Gap size effects on photoinhibition in understorey saplings in tropical rainforest Article Received: 23 December 2003 Accepted: 03 November 2004 DOI:
Cite this article as: Houter, N. & Pons, T. Plant Ecol (2005) 179: 43. doi:10.1007/s11258-004-5775-2 Abstract
The sudden increase in irradiance after canopy disturbance in primary forest together with the accompanying increase in leaf temperatures is known to cause photoinhibition in shade acclimated foliage of understorey plants. We hypothesized that there is species specific variation among understorey saplings in the magnitude of photoinhibition in response to gap creation, which is related to their requirement for overstorey disturbance. Eleven more or less circular gaps were created varying in size from 60 up to 1459 m
2. Photoinhibition was assessed by determining predawn and midday F v/ F m using chlorophyll fluorescence at two occasions during the first 3 weeks after creation of the gaps. The light environment was assessed using hemispherical photography. Five species that occurred in sufficient numbers in the understorey after gap creation were measured. They all showed an increase of photoinhibition with increasing gap size. Variation in exposure to direct sunlight within gaps contributed also to variation in photoinhibition. Dynamic photoinhibition, the overnight increase in F v/ F m, was about 20% of total photoinhibition as measured at midday. The species responded quantitatively different. Oxandra asbeckii was most sensitive as evident from a decrease of predawn F v/ F m from 0.79 in the understorey of undisturbed forest to 0.70 in the smallest and further to 0.41 in the largest gaps. Catostemma fragrans, the least sensitive species showed hardly any photoinhibition in the smallest gaps and less in the largest ones, whereas Lecythis concertiflora, Licania heteromorpha, and Chlorocardium rodiei had intermediate responses. Species rank order in sensitivity to photoinhibition was maintained across the whole range of gap sizes. The relationship between sensitivity to photoinhibition and species-specific gap size preference for regeneration is discussed. Keywords Chlorophyll fluorescence Canopy disturbance Guyana Hemispherical photography Logging effects Successional status References
Bungard, R.A., Press, M.C., Scholes, J.D. 2000 The influence of nitrogen on rain forest dipterocarp seedlings exposed to a large increase in irradiance Plant Cell Environ. 23 1183 1194 CrossRef Google Scholar
Chazdon, R.L., Pearcy, R.W., Lee, D.W., Fetcher, N. 1996 Photosynthetic responses of tropical forest plants to contrasting light environments Mulkey, S.S., Chazdon R.L. Smith, A.P eds. Tropical Forest Plant Ecophysiology Chapman & Hall New York, 5 55 Google Scholar
Ek R.C. 1997. Botanical Diversity in the Tropical Rainforest of Guyana. Tropenbos-Guyana Series, Vol. 4. Georgetown, Guyana.
Gérard, J., Miller, R.B., ter Welle, B.J.H. 1996Major Timber Trees of Guyana; Timber Characteristics and Utilization. Tropenbos Series, Vol. 15 The Tropenbos Foundation Wageningen, The Netherlands Google Scholar
He, J., Chee, C.W., Goh, C.J. 1996 Photoinhibition of Heliconia under natural tropical conditions: the importance of leaf orientation for light interception and leaf temperature Plant Cell Environ. 19 1238 1248 Google Scholar
Hubbell, S.P., Foster, R.B., O’Brien, S.T., Harms, K.E., Condit, R., Wechsler, B., Wright, S.J., de Lao, S. 1999 Light gap disturbances, recruitment limitation, and tree diversity in a neotropical forest Science 283 554 557 CrossRef PubMed Google Scholar
Kamaluddin, M., Grace, J. 1992 Photoinhibition and light acclimation in seedlings of Bischofia javanicaa tropical forest tree from Asia Ann. Bot. 69 47 52 Google Scholar
Kitajima, K. 1994 Relative importance of photosynthetic traits and allocation patterns as correlates of seedling shade tolerance of 13 tropical trees Oecologia 98 419 428 CrossRef Google Scholar
Königer, M., Harris, G.C., Pearcy, R.W. 1998 Interaction between photon flux density and elevated temperatures on photoinhibition in Alocasia macrorrhiza Planta 205 214 222 CrossRef Google Scholar
Königer, M., Harris, G.C., Virgo, A., Winter, K. 1995 Xanthophyll-cycle pigments and photosynthetic capacity in tropical forest species: a comparative field study on canopy, gap and understorey plants Oecologia 104 280 290 CrossRef Google Scholar
Krause, G.H., Weis, E. 1991 Chlorophyll fluorescence and photosynthesis: The basics Annu. Rev. Plant Physiol. Plant Mol. Biol. 42 313 349 Google Scholar
Krause, G.H., Koroleva, O.Y., Dalling, J.W., Winter, K. 2001 Acclimation of tropical tree seedlings to excessive light in simulated tree-fall gaps Plant Cell Environ. 24 1345 1352 CrossRef Google Scholar
Kursar, T.A., Coley, P.D. 1999 Contrasting modes of light acclimation in two species of the rainforest understorey Oecologia 121 489 498 CrossRef Google Scholar
Langenheim, J.H., Osmond, C.B., Brooks, A., Ferrar, P.J. 1984 Photosynthetic responses to light in seedlings of selected Amazonian and Australian rainforest tree species Oecologia 63 215 224 CrossRef Google Scholar
Long, S.P. Humphries S., Falkowski, P.G. 1994 Photoinhibition of photosynthesis in nature Annu. Rev. Plant Physiol. Plant Mol. Biol. 45 633 662 CrossRef Google Scholar
Lovelock, C.E., Jebb, M., Osmond, C.B. 1994 Photoinhibition and recovery in tropical plant species: response to disturbance Oecologia 97 297 307 Google Scholar
Lovelock, C.E., Kursar, T.A., Skillman, J.B., Winter, K. 1998 Photoinhibition in tropical forest understorey species with short- and long-lived leaves Funct. Ecol. 12 553 560 CrossRef Google Scholar
Maxwell, K., Johnson, G.N. 2000 Chlorophyll fluorescence - a practical guide J. Exp. Bot. 51 659 668 Google Scholar
Mulkey, S.S., Pearcy, R.W. 1992 Interactions between acclimation and photoinhibition of photosynthesis of a tropical forest understorey herb Alocasia macrorrhizaduring simulated canopy gap formation Funct. Ecol. 6 719 729 Google Scholar
Osmond, C.B. 1994 What is photoinhibition? Some insights from comparisons of shade and sun plants Baker, N.R. Bowyer, J.R. eds. Photoinhibition of Photosynthesis; from Molecular Mechanisms to the Field BIOS Scientific Publishers Oxford 1 19 Google Scholar
Polak, A.M., Rypkema, H.R. 1992Major Timber Trees of Guyana; a Field Guide Tropenbos Series, Vol. 2 The Tropenbos Foundation Wageningen, The Netherlands Google Scholar
Ramalho, J.C., Pons, T.L., Groeneveld, H.W., Nunes, M.A. 1997 Photosynthetic responses of Coffea arabica leaves to short term high light exposure in relation to N availability Physiol. Plant. 101 229 239 CrossRef Google Scholar
Ramalho, J.C., Pons, T.L., Groeneveld, H.W., Azinheira, H.G., Nunes, M.A. 2000 Photosynthetic acclimation to high light conditions in mature leaves of Coffea arabica L.: role of xanthophylls, quenching mechanisms and nitrogen nutrition Aust. J. Plant Physiol. 27 43 51 Google Scholar
Reich, P.B., Uhl, C., Walters, M.B., Ellsworth, D.S. 1991 Leaf lifespan as a determinant of leaf structure and function among 23 amazonian tree species Oecologia 86 16 24 CrossRef Google Scholar
Rose S.A. 2000. Seeds, Seedlings and Gaps: Size Matters. Tropenbos-Guyana Series, Vol. 9, Georgetown, Guyana.
Rose, S.A., Poorter, L. 2003 The importance of seed mass for early regeneration in tropical forests: a review ter Steege, H. eds. Long Term Changes Tropical Tree Diversity; Studies from the Guiana ShieldAfricaBorneo and Melanesia. Tropenbos Series, Vol. 22 Tropenbos International Wageningen, The Netherlands 19 35 Google Scholar
Schnitzer, S.A., Carson, W.P. 2001 Treefall gaps and the maintenance of species diversity in a tropical forest Ecology 82 913 919 Google Scholar
ter Steege H. 1997. Winphot 5: A Program to Analyze Vege-tation Indices, Light and Light Quality from Hemispherical Photographs, Tropenbos-Guyana reports 97–3., George-town, Guyana.
ter Steege, H. 2000Plant Diversity in Guyana. With Recommendations for a National Protected Area Strategy. Tropenbos Series, Vol. 18 The Tropenbos Foundation Wageningen, The Netherlands Google Scholar
ter Steege, H., Boot, R.G.A., Brouwer, L.C., Caesar, J.C., Ek, R.C., Hammond, D.S., Haripersaud, P.P., der Hout, P., Jetten, V.G., van Kekem, A., Kellman, M., Khan, Z., Polak, A.M., Pons, T.L., Pulles, J., Raaimakers, D., Rose, S.A., der Sanden, J.J., Zagt, R.J. 1996Ecology and Logging in a Tropical Rainforest in Guyana. With Recommendations for Forest Management. Tropenbos Series, 14 The Tropenbos Foundation Wageningen, The Netherlands Google Scholar
ter Steege, H., Hammond, D.S. 2001 Character convergencediversity, and disturbance in tropical rain forest in Guyana Ecology 82 3197 3212 Google Scholar
ter Steege Welch, I., Zagt, R.J. 2002 Long-term effect of timber harvesting in the Bartica TriangleCentral Guyana Forest Ecol. Manage. 170 127 144 CrossRef Google Scholar
Tüffers, A.V., Naido, G., von Willert, D.J. 1999 The contribution of leaf angle to photoprotection in the mangroves Avicennia marina (Forssk.) Vierh. and Bruguiera gymnorrhiza (L.) Lam. under field conditions in South Africa Flora 194 267 275 Google Scholar
van Dam O. 2001. Forest Filled with Gaps: Effects of Gap Size on Water and Nutrient Cycling in Tropical Rain Forest; a Study in Guyana. Tropenbos-Guyana Series, Vol. 10. Georgetown, Guyana.
van Dam O., Rose S.A., Houter N.C., Hammond D.S., Pons T.L. and ter Steege H. 1999. The Pibiri Gap Experiment. A Study of the Effects of Gap Size on MicroclimateEdaphic Conditions, Seedling Survival and GrowthEcophysiology, and Insect Herbivory. Tropenbos-Guyana reports, 99–1. Georgetown, Guyana.
van der Hout P. 1999. Reduced Impact Logging in the Tropical Rain Forest of Guyana. Tropenbos-Guyana Series, Vol. 6. Georgetown, Guyana.
van Kekem A.J., Pulles J.H.M. and Kahn Z. 1996. Soils of the Rainforest of Central Guyana. Tropenbos Guyana Series Vol. 2. Georgetown, Guyana.
Walters, M.B., Reich, P.B. 1996 Are shade tolerancesurvival, and growth linked? Low light nitrogen effects on hardwood seedlings. Ecology 77 841 853 Google Scholar
Yamashita, N., Ishida, A., Kushima, H., Tanaka, N. 2000 Acclimation to sudden increase in light favoring an invasive over native trees in subtropical islands, Japan Oecologia 125 412 419 CrossRef Google Scholar