Development of a method to predict natural durabilit y
of teak wood by Fourier transform near-infrared spectroscop y
jÉAKwood (Tectonagrandis), the world's most cultivate d /' high grade tropical hardwood is a high priced timbe r
because of its golden brown color, its high dimensiona l 'stability and the high natural durability due to extractives . Teak wood is known to be highly durable to moderatel y ~` durable . Short rotation affects the decay resistance of tea k
wood with consequences on its end-uses . Near infrared spectroscopy (NIRS) is useful to estimate parameters preliminar y
1
related to wood chemistry. The objectiveofthis study is therefore to develop a method to determine and correlate the decay resistance with NIR S data in order to propose N/RS like prediction tool of natural durabilityofteak.Nadine Amusant1 , Nabila Boutahar 1 ,
Nana Sarfo Agyemang Derkyi 2 , Gilles Chaix3, 1 CIRAD, UR 40, 73 rue J .-F. Breton, 34398 Montpellie r
Cedex 5, France .
1 CIRAD, UR 39, 73 rue J .-F. Breton, 34398 Montpellie r Cedex 5, France .
'Forest Research Institute, of Ghana, IRAD, Ghan a
Contact: nadine.amusantecirad .fr
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Wood samples were prepared from the outer, intermediary and internal heartwood fro m 41 trees (30 years) from Ivory Coast (Seguié plantation) . Natural durability tests wer e performed according to European standard EN 350-1 with Antrodia sp with exposur e duration of 16 weeks . A second test was carried out on twin samples with a duratio n exposure of 32 weeks in order to increase the variability of the results .FT-NIR spectra were recorded on wood blocks before fungal exposure with Bruke r FT-IR spectrometer to measure diffuse reflected light from a 10 nm spot .
i„?,, ----~ a 3 ds;rYS ,{t} cSFr~blra {~l m z.dtefhi alï~y ky d~Pa► 19 :~t5 ns,v ahs-ile (,53 ■ 16 q 2 ` • . . . ... . . .... . ... ... . . . ..om . .r .r : J
Figure 1 . nVatura/ duraó%/ity d%str%óut%onoftea.0 wood
addord%n9 to exyosure duration (n= I, and
Table 2. Contin9endy tab/e Tor duraó%/ 4' classes(nuir?óer of wood sunny/es with green óoX good pred%dt%on j ye//ow 6oX óad pred%dt%on j
¿J,4' óoX Very Zan' yred%dt%on) .
Ÿrye!ì~eTAdtar~éa~lîtlclass. 1 2 3 4 5 So4d predicticn 1 . 49 2 1 7 0 64% 4 6
I
4 0 334.ffi t3 io" - ---- . á ~~ ± 9 19 0 0 66?~ d 57 0 13 9 3 ~64G ~ 9 0 D 3 5 63R'S C O/?~/ L5iO/?1J_ High natural durability of teak wood N strong tree control .
I Wood samples from Ivory Coast belong to five classes of natural durability, but 74 % of the woo d samples are very durable according to EN 350-1 .
C Increasing the exposure time against Antrodia sp . increases the distribution of wood in all the classes . [l Increasing the exposure time of teak wood against Antrodia sp . increases the modelisation of the relativ e
mass losses with NIRS .
~ ~ ~~ 0 Volt** ~.ri~k ~ ~ :~. :, ~ _ 74 11€+ 1 ~ o , 1 Figure 2 . Co/rtyar%son
referende 3alues w%th yred%dted
3alues 7,,,, re/at%3e ir?aSS losses .
Table 1 . /VILA'S PLS da/%órat%on values (S> standard de3%at%on j
SEC3 standard error of dross 3a/%dation j deter/?%naeron dome/anon j ~P2 ratio of ~erforirtande to de 3iationi .
F'y.lar.> ;ca.:• ' ~ RI
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`.7iri : ,~ .~~
Fi7 lr,~.~ó .a 1~0 Be 0 {!?MEE
~a~5 ~,.aP~r{}LïY 1Sd 1.51. x'9 0.11 0 12 0.19 4,~i
Centre de coopératio n international e recherche agronomiqu e pour le développement o Cl RAD
