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The use of forest plantations in the semiarid Sahel regions: impacts on the abundance and diversity of soil legume-nodulating rhizobia and arbuscular mycorrhizal fungal communities

Several fast-growing and multipurpose tree species such as exotic and valuable native species have been widely used in West Africa. These man-made forest plantations usually focused upon the trees and are defined mainly in relation to their capacity to produce timber and prevent catastrophic events such as damage by wind. In recent years, however, there has been a growing awareness amongst plant ecologists and soil microbial ecologists that understanding the connectivity between their study organisms is of utmost importance. The interactions between plants and soil microorganisms are particularly important because plants represent the main pathway through which carbon, the element that severely limits microbial growth, enters into soil. From a reciprocal viewpoint, microbial associations have been pointed as an important strategy to guarantee plant survival under semiarid conditions. However, there are several recent studies that have been carried out on the devastating ecological impact resulting from anthropogenic dispersal of exotic plants. They suggest that exotic tree and shrub plantations could interact with soil microbial communities and disrupt mutualistic associations between the existing ecological associations within native communities, leading to soil fertility depletion. Given the growing body of empirical evidence of the importance of these perennial plants, it is becoming increasingly important to understand the impacts of such dispersal of man-made forestry on soil biological properties. In this chapter, we will expose and discuss some of the relevant research work that has been implemented in Sub-saharian ecosystems with special emphasis on studies that have dealt with tree plantation impacts on soil microbial communities. Particularly, we discussed here the influences of 28-years-old tree plantations of tropical, subtropical, and exotic tree species on the soil legume-nodulating rhizobia and arbuscular mycorrhizal fungal communities.

Auteur(s) : Sene, G*, Thiao, M, Manga, A, Sene, S, Khasa, D, Kane, A, Mbaye, MS, Samba-Mbaye, RT, Sylla, SN
Pages : 33–52
Année de publication : 2013
Revue : Nova Science Publishers, Inc. New York
Type : Article
Mise en ligne par : SENE Godar