Báo cáo lâm nghiệp: "Variation of stomatal resistance with leaf age in Quercus petraea: effect on the soil-water balance of an oak forest" pot

... after the leaf area index (Nizinski and Saugier, 1988; 1989a, b). We thus decided to study the effect of leaf age on stomatal resistance and on the morphology of the leaf ... oak forest. Agric. For. Meteorol. in press

Ngày tải lên: 09/08/2014, 04:20

... enquête Abstract – Consequences of weathering on the users’ aesthetic perception of oak wood (Quercus petraea (Matt.) Liebl.). The effects of weathering on the aesthetic perception of oak wood (Quercus petraea ... performed on weathered or non-weathered pairs of samples. The first inquiry, regarding non-weathered samples, showed that the users choose among two...

Ngày tải lên: 08/08/2014, 01:21

... signalling in drought con- strained situations. Do whole plant coordi- nation mechanisms account for stomatal versus leaf area transpirational compensa- tion also in nonconstrained ... for the two watering conditions and R/S was higher in the droughted than in the well-watered condi- tions on d320. other factors - by the trees ability to...

Ngày tải lên: 08/08/2014, 18:21

... death of parenchymal cell stabilizes the size of conducting area in trees of younger age classes, and then the cause and effect of the interre- lationship in the transpiring organ – conducting ... referring to the area of early wood within the sapwood zone. In the opinion of these authors such a calculated conducting area is a very good estimator of the...

Ngày tải lên: 07/08/2014, 10:21

... of the provenance and provenance region on the values of relative diameters were analyzed using the analysis of variance. Stand density is one of the hypothetic factors that may affect the ... statistically insignificant. The results of the analysis of the relationship between the stem form of larch of the tested prov- enances and the index of stand...

Ngày tải lên: 07/08/2014, 10:22

... wood. The angle of this track relative to the longitudinal direction of the boards was measured by a protractor in degrees. The mean of the pith- and bark facing readings was used in the analysis. Data ... grain angle (spiral grain) was measured by pulling a needle attached to an arm along the pith- and bark facing side of the boards. The needle followed the...

Ngày tải lên: 07/08/2014, 16:21

... initial fertilisation in P than the other stands, we cannot disentangle unambiguously the effects of P nutrition from the eventual age effect. The change in phosphorus concentration in needle cor- relates ... 32-yr-old stand; indeed, the other stands of our chronosequence never received any fertilisation. The ∆ of annual ring cellulose decreased significantly with...

Ngày tải lên: 08/08/2014, 00:22

... mainly on cones and needles [16, 17, 23]. The main objective of the present work is the analysis of the variation in morphological traits within and among Moroccan maritime pine populations. In ... largest in the lower lands of the Rif (PC) and smaller in the high-altitude population of TAD. In contrast, seeds and cones were largest in the high Rif and sm...

Ngày tải lên: 08/08/2014, 00:22

... between the inner and outer heartwood. The variation in the concentration of resin acids among the samples was large but, according to the regression analysis, the variation within the normal range ... while the correlation between the concentration of total phenolics and the concentration of resin acids was weak. The quantity of water after wetting and the c...

Ngày tải lên: 08/08/2014, 01:21

... ellagitannins of new heartwood. Measurement of insoluble tannins in two samples Table VI gives the mean concentrations of insoluble ellagitannins remaining in samples of Limousin ... vescalagin, which contrasts with the vari- ation of roburins A and C. Roburin A in- creases in concentration during the first 10 years of ageing and robur...

Ngày tải lên: 08/08/2014, 18:21