森林系統(tǒng)的自然再生對維持森林的物理和生物結(jié)構(gòu)提供了一個關(guān)鍵的機制,對保護森林物種多樣性和提供生態(tài)系統(tǒng)服務(wù)具有重要的價值。然而,人們對這一森林自然更新過程及其在群落構(gòu)建和動態(tài)中所起的關(guān)鍵作用仍缺乏了解。本論文選擇了位于中國廣西亞熱帶森林帶上的岑王老山、花坪、木倫及大瑤山的山地或喀斯特常綠落葉闊葉混交林為研究對象,重點關(guān)注種子的產(chǎn)出(即種子雨)、土壤種子庫和種子萌發(fā)形成的幼苗庫之間相互聯(lián)系的自然更新過程,探明生物和非生物因素對種群成功更新的影響,從而增加我們對最終塑造森林生態(tài)系統(tǒng)的早期植物個體發(fā)生階段的生態(tài)過程的了解。(1)大量結(jié)實指年際間的和同步的高種子生產(chǎn)的繁殖事件,是一種在許多植物種中都得到進化的廣泛分布的繁殖策略。第一部分的野外連續(xù)觀測研究分析了中華楓(Acer campbellii subs.sinense)的大量結(jié)實事件及其對種群增長的影響。結(jié)果表明中華楓的種子并不持續(xù)存在于土壤種子庫中(溫室種子萌發(fā)實驗中發(fā)現(xiàn)種子數(shù)為0),其幼苗死亡率很高,93%的新增個體存活期不超過一年。幼苗的成活率主要受到個體大小的影響,較高幼苗和葉片數(shù)量較多的個體存活率更大;其次受到幼苗所處的微生境(例如...

【文章頁數(shù)】：119 頁

【學(xué)位級別】：博士

【文章目錄】：
摘要
ABSTRACT
CHAPTER1:General introduction
    1.1 INTRODUCTION
        1.1.1 Seed rain and soil seed bank
        1.1.2 Forest seedling influence on vegetation dynamics
        1.1.3 Biotic factors:plant-plant competition
        1.1.4 Biotic factors:plant-animal interactions
        1.1.5 Abiotic factors:interactions with the local environment
    1.2 SIGNIFICANCE
    1.3 THESIS STRUCTURE
CHAPTER2:Study sites,methods summary,and general description of seedling banks
    2.1 STUDY SITES
    2.2 METHODS
    2.3 SEEDLING BANKS
    2.4 SEED RAIN
CHAPTER3:Intrinsic biotic factors and microsite conditions drive seedling survival in a species with masting reproduction
    3.1 ABSTRACT
    3.2 INTRODUCTION
    3.3 MATERIALS AND METHODS
        3.3.1 Study area
        3.3.2 Data collection
        3.3.3 Statistical analyses
    3.4 RESULTS
    3.5 DISCUSSION
    3.6 CONCLUSIONS
CHAPTER4:Seedling growth and survival responses to multiple soil properties in subtropical forests
    4.1 ABSTRACT
    4.2 INTRODUCTION
    4.3 METHODS
        4.3.1 Statistical analyses
    4.4 RESULTS
        4.4.1 Abiotic characterization of forest sites
        4.4.2 Growth rate
        4.4.3 Survival
    4.5 DISCUSSION
    4.6 CONCLUSIONS
CHAPTER5:Abiotic resources indirectly shape herbivory by mediating plant apparency in seedling communities of four subtropical forests
    5.1 ABSTRACT
    5.2 INTRODUCTION
    5.3 METHODS
        5.3.1 Study areas and design
        5.3.2 Data collection
        5.3.3 Statistical analyses
    5.4 RESULTS
        5.4.1 Magnitude of leaf herbivory across sites
        5.4.2 Effects of biotic factors on leaf herbivory
        5.4.3 Effects of abiotic factors on leaf herbivory
    5.5 DISCUSSION
        5.5.1 Effects of biotic factors on leaf herbivory
        5.5.2 Effects of abiotic factors on leaf herbivory
        5.5.3 Limitations
    5.6 CONCLUSIONS
CHAPTER6:Synthesis and conclusions
    6.1 THESIS SYNTHESIS
        6.1.1 Chapter3:Seedling survival after mast seeding
        6.1.2 Chapter4:Seedling growth and survival responses to multiple soil nutrients
        6.1.3 Chapter5:Drivers of seedling herbivory
    6.2 FINAL CONCLUSIONS
REFERENCES
APPENDICES
ACKNOWLDGEMENTS
CURRICULUM VITAE



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