Wood biomass functions for Acacia abyssinica trees and shrubs and implications for provision of ecosystem services in a community managed exclosure in Tigray, Ethiopia

2013 ◽  
Vol 94 ◽  
pp. 80-86 ◽  
Author(s):  
K. Giday ◽  
G. Eshete ◽  
P. Barklund ◽  
W. Aertsen ◽  
B. Muys
Forests ◽  
2021 ◽  
Vol 12 (9) ◽  
pp. 1139
Author(s):  
Roxane Sansilvestri ◽  
Mateo Cordier ◽  
Thibault Lescuyer

International policies promote renewable forms of energy to mitigate climate change. In Europe, the production of electricity using wood biomass represents one of the most popular energy alternatives. In 2012, France initiated a large-scale strategy to develop wood biomass energy. The biggest wood biomass power-plant project has been developed in the French Mediterranean area and its huge size raises several issues for the short- and long-term sustainability of local forests and associated economic sectors. The French Mediterranean forests provide four types of economic goods (private, club, common, and public goods) and multiple ecosystem services, which makes them complex to manage under an energy transition policy. In this paper, we applied three qualitative methods, namely interviews, participative workshops, and observant participation, and three conceptual models, namely (i) Ostrom’s (2010) self-organization key conditions, (ii) the types of economic goods classified according to their excludability and rivalry properties, and (iii) the ecosystem service categorization system of the Millennium Ecosystem Assessment (2005). With our methods, we show that the renewable strategy chosen in France replicates the current centralized production model based on fossil and nuclear fuels. Thus, we demonstrate that European, national, and local authorities fail to consider the multiple ecosystem services that forest management strategies should include to face the energy transition, climate change, and the other ecological challenges of the 21st century.


2021 ◽  
Vol 10 (20) ◽  
pp. 147-156
Author(s):  
Mohammed Souddi ◽  
M’hammed Bouallala

Trees and shrubs are essential components in the production of ecosystem services. The aim of this study is to evaluate the biodiversity of plantations in arid regions. A floristic inventory was carried out in three biotopes using an exhaustive sampling approach. Diversity parameters were calculated to assess phytodiversity in each biotope. A total of 23 plants species belonging to 17 families, with a dominance of eudicots at 95.65% were recorded. The dominant families were Fabaceae (17.38%), Arecaceae, Lythraceae and Tamaricaceae (8.69%). The flora was mixed with 56.52% of exotic plant species. The most predominant plant species were Phoenix dactylifera L, Tamarix aphylla (L.) H. Karst, Dodonaea viscosa (L.) Jacq, and Leucaena leucocephala (Lam.) de Wit, these species accounted for 72.74% of all individuals inventoried. Shannon’s diversity index and Piélou index of evenness range from 2.68 to 2.95 bits and 0.64 to 0.69, respectively. Simpson’s index range from 0.78 to 0.82. Hamming distance range from 21 to 43. Plantations provide ecosystem services with great importance on ornamental interest. The data collected in this study should be used for creating a floristic database. This database will be regularly updated for monitoring urban plantations. The information resulting from the monitoring will help to improve the urban forest management projects in the development plan.


2019 ◽  
Vol 3 (1) ◽  
pp. 1-14
Author(s):  
Philip Brick ◽  
Kent Woodruff

This case explores the Methow Beaver Project (MBP), an ambitious experiment to restore beaver (Castor canadensis) to a high mountain watershed in Washington State, USA. The Pacific Northwest is already experiencing weather regimes consistent with longer term climate projections, which predict longer and drier summers and stronger and wetter winter storms. Ironically, this combination makes imperative more water storage in one of the most heavily dammed regions in the nation. Although the positive role that beaver can play in watershed enhancement has been well known for decades, no project has previously attempted to re-introduce beaver on a watershed scale with a rigorous monitoring protocol designed to document improved water storage and temperature conditions needed for human uses and aquatic species. While the MBP has demonstrated that beaver can be re-introduced on a watershed scale, it has been much more difficult to scientifically demonstrate positive changes in water retention and stream temperature, given hydrologic complexity, unprecedented fire and floods, and the fact that beaver are highly mobile. This case study can help environmental studies students and natural resource policy professionals think about the broader challenges of diffuse, ecosystem services approaches to climate adaptation. Beaver-produced watershed improvements will remain difficult to quantify and verify, and thus will likely remain less attractive to water planners than conventional storage dams. But as climate conditions put additional pressure on such infrastructure, it is worth considering how beaver might be employed to augment watershed storage capacity, even if this capacity is likely to remain at least in part inscrutable.


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