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Can Kponan Yam （Dioscorea cayenensis） Full Season Tuber Sprout If Planted？

Journal of Agricultural Science and Technology(B) 2014年第4期4卷 312-320页

作者： Soro Dognimeton Ayolie Koutoua Bakayoko Sidiky Dao Daouda Yatty Kouadio Justin Gnakri Dago department of agroforestery University Jean Lorougnon Guede Daloa BP 150 Cote d Tvoire Swiss Centre for Scientific Research Abidjan 01 Cote d'lvoire

In a completely randomized blocks （RCB） plot, we planted seed from the three segments of Kponan tubers： head, median and tail portions with control Krengle. Germination began 10 d and lasted 67 d. The mean sprouting rate of the Kponan full season harvest tuber was 78.1% compared to 94% in Krengle. However, the tuber germination was progressive from head to tail with a linear evolution of the top fragments with sprouting rate up to 90% similar to Krengle. The median and distal portions sprout two and three weeks later with final raising rates reaching 68% and 71%, respectively. The full season tuber of Kponan sprouts with a good rate gave good yields for any portion of the tuber. It had a sprouting gradient oriented from the proximal portion to the distal one, while yield was better for medium seeds. The sprouting delays two weeks between proximal and medium portions and three weeks between proximal and distal portions were acceptable with regards to the total cycle of eight to nine months period. Thus, its small tubers could be planted as well as the top portion of big tuber. In terms of yield, Kponan medium seed gave the best yield 34.25 t/ha and the whole Kponan tuber yield was more than Krengle. That led to a better multiplication factor for Kponan full season tuber. The type of tuber, if available, could be used as seed for yam production. That could improve its distribution and contribute to food security.

关键词： Yam full season harvest sprout tuber yield multiplication rate C6te d'Ivoire.

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Quantification of Ecosystem Services Provided by <i>Pterocarpus lucens</i>Lepr. Ex Guill. and Perrott.: Forage Production, Timber and Carbon Sequestration in the Biosphere Reserve of Ferlo (Northern Senegal)

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American Journal of Plant Sciences 2014年第5期5卷 766-777页

作者： Daouda Ngom Emile Codjo Agbangba Thioro Fall Sekouna Diatta Léonard E. Akpo department of agroforestery Unité de Formation et de Recherche de Sciences et Technologie (UFR ST) University Assane Seck of Ziguinchor Ziguinchor Senegal department of agroforestery Unité de Formation et de Recherche de Sciences et Technologie (UFR ST) University Assane Seck of Ziguinchor Ziguinchor Senegal department of Plant Biology Faculty of Science and Technology University Cheikh Anta Diop of Dakar Dakar Senegal department of Plant Biology Faculty of Science and Technology University Cheikh Anta Diop of Dakar Dakar Senegal

This study aims at quantifying the most important ecosystem services: forage production, timber production and carbon sequestration provided by Pterocarpus lucens to local communities of Ferlo Biosphere Reserve. The results suggested that the ecological structure of Pterocarpus lucens revealed a bell-shaped form with left dissymmetric distribution indicating a predominance of individuals with small circumference and height. A regression using the software Minitab 16, with circumference and the height as explanatory variables, has allowed a development of predictive models for the estimation of the produced forage and the quantification of the timber supplied by one of the most used plant species in Sahelian pastures. Forage production of Pterocarpus lucens was estimated at 178 kg DM/ha. This large value of forage showed the predominance of this species in animal feed in the Sahel. The quantity of wood produced was 545 kg DM/ha while the quantity of above ground sequestered carbon was 325.35 kg of C/ha. Those estimations are interesting in the implementation context of the Ferlo Biosphere Reserve which aims at matching the productive capacity of ecosystems with the needs of local communities.

关键词： Ecosystem Services Regression Forage Timber Production Carbon Sequestration

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