Abstract booklet - gtÃƒÂ¶ Ã¢Â€Â“ Society for Tropical Ecology

More documents

Recommendations

Info

72 PARALLEL SESSION HALL III | EAST AFRICAN MOUNTAINPARALLEL SESSION HALL III | EAST AFRICAN MOUNTAIN 73HUMAN IMPACT ON VASCULAR PLANTS DIVERSITY, POPULATIONSTRUCTURE AND NATURAL REGENERATION OF SOUTH NANDIFOREST, KENYASession: East African mountain forests: functional ecology andSTRATEGIES TO CONSERVE A LOWER-MONTANE FOREST IN EASTAFRICA USING NATIVE TREE SPECIESAdane Girma Gebreselasse 1 , Eberhard Fischer 11University of Koblenz, Koblenz, DE, adanegirma@yahoo.com, 2 University ofKoblenz-Landau, Koblenz, DEThis study aims to investigate human impact on the plant species, communitytypes and diversity of South Nandi forest. Two sites based on their disturbancestatus were selected for this study. Totally forty-nine 20 by 20 meter plots fromboth sites (27 plots from relatively less disturbed site (Kobujoi) and 22 plotsfrom relatively highly disturbed site (Bonjoge)) were used to collect vegetationand environmental data. These plots were distributed 100 meters apart alongtransects of 1 km to 1.6 km length and the distance between adjacent transectswas 500 m. All woody plants greater than two cm diameter at breast height(DBH) and taller than 2 m were measured using diameter tape and hypsometerrespectively. Herbaceous plants and seedlings of all woody plants were recordedin five three by three meter plots within the bigger plot, at the four corners andthe centre. Each plant was identified at species level when first encounteredin the forest. For those plants which were difficult to identify at field, voucherspecimens were collected, pressed and later identified at herbarium. Multivariatestatistical analysis method was used to analyze the data. Cluster analysis andordination were undertaken using PC-ORD and CANOCO respectively. Inthis study, including those found out of study plots, in both sites totally 253plant species from 87 families and 200 genera were identified. Higher speciesrichness per plot is recorded at Kobujoi (67.1) than that of Bonjoge (50.4). Bothbasal area and number of seedlings per hectare were significantly higher (p
74 PARALLEL SESSION HALL III | EAST AFRICAN MOUNTAINPARALLEL SESSION HALL III | EAST AFRICAN MOUNTAIN 75ACCLIMATION OF TWO AFROMONTANE TREE SPECIES(PODOCARPUS FALCATUS AND CROTON MACROSTACHYS) TODIFFERENT IRRADIANCE LEVELS DETERMINED BY THINNING OF APINUS PATULA PLANTATION IN SOUTHERN ETHIOPIA.Andreas Nenninger 1 , Thorsten Grams 1 , Andreas Wasner 1 , YigremachewSeyoum 2 , Simone Strobl 3 , Hany El Kateb 1 , Reinhard Mosandl 1EFFECTS OF SILVICULTURAL MANAGEMENT PRACTICES ON THESOIL AND FOLIAR NUTRIENT STATUS OF TREE SPECIES IN THEMUNESSA FOREST, ETHIOPIAWolfgang Zech 11University of Bayreuth, Bayreuth, DE, W.Zech@uni-bayreuth.deTUESDAY 17:30 Hall H III1TU München, Freising, DE, nenningera@yahoo.de, 2 Addis Ababa University, AddisAbaba, DE, 3 University of Bayreuth, Bayreuth, DEThe remaining forest resources of Ethiopia are declining dramatically due todeforestation and degradation. Although the important role of plantationforests to foster native tree species is very well documented, studies basedon plantation management concepts focusing on how to enhance naturalregeneration of native tree species are scarce in Africa. The main objective ofthis study was to asses, how two important afromontane tree species, Crotonmacrostachys (pioneer species) and Podocarpus falcatus (late-successionalspecies),naturally regenerated in a Pinus patula plantation respond to irradiancelevels determined by four silvicultural treatments. Leaf traits, photosyntheticperformance and growth were investigated under an irradiance gradient of 1.6– 35.3 (mol / sq.m. and day) PPFD determined by the intensity of thinning. P.falcatus characterised as shade tolerant species could cope very well under highlight levels. Systematic promotion by pronounced thinning treatments seemspromising in order to establish the species on the long run and consequentlyconvert the exotic plantation into a natural forest.In Ethiopia, forest plantations with exotic tree species play an important rolein the supply of the increasing human population with fire wood and buildingmaterial. To sustain plantation productivity improved silvicultural managementpractices of these monocultures are necessary. Conversion (CV) is such a practiceaiming by intensive thinning to improve water supply of the trees and soilnutrient turnover by stimulation mineralization and thus promoting incrementand increasing timber quality. However, up to now sound knowledge about theeffects of CV, carried out by Mosandl et al. end of 2007 and at the beginning of2008, are lacking. Therefore the objectives of our studies are:1. To investigate the effects of CV on SOM and nutrient pools in the groundvegetation, in the soil organic layers, and in the upper mineral soil.2. To study the CV-effects on the mineral nutrition of tree species by foliaranalysis.3. Further we are studying the effects of mineral fertilizers on growth andsurvival rate of enrichment plantings, and in collaboration with Beck et al. onphotosynthesis and transpiration of selected tree species.About 15 months after CV mineral soil properties (SOC- and nutrient stocks,C/N-ratios, 0-5 cm) did not change. The expected C- and N-mineralization asa consequence of CV could not be shown in the surface mineral soil. But mostproperties of the organic layer changed significantly after CV, for instance theC-, N- and P-stocks increased and the C/N-ratios decreased indicating higherinputs of forest floor vegetation- and shrub-litter (with low C/N-rations). Theexploding forest floor vegetation seems to assimilate especially N, correlatingwith a decrease of N-levels in tree foliage after CV. Increased K-, Na-, Ca- and Allevelsin the organic soil layers may indicate higher dust inputs after openingthe canopy by CV and thus increasing the filter capacity of the canopy.TUESDAY 17:45 Hall H IIIgtöSociety for Tropical Ecology | Gesellschaft für Tropenökologie e.V. Status and future of tropical biodiversity | Frankfurt, 21 - 24 February 2011gtö
Page 2 and 3: PROGRAMME OVERVIEWMONDAY, 21 FEBRUA
Page 4: 2 LOCAL ORGANIZERS & SPONSORING INS
Page 7 and 8: 8MONDAY, 21 FEBRUARY 2011 | MORNING
Page 9 and 10: 12WEDNESDAY, 23 FEBRUARY 2011 | MOR
Page 11 and 12: 16WEDNESDAY, 23 FEBRUARY 2011 | AFT
Page 13 and 14: 20FRIDAY, 25 FEBRUARY 2011 | MORNIN
Page 15 and 16: 22 PLENARY KEYNOTE | HALL H IIIPLEN
Page 17 and 18: 26 PARALLEL SESSION HALL H III: THE
Page 19 and 20: 30 PARALLEL SESSION HALL H III: THE
Page 21 and 22: 34 PARALLEL SESSION HALL H IV: AFRI
Page 27 and 28: 46 PARALLEL SESSION H III: BIODIVER
Page 29 and 30: 50 PARALLEL SESSION | H III | TROPI
Page 31 and 32: 54 PARALLEL SESSION | H III | TROPI
Page 33 and 34: 58 PARALLEL SESSION | H IV | RAIN F
Page 35 and 36: 62 PARALLEL SESSION | H IV | RAIN F
Page 37 and 38: 66 PARALLEL SESSION HALL III | EAST
Page 39: 70 PARALLEL SESSION HALL III | EAST
Page 43 and 44: 78 PARALLEL SESSION HALL H IV | TRO
Page 45 and 46: 82 PARALLEL SESSION HALL H IV | TRO
Page 47 and 48: 86 PUBLIC TALK | ÖFFENTLICHER ABEN
Page 49 and 50: 90 PARALLEL SESSION HALL H III | EC
Page 55 and 56: 102 PARALLEL SESSION HALL H IV: ANI
Page 57 and 58: 106 PARALLEL SESSION HALL H IV | PL
Page 59 and 60: 110 PARALLEL SESSION HALL H III | B
Page 61 and 62: 114 PARALLEL SESSION HALL H III | B
Page 63 and 64: 118 PARALLEL SESSION HALL H IV | TR
Page 65 and 66: 122 PARALLEL SESSION HALL H III | H
Page 67 and 68: 126 PARALLEL SESSION HALL H III | H
Page 69 and 70: 130 PARALLEL SESSION HALL H IV | FR
Page 71 and 72: 134 PARALLEL SESSION HALL H III | T
Page 77 and 78: 146 PARALLEL SESSION HALL H IV | AN
Page 79 and 80: 150 PLENARY KEYNOTE THURSDAY HALL I
Page 81 and 82: 154 PARALLEL SESSION HALL H III THU
Page 83 and 84: 158 PARALLEL SESSION HALL H III THU
Page 85 and 86: 162 PARALLEL SESSION HALL H IV THUR
Page 87 and 88: 166 PARALLEL SESSION HALL H IV THUR
Page 89 and 90: 170PARALLEL SESSION HALL H IV THURS
Page 91 and 92:
172 SCIENTIFIC POSTER SESSION | FOY
Page 93 and 94:
Page 95 and 96:
Page 97 and 98:
Page 99 and 100:
Page 101 and 102:
Page 103 and 104:
Page 105 and 106:
Page 107 and 108:
Page 109 and 110:
Page 111 and 112:
Page 113 and 114:
Page 115 and 116:
Page 117 and 118:
Page 119 and 120:
Page 121 and 122:
Page 123 and 124:
Page 125 and 126:
Page 127 and 128:
244 NOTESNOTES245. . . . . . . . .
Page 129 and 130:
248 GENERAL INFORMATIONGENERAL INFO
Page 131 and 132:
252 INDEX PARTICIPANTSINDEX PARTICI
Page 133 and 134:
256 INDEX PARTICIPANTSINDEX PARTICI
Page 135 and 136:
260CONFERENCE VENUE - CAMPUS BOCKEN
show all

Abstract booklet - gtÃƒÂ¶ Ã¢Â€Â“ Society for Tropical Ecology

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?