Stratification of tropical forests as seen in leaf by B. Rollet

By B. Rollet

This quantity is the final contribution of a chain of With the current ebook, one other hole trouble­ stories thinking about the plant fabric of 1 ing leaf morphology and leaf venation, to boot and an identical quarter of Venezuelan Guiana. The as a few structural peculiarities of physiological significance, is closed in order that an exhaustive survey stories originated via a collaboration with the wooded area engineer Dr. B. Rollet, the FAO specialist in of bark and leaf morphology and anatomy in addition woodland stock who amassed the fabric of tree as of fruit and seed constitution of the vegetation of a barks, leaves, culmination and seeds in Venezuelan definite famous sector is herewith given. now not Guiana round the "Rio Grande", "EI Paraiso", basically have been enormous quantities of species studied, yet and "EI Dorado" camps. within the first position, tree structural features have been relating to "forest barks of approximately 280 species of dicotyledons stratification", i. e. to the several micro climatic belonging to forty eight households have been studied (family via stipulations within the woodland, because the top of the timber family members) via Roth in separate courses which and shrubs studied was once recognized. it really is of universal as a rule seemed in Acta Botanica Venezuelica wisdom that during the decrease woodland layers, gentle is a and in Acta Biol6gica Venezuelica (see the bibli­ restricting issue, whereas humidity is adequately avail­ ography in Roth 1981).

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48 • 28. 18. 25 Fig. 6. DISTRIBUTION OF CUMULATED FREQUENCIES OF SIMPLE LEAVES as a FUNCTION OF AN INFERIOR LIMIT OF LEAF AREA. With and without Cocc%ba (see Figure 7). Are leaves belonging to the shrub or undergrowth layers larger on the whole than leaves in codominant and emergent trees? Are juvenile leaves larger than adult leaves of the same species? The leaf areas of individuals with measured total height are arranged in four height classes < 9 m; 10-19 m; 20-29 m; ~30 m. Means and standard deviations are computed for each height class in two cases: simple leaves plus leaflets of compound leaves; total leaf area for all leaves (Table 37).

Hierrito blanco); Anaxogorea sp. (Annonaceae, v. n. Yarayara amarilla). Brownea latifolia (Caesalpiniaceae, v. n. Rosa de montana); Cmdia glaberrima (Caesalpiniaceae, v. n. Arepito rebalsero); Guarea schomburgkii (Meliaceae, v. n. Carapillo). 30 Pink: Catostemma commune (Bombacaceae, v. n. Baraman, on seedlings); Mouriri sideroxylon (Melastomaceae, v. n. Guarataril10). Carmine: Carapa guianensis (Meliaceae, v. n. Carapa); Inga alba (Mimosaceae, v. n. Guamo colorado); Licania alba (Chrysobalanaceae, v.

Corrected leaf density dj and total height of trees. 243 Table 43. Leaf density d and total height of trees. 173 The variation of d; with height is quite different from d; di shows a maximum for height class 10-29 m. However, differences between height class means are not significant; since the general distribution of di is unimodal, it may be accepted that corrected densities are rather the same at any height of the forest profile: this result is a possible consequence of sparse observational data.

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