Physiological ecology of plants of the wet tropics: by E. Medina, H. A. Mooney, C. Vázquez-Yánes (auth.), E.

By E. Medina, H. A. Mooney, C. Vázquez-Yánes (auth.), E. Medina, H. A. Mooney, C. Vázquez-Yánes (eds.)

This e-book comprises the result of a Symposium at the physiological ecology of vegetation of the lowland rainy tropics held in Mexico in June 1983 equipped via the Instituto de Biologla of the nationwide college of M"exico (U. N . A. M. ), and subsidized by way of UNAM, CONACYT, NSF and UNESCO (CIET). A workshop component of the Symposium was once held on the tropical study station at Los Tuxtlas, Veracruz. This Symposium originated in keeping with the expanding curiosity within the physiological ecology of tropical crops, a result of capability. of this box to supply a simple figuring out of functioning of tropical plant groups. The examine of physiological ecology of tropical vegetation has been behind schedule from time to time via the shortcoming of conceptual framework, but in addition by means of the absence of applicable instrumentation and strategies with which to behavior special measurements lower than hot temperature, excessive humidity box stipulations. Hypotheses and ideas of the physiological ecology of tropical vegetation were dependent mostly on observational info and the research of progress varieties and leaf anatomf. The early paintings of A. F. W. Schimper and o. Stocker in Asia, and the broad surveys made by means of H. Walter at the osmotic potentials of vegetation within the tropics and subtropics, constituted, till quite lately, the single on hand details at the water and carbon relatives of tropical plants.

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Extra info for Physiological ecology of plants of the wet tropics: Proceedings of an International Symposium Held in Oxatepec and Los Tuxtlas, Mexico, June 29 to July 6, 1983

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Wash. Yearbook 71, 85-94. Bj~rkman 0, Ludlow MM, and Morrow PA (1972) Photosynthetic performaDce of two rainforest species ,in their native habitat and analysis of their gas exchange, Carnegie Jnst. Wash. Yearbook 71, 94-102. Chazdon RL and Fetcher N (1983) Photosynthetic light environments in a lowland tropical rain forest in Costa Rica, Journal of Ecology, in press. Denslow JS (1980) Gap partitioning among tropical rainforest trees, Biotropica, 12 (supplement), 47-55. Evans GC (1939) Ecological studies on the rain forest of southern Nigeria.

Germinated were not species of the mature forest due to the fact that the conditions of but nomadic pioneer species typical of light germination provided are not appropriate for gaps and early secondary successions as well as those species or to a real low number of these a few mature forest tree seeds in the soil. delayed germination. ~pecies probably having This experiment has been This might be Ng (1978) mentioned that it is always possible to find viable seeds from repeated by other researchers; Guevara and several hard-coated legumes like Anisophylea, Gomez-Pompa (1972), in Veracruz, found a great Barringtonia, number of weed seeds in the forest soil probably The small amount of mature forest tree seeds in due to the high degree of disturbance of the the soil bank may be due to the rapid area near the forest where it was done.

But also weed seeds Some of these have hard-coated seeds. In America the predominant genus found in all the studies on seed banks is Cecropia (Blum, 1968; Bell, 1970; Kellman, 1974; Prevost, 1981). Other important genera in American soil seed banks are Laetia, Palicourea, Trema, Piper, Didymopanax and several Melastomataceae. COMPOSITION OF THE SEED BANKS IN THE FOREST SOIL Several experiments have been performed to determine the "composition of the seed bank (or dormant seeds present in the soil) in tropical humid forests of the world.

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