Interpreting Botanical Progress April-June 1999 Desert Rocks - Plant Refugia in the Near East Avinoam Danin.................................................................93 N:P Balance in Wetland Forests: Productivity Across A Biogeochemical Continuum B.G. Lockaby and W.H. Conner.................................................171 Instructions to Contributors Order Form
Desert Rocks - Plant Refugia in the Near East AVINOAM DANIN Department of Evolution, Systematics, and Ecology The Alexander Silberman Institute of Life Sciences The Hebrew University of Jerusalem Jerusalem, Israel 91904 I. Abstract II. Introduction A. Environmental Conditions in the Study Area 1. Topography 2. Geomorphology and Edaphic Conditions 3. Climate B. Flora C. Vegetation of Israel, Jordan, and Sinai III. Smooth-faced Rock Outcrops in Desert, Distribution and Significance as a Habitat for Plants A. Fine-grained Particles in the Soil Pockets and Their Origin B. Limestone and Dolomite Rocks C. Magmatic and Metamorphic Rocks D. Sandstones 1. Rock Varnish 2. Cryptoendolithic Cyanobacteria and Green Algae 3. Epilithic Crustose Lichens and Their Role in Smooth-face Development 4. Mosses and Their Role in the Sandstone Ecosystem E. Chert (Flint) IV. The Impact of Rock, Soil, and Climate on Floristic Parameters A. Number of Individuals B. Species Diversity C. Rarity Index of Rock Species D. Phytogeography E. Endemic Species F. Conclusions V. Major Key Refugia in the Near Eastern Deserts A. Nahal Elot, the Negev Highlands B. Gebel Halal, Northern Sinai C. Gebel Serbal, Southern Sinai D. Tafila - Petra - Ras en Naqb Area, Southwestern Jordan E. Wadi Rum Area, Jordan VI. Concluding Remarks A. Fitness of Population Structure of Rock Plants with Extinction Theories B. Climatic Changes and Floristic Disjunctions in the Saharan and Near Eastern Areas 1. Climatic Changes in Africa and Relicts in Central Saharan Mountains 2. Climatic Oscillations in the Near East since the Pleistocene C. Conclusions VII. Acknowledgments VIII. Literature Cited IX. Appendix: Plant Name Index Click Here to Go to Back to TopI. Abstract The outcrops of smooth-faced rocks in the Near Eastern deserts function as refugia for plants that do not fit the present local climate. They survived in the area from periods when the continuous extensions of the moister climate enabled their penetration from the Mediterranean zone. The largest Mediterranean enclave in the Near Eastern deserts and steppes is the sandstone and limestone outcrops at the upper escarpments of the southwestern Jordanian plateau, between At Tafila and Ras en Naqb, including the famous Petra and Wadi Dana. Hundreds of Mediterranean relict species and dozens of endemic species coexist in the crevices of these rocks with steppe and desert species. This paper discusses the ecology, phytogeography, and distribution of this special habitat in Jordan, Sinai, and Israel. Climatic oscillations during the Pleistocene and Holocene in the Near East and Africa are compared in their influence on past and present floras. Click Here to Go to Back to Top N:P Balance in Wetland Forests: Productivity Across A Biogeochemical Continuum B.G. LOCKABY School of Forestry 108 M.W. Smith Hall Auburn University Auburn, AL. 36849-5418 U.S.A. W.H. CONNER Baruch Forest Science Institute P.O. Box 596 Clemson University Georgetown, SC 29442 U.S.A. To whom all correspondence should be addressed. I. Abstract/Résumé II. Introduction III. Elemental Ratios as Indicators of Biogeochemical Balance IV. Oligotrophic vs Eutrophic Wetland Forests V. Aboveground Productivity vs Hydrology VI. N:P Balance and Deficiency in Wetland Forests VII. The N:P Balance Continuum in Wetland Forests VIII. Concluding Remarks IX. Literature Cited I. Abstract The nature of and driving forces behind variation among wetland forests in terms of biogeochemistry and vegetation production are not well understood. We suggest that insight into biogeochemical and productivity differences may be gained by examining the degree to which nitrogen and phosphorus are balanced within wetland vegetation. Based on examinations of data related to N/P balance and nutrient use efficiencies, vegetation productivity in both depressional and riverine forests appears to be primarily N limited. In contrast to some current theories of wetland biogeochemistry, these data suggest that, when P deficiency occurs at all, it represents a secondary productivity constraint in comparison to N. Similarly, a biogeochemical continuum is suggested for wetland forests based on the relationship between N/P ratios in senesced foliage vs. annual litterfall mass. We theorize that the position of a particular wetland forest on this continuum reflects the integration of its geomorphic position and biogeochemical history. In addition, the position of a particular system on the continuum may have predictive value with regard to net primary productivity and nutrient transformation capabilities. Click Here to Go to Back to Top Résumé La nature et les forces agissantes à l'origine de la variation parmi les forêts marécageuses en ce qui concerne la biogéochimie et la production de la végétation ne sont pas bien comprises. Nous suggérons que la compréhension des différences entre la biogéochimie et la productivité peut être atteinte en examinant le degré auquel l'azote et le phosphore sont tenus en équilibre dans la végétation des marécages. Basé sur les études des données qui sont lieés à l'équilibre entre l' azote et le phosphore (A/P) dans le feuillage et les efficacités de l'utilisation des substances nutritives, la productivité de la végétation dans les forêts dépressionelles et les forets fluviales semble être pour la plupart restreinte à l' azote. Par opposition à quelques théories courantes de la biogéochimie des marécages, ces données suggèrent que, lorsque un manque de phosphore se produit, il représente une contrainte secondaire sur la productivité par rapport à l'azote. Et de même, un continuum biogéochimique est suggéré pour les forêts marécageuses fondé sur le rapport entre les proportions (A/P) pour les masses de feuillage tombées automnal et annuel. Nous émmetons l'hypothèse que la position d'une forêt marécageuse particulière sur ce continuum montre bien l'intégration entre sa position géomorphique et son histoire biogéochimique. En plus, la position d'un système particulier sur ce continuum pent avoir une valeur prévisible en ce qui concerne la productivité primaire nette et les capacités des substances nutritives de se transformer. Click Here to Go to Back to TopINSTRUCTIONS TO CONTRIBUTORS These guidelines are intended to increase the uniformity of manuscripts and will speed the editorial and review process. Authors are encouraged to contact the Editor (THE BOTANICAL REVIEW, the NYBG Press, The New York Botanical Garden, Bronx, NY 10458-5126, USA) whenever a contribution has some special requirement that is not discussed in the following guidelines. GENERAL: Manuscripts must be received in final form, fully revised and checked for typographical and other errors. 1. Submit your manuscript assembled in the following sequence: First page - Title, author(s), addresses), running head. Table of Contents - Begin on new page. Capitalize all proper nouns. Do not include page numbers. Make sure headings agree exactly with headings in text. Primary headings are preceded by a roman numeral, secondary headings with a capital letter, tertiary headings with an arabic numeral, and quaternary headings with a lowercase letter. Abstract - Begin on new page. 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Unpublished research and personal communications may be cited in the text but not in the Literature Cited. Thus, (P. Endress, unpubl.) or (P. Endress, pers. comm.), LITERATURE CITED: 1. List entries in alphabetical order by first author, then second author. Entries for works by 3 or more authors are placed after the 2-author works by the same first author. If there are two or more works cited by the same author(s) (names in the same order), arrange chronologically. 2. Use long dash for repeated author(s) (see sample below). 3. Journal citations should be abbreviated according to Botanico-Periodicum-Huntianum. 4. Underline generic and specific names only (and do not use italics). 5. Citations designated as "in press" must have been accepted for publication, and the name of the journal or press given. They are listed as "in press" until actually published. 6. There should be a period and a space after each initial in an author's name. SAMPLES OF LITERATURE CITED: Allen, A. 1977. Steps toward better scientific illustrations. Ed. 2. Allen Press, Lawrence, Kansas. Alston, R. E. 1968. The genetics of phenolic compounds. Pages 171-204 in J. B. Harborne (ed.), Biochemistry of phenolic compounds. Academic Press, New York. CBE Style Manual Committee. 1983. CBE style manual: A guide for authors, editors, and publishers in the biological sciences. Ed. 5. Council of Biology Editors, Bethesda, Maryland. Dahlgren, R. M. T., H. T. Clifford & F. F. Yeo. 1985. The families of monocotyledons: structure, evolution, and taxonomy. Springer-Verlag, New York. Funk, V. A. 1982. Systematics of Montanoa Cerv. (Compositae). Mem. New York Bot. Gard. 36:1-133. _____& D. R. Brooks. 198 1. Advances in cladistics. The New York Botanical Garden, Bronx, New York. Gifford, E. M. & A. S. Foster. 1988. Morphology and evolution of vascular plants. Ed. 3. W. H. Freeman, New York. Takhtajan, A. 1980. Outline of the classification of flowering plants (Magnoliophyta). Bot. Rev. 46:225-359. 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Send original illustrations and/or high-quality black-and-white glossy photographs or photostats of them. Click Here to Go to Back to TopNEW BOOKS RECEIVEDThe Botanical Review thanks the publishers who have provided books for this listing. Publishers wishing to have their books considered for inclusion in this list should write to The Botanical Review/New Books Received/NYBG Press, The New York Botanical Garden, Bronx, NY 10458-5126. Chapman, W., V. A. Chapman, A.E. Bessette, A.R. Bessette, and D.R. Pens. 1998. Wildflowers of New York In Color. ISBN: 0-8156-2746-7 (hardback), 0-8156-0470-X (paper). Syracuse University Press, 1600 Jamesville Avenue, Syracuse, NY 13244-5160. Price: $59.95 hardback; $24.95 paper. Nazarea, V. 1997. Cultural Memory and Biodiversity. ISBN: 0-8165-1681-2. 189 pp. University of Arizona Press, 1230 N. Park Ave., Ste. 102, Tuscon, ZA 85719. Price: $40.00 hardback. Prasad, V.P., D. Mason, and J. E. Marburger. 1998. Illustrated Flora of Keoladeo National Park. ISBN: 0-19-564227-9. 228pp. Oxford University Press, 198 Madison Avenue, New York, NY 10016. Price $35.00 paper. Ross, Ivan A. 1998. Medicinal Plants of the World. ISBN: 0-896-03542-5. 415pp. The Human Press, 999 Riverview Drive, Suite 208, Totowa, NJ 07512. Price $99.50 hardback. Seddon, G. 1997. Landprints: Reflections on Place and Landscapes. ISBN: 0-521-58501-5. 253 pp. Cambridge University Press, 40 W. 20th St., New York, NY 10011-4211. Price: $69.95 hardback. Stainton, Adam. 1997. Flowers of the Himalaya. ISBN: 0-19-564415-8. 228pp. Oxford University Press, 198 Madison Avenue, New York, NY 10016. Price $14.95 paper. Click Here to Go to Back to Top