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Abstract Zobi IC:
"The use of covariance analysis to improve a forestry experimentation precision",
Journal of Applied Sciences and Environmental Management 12 (1) : 127-131 (Mar 2008)

Keywords    
Abstract   The effect of a thinning method on a tropical forest dynamics was examined using an experimental approach. This method is closed to forestry economy and it consists in eliminating non commercial species trees in order to increase the ingrowth rate of the whole commercial ones. This paper shows how a statistical technique, covariance analysis, can be used to cure an insufficiency of the experimental material. This insufficiency results here in inequality between initial total basal area of the treated quadrats and that of the untreated quadrats. The profit of precision is 1.054. It provided the following estimates of the increase rate in basal area of the commercial species: 0.73 and 0.92 m2/ha/year respectively for the treated quadrats and the untreated quadrats. When initial total basal area of the quadrats is not regarded as an auxiliary variable, the equivalent values are 0.53 and 1.05 m2/ha/year.
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Source link   http://www.bioline.org.br/pdf?ja08020
Included Refrences   24 References (List...)
Cited by other Articles   0 Citations (List...)

Authors:

 1 record found.
Name Affiliation Home page e-mail Total pubs 
Zobi ICInstitut National Polytechnique Houphouet Boigny (INPHB) Departement Eaux, Forets et Environnement (FOREN) B.P. 2661, Yamoussoukro, Cote d'Ivoire iriezobi@yahoo.com1

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References included in article:

 24 records found.
Order of appearence Full citation SRCosmos Link 
1Atkinson AC, Donev AN,
(1992). Optimum experimental designs. Oxford, Clarendon, 328p.		 
2Aznar J, Guijarro F,
(2007). Estimating regression parameters with imprecise input data in an appraisal context European. Journal of Operational Research, 176 (3): 1896-1907.		 
3Balboa-Murias MA, Rodriguez-Soalleiro R, Merino A, Alvarez-Gonzalez JG,
(2006). Temporal variations and distribution of carbon stocks in aboveground biomass of radiata pine and maritime pine pure stands under different silvicultural alternatives. Forest Ecology and Management, 237 (1-3): 29-38.		 
4Bernard C,
(1984). Introduction a l'etude experimentale. Flammarion (Champs), Paris, 318p.		 
5Bernhard-Reversat F,
(1975). Recherches sur l'ecosysteme de la foret subequatoriale de basse Cote d'Ivoire. Les cycles des macroelements. Terre et Vie 29: 229-254.		 
6Blanco JA, Imbert BJ, Castillo FJ,
(2006). Influence of site characteristics and thinning intensity on litterfall production in two Pinus sylvestris L. forests in the western Pyrenees. Forest Ecology and Management, 237 (1-3): 342-352.		 
7Chave J,
(2000). Dynamique spatio–temporelle de la foret tropicale. Ann. Phys. Fr. 25, n°6, 184p.		 
8Dagnelie P,
(1998). Statistiques theorie et applique– Tome 2 : Inference statistique a une et a deux dimensions. Paris et Bruxelles, De Boeck et Larcier, 659p.		 
9Dahdouh-Guebas F, Koedam N,
(2006). Empirical estimate of the reliability of the use of the Point-Centred Quarter Method (PCQM): Solutions to ambiguous field situations and description of the PCQM+ protocol. Forest Ecology and Management, 228 (1-3): 1-18.		 
10Dixon P, O-Reilly T,
(1999). Scientific Versus Statistical Inference. Canadian Journal of Experimental Psychology, 53 (2): 133-149.		 
11Foster JR,
(2001). Statistical power in forest monitoring. Forest Ecology and Management, 151 (1-3): 211-222.		 
12Goupy J,
(1999). Plans d’experiences pour surfaces de reponses. Paris, Dunod, 409p.		 
13Guimaraes PR, Guimaraes P,
(2006). Improving the analyses of nestedness for large sets of matrices. Environmental Modelling & Software, 21 (10): 1512-1513.		 
14Headley TR, Herity E, Davison L,
(2005). Treatment at different depths and vertical mixing within a 1-m deep horizontal subsurface-flow wetland. Ecological Engineering, 25 (5): 567-582.		 
15Inglot T, Ledwina T,
(2006). Asymptotic optimality of new adaptive test in regression model. Annales de l'Institut Henri Poincare (B). Probability and Statistics, 42 (5): 579-590.		 
16Jaakkola T, Makinen H, Saranpaa P,
(2006). Wood density of Norway spruce: Responses to timing and intensity of first commercial thinning and fertilisation. Forest Ecology and Management, 37 (1-3): 513-521.		 
17Kanninen M, Perez D, Montero M, Viquez E,
(2004). Intensity and timing of the first thinning of Tectona grandis plantations in Costa Rica: results of a thinning trial. Forest Ecology and Management, 203 (1-3): 89-99.		 
18Mead R,
(1988). The design of experiments: statistical principles for practical applications. Cambridge, University Press, 620p.		 
19Pines A, Lemesch C, Grafstein O,
(1992). Regression analysis of time trends in occupational accidents (Israel, 1970–1980). Safety Science, 15 (2): 77-95.		 
20Roose E,
(1981). Dynamique actuelle des sols ferralitiques et ferrugineux tropicaux d'Afrique occidentale. ORSTOM., Travaux et Documents, 569p.		 
21Snedecor GW, Cochran WG,
(1989). Statistical methods. 8th edition. Ames, Iowa: Iowa State University Press, 503p.		 
22Utsugi E, Kanno H, Ueno N, Tomita M, Saitoh T, Kimura M, Kanou K, Seiwa K,
(2006). Hardwood recruitment into conifer plantations in Japan: Effects of thinning and distance from neighboring hardwood forests. Forest Ecology and Management, 237 (1-3): 15-28.		 
23Vennetier P,
et Laclavere G., (1983). Atlas de Cote d'Ivoire. Paris, France, (ED) Jeune Afrique, 72p.		 
24Zobi IC,
(2002). Contribution a la gestion sylvicole des forets humides ivoiriennes a travers l’analyse des dispositifs permanents de Mopri et d’Irobo. These de doctorat. Universite Claude Bernard Lyon 1, 158p.