Spatial Analysis of the Woody Flora of the Djoumouna Peri-urban Forest, Brazzaville (Congo)
Victor Kimpouni,
Jean de Dieu Nzila,
Charmes-Maïdet Massamba-Makanda,
Salisou Yallo Mouhamed,
Jean-Pierre Kampe
Issue:
Volume 4, Issue 1, March 2019
Pages:
1-10
Received:
8 January 2019
Accepted:
27 February 2019
Published:
20 March 2019
Abstract: The spatial analysis of the flora of the peri-urban forest of Djoumouna has been conducted in Brazzaville, Congo. Data collection, conducted from April to August 2017, is based on a floristic inventory of 75 plots of each 400 m2 (20 m x 20 m). The study shows 898 trees of dbh ≥ 10 cm corresponding to 106 species and 36 families. The number of individuals per plot averages 11.97 ± 0.42 feet/plot while the number of species per plot averages 7.37 ± 0.30. The land used by projecting the trunk sections is on average 0.74 ± 0.05 m2/plot. The Jaccard similarity coefficient between plots is between 0 and 75% while the average Skewness is 1.26 ± 0.11. The average Shannon index is 1.77 ± 0.05 per plot with an average maximum diversity of 1.93 ± 0.04. The average Pielou index is 0.91 ± 0.01. The absolute diversity index averages 6.54 ± 0.29 while α-Fisher averages 11.44 ± 1.39. The average value of the Green index is -0.04 ± 0.01 and finally 7.55% of taxa have a rarefaction index of species between 40 and 77% compared to 92.45% where this index varies from 81 to 99%. The upward hierarchical classification and the AFC highlight the presence of floristic subfacies resulting from taxa independence. Since most species have a density of less than 1 tree.ha-1, the floristic composition is heterogeneous, resulting in insufficient natural regeneration and low resilience of this ecosystem threatened with extinction in the very short term.
Abstract: The spatial analysis of the flora of the peri-urban forest of Djoumouna has been conducted in Brazzaville, Congo. Data collection, conducted from April to August 2017, is based on a floristic inventory of 75 plots of each 400 m2 (20 m x 20 m). The study shows 898 trees of dbh ≥ 10 cm corresponding to 106 species and 36 families. The number of indiv...
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Low Land Ecosystem Rain Fed Rice (Oryza Sativa L.) Variety Adaptation at Assosa, Western Ethiopia
Addisu Dereje,
Hailemariam Solomon
Issue:
Volume 4, Issue 1, March 2019
Pages:
11-14
Received:
17 May 2019
Accepted:
8 July 2019
Published:
26 July 2019
Abstract: Benishangul Gumuze is one of the most important potential rice producing areas in Ethiopia. Six improved lowland ecosystem rice varieties were evaluated with the objective of selecting adapted lowland ecosystem rice varieties for Assosa condition. The trial was conducted at Assosa Agricultural Research Center during 2017/18 and 2018/19 cropping season using Randomized Complete Block Design at low land ecosystem. The size of the plot was 1.5m x 5m with gap of 0.5m between plot and 1.5m between blocks. Data was collected from nine agronomic parameters such as days to 50% heading days to 85% physiological maturity, plant height, panicle length number of fertile tillers, number of non-fertile tiller, number of filled grain per panicle, number of unfilled grain per panicle, and grain yield (kg/ha) and ranged 93 to 110,148 to 157, 80 to 98, 19 to 21, 4.8 to 6.1, 0.43 to 0.78, 82 to109, 10 to 29, 2001.4 to 2908.6 respectively. The mean combined analysis of two years showed that some agronomic parameters were statically highly significant different (p<0.05) while other parameters showed non-significant different. The mean square of over the year revealed that the yield (kg/ha) was highly significant different and other agronomic parameters showed the same result which have high contribution in yield increment of rice production. Among six tested rice varieties, Edeget and Demoze scored the highest grain yield (2908.6 kg/ha) and (2496.8 kg/ha) respectively. Therefore, based on objectively measured agronomic traits Edeget and Demoze were best adapted to low land rain fed rice ecosystem of Assosa until superior varieties will be investigated.
Abstract: Benishangul Gumuze is one of the most important potential rice producing areas in Ethiopia. Six improved lowland ecosystem rice varieties were evaluated with the objective of selecting adapted lowland ecosystem rice varieties for Assosa condition. The trial was conducted at Assosa Agricultural Research Center during 2017/18 and 2018/19 cropping sea...
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