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Sustainability in Environment
Number of Followers: 4  

  This is an Open Access Journal Open Access journal
ISSN (Print) 2470-637X - ISSN (Online) 2470-6388
Published by Scholink Homepage  [7 journals]
  • Multiscale Landforms Classification Based on UAV Datasets

    • Authors: Jean A. Doumit
      First page: 128
      Abstract: The advance uses of Unmanned Aerial Vehicles (UAV) in geosciences by producing very high spatial resolution Digital Surface Models (DSMs), the various UAV flight altitudes led to different scales DSM. In this paper, we analyzed terrain forms using Topographic Position Index (TPI), landforms extracted by Iwahashi and Pike method and morphometric features of three different spatial resolutions DSM processed from different UAV flights height datasets of the same study area.Topographic Position Index (TPI) is an algorithm for measuring topographic slope positions and to automate landform classi'cations, Iwahashi and Pike had developed an unsupervised method for classification of Landforms and we have used the techniques developed by Peuker and Douglas, a method classifying terrain surfaces into 7 classes.Landforms extracted from the three indices listed above at the three flight heights of 120, 240 and 360 meters and compared with each other to understand the generalization of different scale and to highlight which landforms are more affected by the scale changes.

      PubDate: 2018-03-15
      DOI: 10.22158/se.v3n2p128
      Issue No: Vol. 3, No. 2 (2018)
  • Carbon Stocks of Coarse Woody Debris in Central African Tropical Forests

    • Authors: Romeo Ekoungoulou, Shukui Niu, Fousseni Folega, Donatien Nzala, Xiaodong Liu
      First page: 142
      Abstract: Coarse Woody Debris (CWD; defined here as fallen and standing dead trees and tree branches) is a critical-structural and functional component of forest ecosystems that typically comprises a large proportion of total aboveground carbon storage. Coarse woody debris estimation for the tropics is uncommon, and little is known about how carbon storage in CWD will respond to climate change. Given the predominant role that tropical forests play in global carbon cycling, this information gap compromises efforts to forecast climate change impacts on terrestrial carbon balance. In this study, we aimed to identify the variation in Coarse Woody Debris (CWD) stocks between forest types (Old-growth and selective logging forests) and among the plots in Ipendja mixed lowland terra firme tropical rainforest (central Africa), and we examined the consequence for CWD carbon stocks estimation. The study area is located at Ipendja forest management unit (UFA), close to Dongou district (Likouala Department), in Northern Republic of Congo. Data collection were done with eight rectangular plots, each 25 x 200 m (0.5 ha). The method of line intercepts sampling has been used in each studied site. A total number of 135 CWD samples of diameter ³ 10 cm in the studied plots have been recorded. It was obvious that stock of coarse woody debris in Mokelimwaekili site (mean: 19.96 Mg ha-1; sum: 79.84 Mg ha-1) were higher than those of Sombo site (mean: 8.9 Mg ha-1; sum: 35 Mg ha-1). There was a significance difference in Ipendja evergreen forest about CWD stocks across two forest types and plots. This finding suggests that values vary among forest types and that separate reference values should be adopted for estimates of undisturbed forest carbon stocks in the different ecosystems in Congo basin. Different reference values represent the variability of CWD among forest types and contribute to reducing uncertainties in current estimates of carbon stock in central African forest ecosystems.
      PubDate: 2018-04-08
      DOI: 10.22158/se.v3n2p142
      Issue No: Vol. 3, No. 2 (2018)
  • Afforestation/Reforestation Based on Gmelina Arborea (Verbenaceae) in
           Tropical Africa: Floristic and Structural Analysis, Carbon Storage and
           Economic Value (Cameroon)

    • Authors: Noiha Noumi V., Zapfack L., Pelbara P., Awe Djongmo V., Tabue Mbobda R. B.
      First page: 161
      Abstract: The study was carried out in three selected plantations. Sampling was made infive 100x20 m2 plots per site. Overall, 32 species, 36 genera and 17 families were surveyed. Hymenocardia acida, Combretum adenogonium, Daniellia oliveri, Entada africana, Terminalia macroptera, T. laxiflora, Lannea schimperi, Lophira lanceolata, Maytenus senegalensis, Ochna schweinfurthiana, Protea madiensis, Psorospermum senegalense, Piliostigma thonningii, Sarcocephalus latifolius and Securidaca longepedunculata were the most important species. The richness index ranged from 2.53±0.05-7.74±0.03. Shannon index was 3 in all sites. Density ranged from 98±2.01-253±10.23 stems/ha. Basal area was statistically significant among the sites (p<0.001). All sites were floristically similar (k>70 %). The vertical structure showed three types of figures; L shape, symmetrical bell shape and unsymmetrical bell shape. These structures confirmed a good regeneration of timbers in the sites. There was a positive correlation of the species dispersal in the sites (p<0.001). The amount of AGB was 23.50±0.38 t C/ha. The amount of C sequestration was 86.28±16.57 t CO2eq/ha. The ecosystem service payments ranged between 258.87±24.88-8629.25±248.16 €/ha with the lowest values for CDM price and the highest for REDD+price. A financing of such projects is required in the frame of creating adaptation and attenuation measures to global warming effects.
      PubDate: 2018-05-29
      DOI: 10.22158/se.v3n2p161
      Issue No: Vol. 3, No. 2 (2018)
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
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