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A Study on the Population Ecology of Camellia Pingguoensis var. Terminalis

Author: DaiYue
Tutor: XueYueGui
School: Guangxi Normal University
Course: Ecology
Keywords: Ting-sheng golden camellia Populations Age structure Distribution pattern Branching pattern Reproductive modulars
CLC: S685.14
Type: Master's thesis
Year: 2006
Downloads: 182
Quote: 2
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Abstract

Ting-sheng golden camellia (Camellia pingguoensis var. Terminalis) is a specific rare plants in Guangxi limestone mountain evergreen monsoon forest. Currently only the distribution of communities in an area of ??approximately 2.38hm2, it is only 1729, and has endangered in Tiandeng County south and southwest of a narrow range within a confined area. This paper uses a variety of statistical analysis methods of plant taxonomy and ecology, distribution and habitat characteristics of the population biology and community characteristics, population structure and dynamic, constructive population characteristics were studied, the results are as follows: ⑴ the top students the golden camellia population is mainly dependent on clams, wood and stone mountain Zhanglin (P1), the Zenia clams lumber (P2), flowers of Lee Lam Shishan Nan Lin (P3) the toothed leaves Hydnocarpus closed flowers forest (P4) community environment constitutes shrubs the dominant species in the layer, or a total of good seed. Various communities, flowers Lee Lam Shi Shannan communities layers of richness and diversity of the overall highest habitat is the most advantageous. Was cut the most serious the Zenia clams wood Species diversity is highest in the shrub layer, the lowest tree layer. Highest uniformity of distribution of the highest elevation serrata Hydnocarpus closed the Cercidifolius shrubs and herbaceous layer. Bare rock is the most abundant of the clams tree layer of wood and stone mountain Zhanglin lowest evenness. Species richness in the community vertical levels: the shrub layer gt; the tree layer gt; herb layer, species diversity the Corbicula wood and stone Mountain Zhanglin and the performance of any bean clams lumber for: shrub layer gt; herbaceous layer gt; tree layer. Sticks flower Lee Lam Danshan Nan Lin and toothed leaves Hydnocarpus, closed flowers forest: the tree layer gt; herbaceous layer gt; shrub layer. The species evenness performance: tree layer gt; herbaceous layer gt; shrub layer. Camellia chrysantha ⑵ top students population of highly distributed mainly between 0.5 ~ 3m. Adult plant basal diameter distribution mainly between 1.5 ~ 5cm, the investigation of individual maximum base diameter of 13.85cm. The Institute is divided seven diameter classes: Ⅰ, Ⅱ grade seedlings, saplings, basal diameter of 1.5 ~ 5cm Ⅲ, Ⅳ, Ⅴ mature trees, basal diameter greater than 5cm VI the Ⅶ level for older strains. The age of the top students Yellow Camellia four populations from small to large order of P2 lt; P1 lt; P4 lt; P3. Top-born golden camellia populations P1 clams, wood and stone, Zhang Shan community stable for a stable transition to the recession-P2 Zenia clams wood communities. In the branch spent Lee Lam Dan Shannan community for stable growth in Cercidifolius in serrata Hydnocarpus closed. The cubic curve regression equation is more suitable than the traditional power of the regression equation prediction model used as a top-born golden camellia population trends. Camellia chrysantha populations ⑶ top students in 9m2, 16 m2 and 25 m2, 36 m2 and 100 m2 different sampling showed significant cluster distribution, to 9 m2 scale cluster strength. Population in each community cluster strength from largest to smallest: P2 gt; P3 gt; P1 gt; P4. Performance distribution pattern of populations of different developmental stages: I, II grade seedlings and saplings gathered strength; decline in stage III age individuals gathered strength; Ⅳ grade and above, the aging plants tends to be uniform or random distribution. Grade Ⅳ individuals affected by the environmental resistance. ⑷ the golden camellia crown Ting-sheng configuration and branching pattern: age, in different growth canopy configuration significantly different. Seedlings, saplings stages of plant height growth generally faster, crown slower growth. Stage into a tree, plant height growth slowing Ⅶ level old strains also bald tip; rapid expansion crown. The the top raw golden camellia plants at the base average trunk number of individuals chopped rate was significantly associated with the the level individual chopped Ⅳ rate highest average trunk corresponding peak. There are some differences in the different communities, canopy configuration. Camellia chrysantha top students spent in comprehensive environmental conditions optimal branches Lee Lam Shi Shannan community indicators branching intensity tall plant type, high growth. In the high altitude the high shade serrata Hydnocarpus of closed flowers communities, crown carry rather partial short plants, crown width growth. In high temperatures, low rainfall, the rocky outcrop highest rate of clams wood and stone mountain camphor community, the smaller component indicators, a lower level of growth components. The felling of interference is the most serious shade lowest Zenia clams wood community the lowest component indicators, plant type dwarf, emaciated branches at all levels-intensive compact. Its average branching angle of more than about 30 °, and 50 ° in other communities. The top students Camellia branching series is typically 5 to 9. P3 populations sticks series (9) of the highest representatives of the analysis show that: there are some differences in the different branch level, branching pattern. 1 to 3 points ulterior motives in long fast growth, mainly vegetative branches, about 0.5cm above. Branching differentiation for breeding more than three branches. 1 to 9 from largest to smallest generally vary between 50 ° ~ 30 ° branching angle. 1,2,3 grade primary branches of the total average number of branches was significantly higher than the level 6,7,8 senior sticks. ⑸ reproductive component of the study show that: Ting-sheng Camellia flowering from September to December, the fruit of 12 to May the following year, not every year fruition. Flowering in the low-altitude, low shade than the opposite conditions to early but flowering of less, the average life of the flowers is also short. The top students Camellia reproductive branches allocated in the canopy upper, sunny side and base diameter range of 1.5 ~ 10cm twigs a basal diameter range 2.5 ~ 5cm shoots the highest proportion. The most frequently was cut a twig base diameter range of 2.5 ~ 5cm, logging its pernicious effects of the number and distribution of individual reproductive components with significant. Ting-sheng in Ⅲ ~ Ⅶ level has golden camellia blossom phenomenon. Fruit quantity and flowering abortion rate increases with the diameter of the growth; rate of fruit set and fruit period abortion rate decreased with the diameter of the growth. Flowering abortion rates were as high as 58% or more, the fruit quantity flowering the difference between the amount of very significant. Each size class fruit period lost fertility rate in Zenia clams wood communities and sticks of flowers Lee Lam Shi Shannan community for about 40 to 60%, about 20 to 30% in clams, wood and stone, Zhang Shan community and serrata windy sub-closed flowers communities. The low seed set, spend more fruit \Speculated that the low pollination efficiency reasons, in addition to lack of nutrition supply wildlife interference has an important influence. The ecological adaptation strategies showed overall growth and reproduction of the top Health Camellia K countermeasures. Ting-sheng Camellia reproductive modulars up the branch spent Lee Lam Dan Shannan communities, but its flowers, the fruit of the abortion rate is higher, lower reproductive efficiency. Zenia the clams wooden communities with the highest rate of flowering and reproductive investment value, at least, its flowers, the fruit of the highest abortion rate, the lowest reproductive efficiency. Clams wood and stone mountain camphor community center, but the flowers, the fruit of abortion rate relative minimum, reproductive highest efficiency. Less, in the the toothed leaf windy sub closed Cercidifolius period of fruit abortion rate and low reproductive efficiency. ⑹ the golden camellia Ting-sheng population suitable for growing in the shade degrees 60 to 90% of the typical evergreen monsoon rain forest community structure is more stable, stand humidity layer obviously. The main limiting factor is the growth of light and human disturbance. ⑺ top students Camellia endangered mainly due to: direct human interference and the resulting habitat fragmentation, Ting-sheng golden camellia breeding characteristics and special habitats.

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