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Community Survey of Extrafloral Nectaried Plants in Tropical Rainforest in Xishuangbanna, Yunnan of China

Author: LiuJingXin
Tutor: ChenJin
School: Xishuangbanna Tropical Botanical Garden
Course: Ecology
Keywords: Xishuangbanna Extrafloral nectary plant Ant Communities on The level of herbivory Growth stages
CLC: Q948
Type: Master's thesis
Year: 2007
Downloads: 74
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Abstract


Extrafloral nectaries (Extrafloral nectary) is pointing born nectary the plants flower external organ (such as leaves, stems, calyx outside of petals outside) usually has nothing to do with pollination. Different plant communities, the extrafloral nectaries amount of plants in different plant groups, different life and different communities layer and the reasons have been scientific issues of concern to people. Xishuangbanna is located in tropical Southeast Asia extrafloral nectary plant on the region's research has not been reported to the transition zone of subtropical East Asia. Xishuangbanna Nature Reserve, the authors selected three pristine tropical rainforest and four different age secondary forest research, including: (1) the various communities extrafloral nectaries angiosperms investigation; (2) different communities of forest age between plants of different life forms, and the comparison between the different layers of the original forest communities extrafloral nectary plant species richness; nectary plant (stick handle spent three common woody flower (3) the pristine rainforest different growth stages on Cleidion bracteosum, of rat poisoning sub Dichapetalum gelonioides Pometia longan Pometia tomentosa) suffered herbivory injury situation and extrafloral nectaries quantity changes. This research was supported by the following results: (1) survey of 424 kinds of angiosperms, 52 species (12.3%, this low level of richness in tropical communities) belongs extrafloral nectary plant, of which there are 37 kinds ( 71.2%), and 8 (22.2%) is reported for the first time. The analysis showed that most of extrafloral nectary plant belonging to the Dillenia subclass (Dillenidae) rose subclasses (Rosidae) and Ju subclass (Asteridae); most common flat extrafloral nectary blade is spent outside honey parts of the gland with students. (2) nectary plant flowers in the seven communities variety to the Vatica pristine forests lowest (9.8%), 5-year-old Zhongping woods (18.5%), than the native forest, secondary forest extrafloral nectary plant richer. (3) plants of different life forms, the extrafloral nectaries plant species richness in turn trees gt; shrubs gt; Fujimoto gt; herb, found no epiphytes and parasitic plants have extrafloral nectary, we think that the different life forms in extrafloral nectary plant species richness differences may be caused by differences of the different groups of plants. (4) three of the original rain forest from the trees layer nectary plant richness in the shrub layer flower in descending order of arbor layer (30.1 ± 15.6%), tree three (17.4 ± 3.3%), the arbor the second floor (12.8 ± 1.4%), shrub layer (9.7 ± 5.2%), the result is similar in Malaysia, a community survey results, but the results of analysis of variance between the different layers can not prove significant differences (F3, 11 = 1.041, P = 0.425). (5) three kinds of flowers outside nectary plant a common feature of development with the growth process the suffer herbivory degree of change is no difference between the saplings and small trees in two stages, but the small trees and seedlings stage vary. The rod handle flower (Cleidion bracteosum), the fluff Pometia (Pometia tomentosa) are small trees stages herbivory levels higher than the seedling stage the level of herbivory the rat poisoning sub (Dichapetalum gelonioides) is the low level of small trees stages herbivory herbivory levels in the seedling stage. (6) Three extrafloral nectary plant with the growth process of the development of its average nectary of each blade on the quantity and unit leaf area nectary number of common characteristics is no difference between the saplings and small trees in two stages, seedlings there are differences between the two phases of and saplings; the nectaries number of small tree stage and seedling stage on the average single blade stick handle flower (C. bracteosum) no difference the rat poisoning sub of (D. gelonioides) and P. tomentosa (P. tomentosa) vary. The nectary quantity per unit leaf area on the small tree stage and seedling segment rat poisoning sub (D. gelonioides) No difference the rod handle flower the (C. bracteosum) and P. tomentosa (P. tomentosa) have differences. (7) found that the ants 13 genera and 35 species of about 122. Spend the rod handle 9 and 9 species gt; 25 heads, the rat poisoning sub 6 7 species gt; 19 head, 11 P. tomentosa 21 species gt; 75 heads. Above, the tropical rainforest rich extrafloral nectary plant, but the visiting ant communities rich. Secondary forest of extrafloral nectaries plant species richness in higher than that of the native forest. Different life forms of plants, flowers outside the the nectaries plant species richness is different, and may be caused by differences due to the different plant taxa richness. The original rainforest in the different layers of plant extrafloral nectary plant species richness differences may be due to the result of the interaction of light environment and herbivory pressure. Different plants at different growth stages, the extrafloral nectary changes and herbivory vary, the the extrafloral nectary number of differences in the different growth stages, and may not fully reflect the the plant facing herbivory pressure.

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CLC: > Biological Sciences > Botany > Plant ecology and biogeography
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