Báo cáo lâm nghiệp: "Premiers résultats expérimentaux sur le comportement de Tabebuia heterophylla (DC) Britton et de Hymenaea courbaril L vis-à-vis de la sécheresse" pdf

... équipe,

Ngày tải lên: 09/08/2014, 06:21

... entre la pluie et l eau de la rivière avant la crue n’expliquent que partiellement les variations obser- Effets des boisements résineux purs sur l évolution de la fertilité ... porte surtout sur le calcium et le magné- sium. Mots clés: B({. I .l i 1l. 1’ B’ < ’1’ . 1’ (//1/.1’, résil1eux, feuillus, tm l ouse, altéraliol1, hila l 1s...

Ngày tải lên: 09/08/2014, 06:21

... l expression de ce caractère est donc un l ment majeur préa- lable à la prédiction et à l explication de la vigueur des arbres et des peuplements. La pousse totale annuelle de ... biologique, à savoir : a) La durée de l élongation. b) Le taux de croissance absolu moyen qui est le rapport de la valeur finale de l accroissemen...

Ngày tải lên: 09/08/2014, 06:21

... plus tôt dans les modalités avec calcaire que sur les témoins. 3.2. Taux de survic Les différences entre les taux de mortalité des plants témoins et des plants cultivés ... surtout en largeur, et de couleur vert-jaune, souvent en marbrures le long des nervures. A l automne 1984, la coloration rouge-brun des feuilles, si caractéristique...

Ngày tải lên: 09/08/2014, 06:21

... without leaves, the volume of whole root system and volume of fine roots (thinner than 2 mm) were measured in a glass scaled cylinder filled up with water. e accuracy of scaled cylinder was ... into labelled plastic bags and they were taken into a laboratory for allometric measurements. ey were deposited in a refrigerator. e measurements of fresh samples were executed. e volume ......

Ngày tải lên: 07/08/2014, 03:22

... the skeleton in the lower layers and with a rela- tively low nutrient content. Soil depth is 60–80 cm. Recently, surface humus has changed to the moder type, of which a thin layer of Ol and ... basis of regular collec- tions of needle samples and their chemical analysis. Results of the analysis were compared with Table 2, where optimum nutrition limits for macro- and mi- croelements in .....

Ngày tải lên: 07/08/2014, 10:21

... between mean values of compared parameters was evaluated by Student’s t-test for unequal sample sizes to p-value 0.01 and 0.05. RESULTS Evaluation of plantable plants Plants of approximately ... selected for the evaluation. All the other morphological traits were statistically significantly different between the compared types of planting material (bareroot transplants – plugs) (Table .....

Ngày tải lên: 07/08/2014, 10:22

... individuelle et familiale d’environ 0,2 et 0,8 respectivement. Le nombre de blessures sur la tige et la couleur des jeunes plants sont corr l s génétiquement. Il semble donc possible d’utiliser cette ... dommages dus à H. abietis. Les familles les plus vigoureuses ont été les plus attaquées, ce qui limite les possibilités d’inclure la sensibilité à l insecte dans le progr...

Ngày tải lên: 08/08/2014, 00:22

... to analysis. Because soil parameters changed very little during both sampling period soil samples belonging to both sampling period were pooled. 2.2. Methods of chemical analysis Leaf samples were ... topographic position was a composite of five subsamples collected at random beneath the plant specimens. The samples were brought to the laboratory in polyethylene bags. Soil samples were air-dr...

Ngày tải lên: 08/08/2014, 01:21

... Deneux M., L évaluation de l ampleur des changements climati- ques, de leurs causes et de leur impact prévisible sur la géographie de la France à l horizon 2025, 2050 et 2100, Office parlementaire d’évaluation ... addi- tion, the mineral element levels in the different samples were analysed. Thus, the data on dry matter combined with mineral element levels will provide a...

Ngày tải lên: 08/08/2014, 01:22