Fm. Through this result, it is judged Ardisia pusilla is normally metabolized in plants without negative effects when removing indoor pollutants. Additionally, Ardisia pusilla did not change about phenolic, but the flavonoids contents increased after 2 hours. The physiological activity of Ficus pumila increased from 4 hours and then dereased again at 6 hours. Therefore, the removal of total volatile organic compounds was effective in the Ficus pumila, Ardisia pusilla, Hedera helix order, but in the results of stress and physiological activity of plants after air purification, Ardisia pusilla maintained a normal range than other plants and increased antioxidants. It is considered to be highly useful as an air purification plant due to its low damage. Keywords: Human health and well-being, Climate change, Covid-19, Research, Landscape management ID: 3622900

Users also downloaded

Showing related downloaded files

No results found.