Olff, Han

English

The present study was set up in order to investigate mechanisms of succession, meaning the explanation of species dynamics from the underlying process( e.g. colonization, nutrient dynamics, resource competition, vegetation structure). We investigated species dynamics during succession, quantified the compartmentation of nutrients, and measured N mineralization. Differences between speciesin growth and allocation characteristics were investigated in greenhouse experiments. Nutrient addition experiments in the field were performed in order to assess which nutrients limit productivity, and to see if different species were limited by different nutrients. ... Zie: Summar

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   University of GroningenOn the mechanisms of vegetation successionOlff, HanIMPORTANT NOTE: You are advised to consult the publisher's version (publisher's PDF) if you wish to cite fromit. Please check the document version below.Document VersionPublisher's PDF, also known as Version of recordPublication date:1992Link to publication in University of Groningen/UMCG research databaseCitation for published version (APA):Olff, H. (1992). On the mechanisms of vegetation succession. s.n.CopyrightOther than for strictly personal use, it is not permitted to download or to forward/distribute the text or part of it without the consent of theauthor(s) and/or copyright holder(s), unless the work is under an open content license (like Creative Commons).The publication may also be distributed here under the terms of Article 25fa of the Dutch Copyright Act, indicated by the “Taverne” license.More information can be found on the University of Groningen website: https://www.rug.nl/library/open-access/self-archiving-pure/taverne-amendment.Take-down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediatelyand investigate your claim.Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons thenumber of authors shown on this cover page is limited to 10 maximum.Download date: 06-06-2022)ecies for thet) and base elevationotal numer of plos per!d I domiout (%) in umrctt 2 3 4 6203SummaryThe present study was set up in order to investigate mechanisms of succession,meaning the explanation of species dynamics from the underlying process (e.g.colonization, nutrient dynamics, resource competition, vegetation structure).We investigated species dynamics during succession, quantified thecompartmentation of nutrients, and measured N mineralization. Differencesbetween species in growth and allocation characteristics were investigated ingreenhouse experiments. Nutrient addition experiments in the field wereperformed in order to assess which nutrients limit productivity, and to see ifdifferent species were limited by different nutrients.Three research areas were selected which clearly differed in the landscape-level boundary conditions for vegetation succession:(i) Grasslands which are cut annually, and are located in the Drentse A NatureReserve, the Netherlands (53oN, 6o42'E), where succession started after theapplication of fertilizers to these grasslands was stopped,(ii) Dunes and dune slacks on the island of Schiermonnikoog, the Netherlands(53o29'N, 6ol2'E), where vegetation succession started on bare soil in a beachplain area,(iii) The salt marsh of the island of Schiermonnikoog (53o29'N, 6o42'E) wherevegetation succession started on bare sand plates in the Wadden sea, andherbivores played an interesting role since the area was important for springstaging of Brent geese (Branta bernicla).The last two sites are rclatively free from human impact, so that undisturbedsuccessional sequences up to 100 years could be reconstructed. The Drentse Aarea has a long history of agricultural use of the grasflwtds.Snccessrbn i  the grassland series proceeded wittr decreasing productivity,decreasing pool sizes of N and P in the soil, decreasing N mineralization andquick species replacement. Species diversity was highest in the lastsuccessional stage which was characterized by multiple nutrient limitation.Since furthennore different species responded differently to various nutrients,different species might be limited by different nurrients, which might partlyexplain the high species diversity in this field. We did not find the expectedtrade-off from species with high allocation to shoots in the productive stages, tospecies with high allocation to roots in the unproductive stages. Instead,allocation pattems were very plastic within species, which differed mainly inshoot architecture. The most successful species under productive conditionsseemed to be the tallest species which can increase their specific leaf area underconditions of light limitation.Succession in the coastal dunes proceeded with increasing accumulation ofnitrogen in the soil and in the ecosystem. A fertilizer application experiment inan early successional stage revealed that the vegetation was mainly limited byt.0 0.0 0.0 0.0 7.70.0 13.0 lz.a 0.2 1.4l3 rA 56.5 ,1t.5 n.rDO 2.0 0.7 53 1.1D2 0.2 0.5 lt 20.70.0 0.0 0.0 0.0 8.900 7.0 L2.t 26.9 93.09.t 0.0 0.0 0.0 0.0rr 69.7 13.r 66.t s7.9t:t l9.t n.5 9.6 0.00J 0.5 23.2 04 0.4DO 0.0 0.0 0.0 0.40.0 9.t 0.2 0.0 0.000 0.0 0.0 51 0.02.6 80.0 76.1 60.t 0.000 0.0 0.0 0.0 0.200 0.0 0.0 0.0 0.?09 64.2 m3 22.1 5.500 0.0 0.0 0.0 0.000 0.0 0.0 0.0 l.t5.6 r5.9 lr.l 0.0 0.07t 0.2 2.5 0.0 0.06t 0.0 0.0 0.0 0.0)í 0.0 0.0 00 0.01.2 r2:l 1.6 7.r 0.0)o 0.0 0.0 0.0 1.13 0.0 0.7 0.9 0.02MN in this stage. During succession, taller species replaced smaller species, whilelight interception increased. This suggests an increasing importance of lightcompetition with increasing accumulation of N in the ecosystem.The distribution of plant species on the salt marsh was found to be determinedby two important processes: elevation towards sea-level and successional age.Contrary to the prevailing opinion, these factors appeared to be relativelyindependent. Succession on the low salt marsh proceeded with a high rate of Naccumulation in the soil, which was higher than in the dune system. This highervalue is probably caused by a higher input rate by the sediment. Brent geeseshowed a clear preference for species occurring in a specific early successionalstage, low on the salt marsh. This preference is discussed with respect to theexpected effects of salinity and nitrogen accumulation on phytomass productionand quality.SAÍ\De srSomrverhoovergespronderbelanVervrplaatssucceook rwaarcorganherstehecft rof varen ootand erinzichVerkmoet linterarconcunutriesterk '7n wteigenrvan v(tusseren liclnutriemicroplantebijvocplantehebbeweer Ibepaltstaan

On the mechanisms of vegetation succession

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On the mechanisms of vegetation succession

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