CIFOR-ICRAF berfokus pada tantangan-tantangan dan peluang lokal dalam memberikan solusi global untuk hutan, bentang alam, masyarakat, dan Bumi kita

Kami menyediakan bukti-bukti serta solusi untuk mentransformasikan bagaimana lahan dimanfaatkan dan makanan diproduksi: melindungi dan memperbaiki ekosistem, merespons iklim global, malnutrisi, keanekaragaman hayati dan krisis disertifikasi. Ringkasnya, kami berupaya untuk mendukung kehidupan yang lebih baik.

CIFOR-ICRAF menerbitkan lebih dari 750 publikasi setiap tahunnya mengenai agroforestri, hutan dan perubahan iklim, restorasi bentang alam, pemenuhan hak-hak, kebijakan hutan dan masih banyak lagi – juga tersedia dalam berbagai bahasa..

CIFOR-ICRAF berfokus pada tantangan-tantangan dan peluang lokal dalam memberikan solusi global untuk hutan, bentang alam, masyarakat, dan Bumi kita

Kami menyediakan bukti-bukti serta solusi untuk mentransformasikan bagaimana lahan dimanfaatkan dan makanan diproduksi: melindungi dan memperbaiki ekosistem, merespons iklim global, malnutrisi, keanekaragaman hayati dan krisis disertifikasi. Ringkasnya, kami berupaya untuk mendukung kehidupan yang lebih baik.

CIFOR–ICRAF publishes over 750 publications every year on agroforestry, forests and climate change, landscape restoration, rights, forest policy and much more – in multiple languages.

CIFOR–ICRAF addresses local challenges and opportunities while providing solutions to global problems for forests, landscapes, people and the planet.

We deliver actionable evidence and solutions to transform how land is used and how food is produced: conserving and restoring ecosystems, responding to the global climate, malnutrition, biodiversity and desertification crises. In short, improving people’s lives.

L'analyse de cernes: applications aux études de croissance de quelques essences en peuplements naturels de forét dense africaine

Ekspor kutipan

Knowledge of wood production, and particularly of diameter increment of trees, is central to forest management. This is one of the parameters contributing to determination of the length of the felling cycle as well as the maximum allowable cut without impoverishment of forest stands. Two techniques can be used to assess diameter increment of trees: analysis of growth rings and periodical measurements of circumference over a given period. The results obtained with several designs, in which trees have been periodically measured for more than ten years (Mopi, Irobo and La Téné in Cote de Ivoire, Mbaiki in Central African Republic and Oyane in Gabon), provide increments for each species. In the same way, several growth ring counts were carried out for species with visible annual growth rings, especially in Cameroon, Central African Republic and Gabon. This report describes the methodology used for growth ring analysis, the application of such analysis for each tree species, as well as a synthesis of the results obtained for the main species exploited in Central and West Africa. The following species are included: Ayous/Samba (Triplochiton sideroxylon), Sapelli (Entandrophragma cylindricum), Limba/Fraké (Terminalia superba), Sipo (Entandrophragma utile), Tali (Erythrophleum ivorense), Tiama (Entandrophragma angolensis), Kosipo (Entandrophragma candollei), Okoumé (Aucoumea klaineana) and Moabi (Baillonella toxisperma). It appears that the mean diameter increment of Meliaceae (Sapelli, Sipo, Kosipo and Tiama - Entandrophragma spp.) and Iroko (Milicia excelsa) is 4-5 mm/year. The increment is 2-3 mm/year for slow-growing species, such as Bossé clair (Guarea cedrata) and Kotibé (Nesogordonia papaverifera), while mean annual increment of Okoumé (Aucoumea klaineana) is slightly under 10 mm/year for trees with diameters from 20 to 100 cm.

Publikasi terkait