期刊名称：Science et changements planétaires / Sécheresse
印刷版ISSN：1147-7806
电子版ISSN：1777-5922
出版年度：2007
卷号：18
期号：4
页码：289-295
DOI：10.1684/sec.2007.0106
出版社：John Libbey Eurotext
摘要：Figures See all figures Authors Ali Mahamane , Aboubacar Ichaou , JM Karimou Ambouta , Saadou Mahamane , Boubé Morou , Ibrahim Amani , Hango Mahamadou , Jean Marc d’Herbès , Philippe Gineste , Issoufou Wata , Abassa Issaka Département de biologie, Faculté des sciences, Université Abdou Moumouni, BP 10662, Niamey, Niger, Institut national de la recherche agronomique du Niger (Inran), BP429, Niamey, Niger, Faculté d’agronomie, Université Abdou Moumouni, BP 10660, Niamey, Niger, Institut de recherche pour le développement (IRD), BP 11416, Niamey, Niger, Institut de recherche pour le développement (IRD), US Désertification, BP 64501, 34394 Montpellier, France, Réseau d’observatoires de surveillance écologique à long terme (Roselt), Ministère de l’Environnement et de la Lutte contre la Désertification, BP 578, Niamey, Niger, Ministère de l’Hydraulique, de l’Environnement et de la Lutte contre la Désertification, BP 578, Niamey, Niger Key words: desertification, fallow land, Niger, soil surface condition, sustainable management, vegetation DOI : 10.1684/sec.2007.0106 Page(s) : 289-95 Published in: 2007 With a view to understanding Sahelian production systems, the Sahel and Sahara Observatory (SSO) has launched long term studies. A concrete case study conducted in Niger presents results about long term vegetation monitoring and provides information on the impact of environmental factors on vegetation dynamics in 6 fenced fallows. The indicators that can help the local population make decisions about sustainable land management have been identified and current soil surface conditions as well as plant communities have been characterized. Data measurement is based on a permanent mechanism comprising a quadrat point network, the collection of herbaceous phytomass and the assessment of different environmental parameters (topography, rainfall, soil surface conditions). Results show that the observatory’s flora is dominated by annual species which are very sensitive to rainfall and topography. We have identified two relevant indicators to alert farmers to cultivate fallows again so as to optimize their productivity (development of algal crust and stimulation of termite activities associated with the increase of litter cover). Phytodiversity and biological land productivity can thus be increased.
