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Chinese Journal of Plant Ecology >
EFFECTS OF LIGHT ON SEED GERMINATION AND SEEDLING ESTABLISHMENT OF A TROPICAL RAINFOREST CANOPY TREE, POMETIA TOMENTOSA
Received date: 2007-02-05
Accepted date: 2007-04-28
Online published: 2007-11-30
Aims Pometia tomentosa is the major dominant species in the tropical seasonal rain forests of Xishuangbanna, Southwest China. It is listed in the rare and endangered species in China. Research on seed and seedling ecology of P. tomentosa may provide information for rare and endangered species conservation and forest restoration.
Methods Shade house and forest experiments were designed to investigate light effects on seed germination and seedling establishment of P. tomentosa. Seedling growth, biomass allocation and physiological properties of P. tomentosa were examined in neutral-density shade houses, which were used to mirror different light levels in centers of forest gaps, at edges of forest gaps and forest understory.
Important findings Results showed that final seed germinations in all treatments were greater than 95% and occurred within six days. Seedlings in 30% light treatment had the highest root mass ratio (RMR) and stem mass ratio (SMR). However, seedlings in 10% and 3.5% light treatments had the highest leaf mass ratio (LMR). Seedlings grown in low light environments (such as 10% and 3.5% light treatments) had a higher leaf area ratio (LAR) than those in high light (30% light treatment). Seedlings in 30% light treatment had the highest maximum photosynthetic rate (Pnmax), dark respiration (Rd) and light saturation point (Isat), but the compensation point (Icomp) was not significantly different among the three light treatments. Seedlings of P. tomentosa were able to grow slowly and survive for a long time; therefore, it is a shade tolerant species. Also, seedlings of shade houses showed increased RGRM and RGRH in high light comparing with low light. It is concluded that gaps in the forest canopy are probably necessary for successful regeneration of P. tomentosa. Soil moisture also may affect the habitat selection of P. tomentosa seedlings.
Key words： seedling growth; relative growth rate; shade tolerance; Xishuangbanna
YU Yang, CAO Min, ZHENG Li, SHENG Cai-Yu . EFFECTS OF LIGHT ON SEED GERMINATION AND SEEDLING ESTABLISHMENT OF A TROPICAL RAINFOREST CANOPY TREE, POMETIA TOMENTOSA[J]. Chinese Journal of Plant Ecology, 2007 , 31(6) : 1028 -1036 . DOI: 10.17521/cjpe.2007.0130
| [1] | Agyeman VK, Swaine MD, Thompson J (1999). Responses of tropical forest tree seedlings to irradiance and the derivation of a light response index. Journal of Ecology, 87,815-827. |
| [2] | Ashton PMS, Gunatilleke CVS, Gunatilleke IAUN (1995). Seedling survival and growth of 4 Shorea species in a Sri-Lankan rainforest. Journal of Tropical Ecology, 11,263-279. |
| [3] | Augspurger CK (1984). Seedling survival of tropical tree species: interactions of dispersal distance light gaps and pathogens. Ecology, 65,1705-1712. |
| [4] | Balderrama SIV, Chazdon RL (2005). Light-dependent seedling survival and growth of four tree species in Costa Rican second-growth rain forests. Journal of Tropical Ecology, 21,383-395. |
| [5] | Baskin JM, Davis BH, Baskin CC, Gleason SM, Cordell S (2004). Physical dormancy in seeds of Dodonaea viscosa (Sapindales, Sapindaceae) from Hawaii. Seed Science Research, 14,81-90. |
| [6] | Bassman JH, Zwier JC (1991). Gas exchange characteristics of Populus trichocarpa, Populus deltoides and Populus trichocarpa×Populus deltoides clones. Tree Physiology, 8,145-159. |
| [7] | Bazzaz FA (1991). Habitat selection in plants. American Naturalist, 137(Suppl.),116-130. |
| [8] | Bloor JMG (2003). Light responses of shade-tolerant tropical tree species in north-east Queensland: a comparison of forest and shade house grown seedlings. Journal of Tropical Ecology, 19,163-170. |
| [9] | Bloor JMG, Grubb PJ (2003). Growth and mortality in high and low light: trends among 15 shade-tolerant tropical rain forest tree species. Journal of Ecology, 91,77-85. |
| [10] | Cai ZQ (蔡志全), Cao KF (曹坤芳), Qi X (齐欣) (2003a). Photoinhibition of photosynthesis in leaves of two developing stages of a tropical rainforest canopy tree Pometia tomentosa. Acta Phytoecologica Sinica (植物生态学报), 27,210-217. (in Chinese with English abstract) |
| [11] | Cai ZQ (蔡志全), Cao KF (曹坤芳), Zheng L (郑丽) (2003b). Photosynthetic induction in seedlings of six tropical rainforest tree species. Acta Phytoecologica Sinica (植物生态学报), 27,617-623. (in Chinese with English abstract) |
| [12] | Cao M (曹敏), Fu XH (付先惠), Yang YG (杨一光), Tang Y (唐勇), He YT (何永涛) (2001). Patch dynamics in tropical forests and the maintenance of tree species diversity. Chinese Biodiversity (生物多样性), 8,172-179. (in Chinese with English abstract) |
| [13] | Cao M, Zhang JH, Feng ZL, Deng JW, Deng XB (1996). Tree species composition of a seasonal rain forest in Xishuangbanna, Southwest China. Tropical Ecology, 37,183-192. |
| [14] | Cao M, Zou XM, Warren M, Zhu H (2006). Tropical forests of Xishuangbanna, China. Biotropica, 38,306-309. |
| [15] | Chin HF, Krishrapillay B, Stanwood PC (1989). Seed Moisture: Recalcitrant vs. Orthdox Seeds. CSSA Special Publication, Wisconsin , USA. |
| [16] | Condit R, Hubbell SP, Foster RB (1996). Assessing the response of plant functional types to climatic change in tropical forests. Journal of Vegetation Science, 7,405-416. |
| [17] | Dalling JW, Harms KE, Aizprua R (1997). Seed damage tolerance and seedling resprouting ability of Prioria copaifera in Panama. Journal of Tropical Ecology, 13,481-490. |
| [18] | Dupuy JM, Chazdon RL (2006). Effects of vegetation cover on seedling and sapling dynamics in secondary tropical wet forests in Costa Rica. Journal of Tropical Ecology, 22,65-76. |
| [19] | Fu LG (傅立国) (1989). The Rare and Endangered Plant in China (中国稀有濒危树种). Shanghai Education Press, Shanghai. (in Chinese) |
| [20] | Harper JL (1977). Population Biology of Plants. Academic Press , London. |
| [21] | Huante P, Rincon E (1998). Responses to light changes in tropical deciduous woody seedlings with contrasting growth rates. Oecologia, 113,53-66. |
| [22] | Hunt R (1982). Plant Growth Curves: the Functional Approach to Plant Growth Analysis. Edward Arnold, London. |
| [23] | Kermode AR, Finch-Savage BE (2002). Desiccation sensitivity in orthodox and recalcitrant seeds in relation to development. In: Black M, Pritchard HWeds. Desiccation and Survival in Plants: Drying Without Dying. CAB International, Wallingford, UK,149-184. |
| [24] | Kyereh B, Swaine MD, Thompson J (1999). Effect of light on the germination of forest trees in Ghana. Journal of Ecology, 87,772-783. |
| [25] | Martin AC (1946). The comparative internal morphology of seeds. The American Midland Naturalist, 36,513-660. |
| [26] | McLaren KP, McDonald MA (2003). The effects of moisture and shade on seed germination and seedling survival in a tropical dry forest in Jamaica. Forest Ecology and Management, 183,61-75. |
| [27] | Paz H, Mazer SJ, Martinez-Ramos M (1999). Seed mass, seedling emergence, and environmental factors in seven rain forest Psychotria (Rubiaceae). Ecology, 80,1594-1606. |
| [28] | Popma J, Bongers F (1988). The effect of canopy gaps on growth and morphology of seedlings of rain-forest species. Oecologia, 75,625-632. |
| [29] | Saxena A, Singh DV, Joshi NL (1996). Autotoxic effects of pearl millet aqueous extracts on seed germination and seedling growth. Journal of Arid Environments, 33,255-260. |
| [30] | Schupp EW (1995). Seed-seedling conflicts, habitat choice, and patterns of plant recruitment. American Journal of Botany, 82,399-409. |
| [31] | Su WH (苏文华) (1997a). A preliminary study on the intraspecific and interspecific competitions of canopy populations in tropical rain forest in Xishuangbanna. Chinese Journal of Applied Ecology (应用生态学报), 8(Suppl.),50-54. (in Chinese with English abstract) |
| [32] | Su WH (苏文华) (1997b). A preliminary study on the dynamics of Pometia tomentosa population in the tropical seasonal rain forest of Xishuangbanna. Acta Botanica Yunnanica (云南植物研究), 4 (Suppl.),92-96. (in Chinese with English abstract) |
| [33] | Swaine MD, Lieberman D, Putz FE (1987). The dynamics of tree populations in tropical forest: a review. Journal of Tropical Ecology, 3,359-366. |
| [34] | Swaine MD, Whitmore TC (1988). On the definition of ecological species groups in tropical rain forests. Vegetatio, 75,81-86. |
| [35] | Tanner EVJ, Teo VK, Coomes DA, Midgley JJ (2005). Pair-wise competition-trials amongst seedlings of ten dipterocarp species: the role of initial height, growth rate and leaf attributes. Journal of Tropical Ecology, 21,317-328. |
| [36] | Vázquez-Yanes C, Orozco-Segovia A, Rincon E, Sanchez-Coronado ME, Huante P, Toledo JR, Barradas VL (1990). Light beneath the litter in a tropical forest effect on seed germination. Ecology, 71,1952-1958. |
| [37] | Walters MB, Reich PB (1996). Are shade tolerance, survival, and growth linked? Low light and nitrogen effects on hardwood seedlings. Ecology, 77,841-853. |
| [38] | Walters MB, Reich PB (2000). Seed size, nitrogen supply, and growth rate affect tree seedling survival in deep shade. Ecology, 81,1887-1901. |
| [39] | Webb EL (1999). Growth ecology of Carapa nicaraguensis Aublet. (Meliaceae): implications for natural forest management. Biotropica, 31,102-110. |
| [40] | Wen B (文彬), Yin SH (殷寿华), Lan QY (兰芹英), Yang XY (杨湘云) (2002). Ecological characteristics of seed germination of Pometia tomentosa. Guihaia (广西植物), 22,408-412. (in Chinese with English abstract) |
| [41] | Whitmore TC (1990). An Introduction to Tropical Rain Forest. Clarendon, Oxford. |
| [42] | Whitmore TC (1996). A review of some aspects of tropical rain forest seedling ecology with suggestions for further enquiry. In: Swaine MDed. The Ecology of Tropical Forest Tree Seedlings. The Parthenon Publishing Group, International Publishers in Science, Technology and Education, Paris,3-39. |
| [43] | Wu ZY (吴征镒) (1980). Vegetation of China (中国植被). Science Press, Beijing. (in Chinese) |
| [44] | Zhang YJ (张亚杰), Feng YL (冯玉龙), Feng ZL (冯志立), Cao KF (曹坤芳) (2003). Morphological and physiological acclimation to growth light intensities in Pometia tomentosa. Journal of Plant Physiology and Molecular Biology (植物生理与分子生物学学报), 29,206-214. (in Chinese with English abstract) |
| [45] | Zhang YP (张一平), Dou JX (窦军霞), Ma YX (马友鑫), Liu YH (刘玉洪), Guo P (郭萍) (2002). Characteristics of tridimensional distribution of microclimate in tropical seasonal rain forest canopy gap. Journal of Fujian College of Forestry (福建林学院学报), 22,42-46. (in Chinese with English abstract) |
| [46] | Zhu H (朱华), Wang H (王洪), Li BG (李保贵), Xu ZF (许再富) (1998). Research on the tropical seasonal rainforest of Xishuangbanna, South Yunnan. Guihaia (广西植物), 18,371-384. (in Chinese with English abstract) |
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