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松嫩草地地下净生产力和细根动态对不同的管理实践的响应

摘要第4-7页
Abstract第7-9页
Chapter 1: General introduction第13-28页
    1.1 Background and problems第13-15页
    1.2 State of the art第15-26页
        1.2.1 Root definition and functions第16-17页
        1.2.2 The Growth, Lifespan, and Death of Root第17-18页
        1.2.3 Factors influencing belowground production第18-21页
        1.2.4 Methods in root research第21-25页
        1.2.5 Land use practices and grassland restoration第25-26页
    1.3 Objectives and skeleton diagram of the thesis第26-28页
Chapter 2: Materials and methods第28-46页
    2.1 Experimental sites第28-34页
        2.1.1 General description第28-30页
        2.1.2 Study site第30-34页
    2.2 Methods第34-44页
        2.2.1 Plant samples collection第34-41页
        2.2.2 Soil sample determination第41-44页
    2.3 Data analysis第44-46页
Chapter 3: The combination of litter amount and seeding accelerates the restoration ofbelowground net primary production in degraded Songnen grassland第46-59页
    3.1 Introduction第46-47页
    3.2 Results第47-54页
        3.2.1 Weather variability第47-48页
        3.2.2 Soil moisture content第48-50页
        3.2.3 ANPP, BNPP and NPP第50-52页
        3.2.4 Root fraction (f_(BNPP))第52-53页
        3.2.5 Correlation comparison第53-54页
    3.3 Discussion第54-58页
        3.3.1 Effects of litter and seeding on soil moisture content第54-55页
        3.3.2 The effects of litter and seeding on ANPP and BNPP第55-57页
        3.3.3 Effects of litter and seeding on root fraction第57-58页
    3.4 Conclusion第58-59页
Chapter 4: Tillage and clipping aboveground litter practices increased belowground netprimary productivity and root fraction in Songnen grassland第59-74页
    4.1 Introduction第59-60页
    4.2 Results第60-68页
        4.2.1 Soil moisture content (SMC)第60-62页
        4.2.2 Aboveground net primary production (ANPP) and net primary production (NPP)第62-64页
        4.2.3. Belowground net primary production (BNPP) and root fraction (f_(BNPP))第64-65页
        4.2.4 Soil organic matter (SOM)第65-66页
        4.2.5. Correlation comparisons第66-68页
    4.3 Discussion第68-73页
        4.3.1 Soil moisture and management practices第68-69页
        4.3.2 ANPP and management practices第69-70页
        4.3.3 BNPP and management practices第70-71页
        4.3.4 Root fraction (f_(BNPP)) and management practices第71-72页
        4.3.5 Soil organic matter (SOM) and management第72-73页
    4.4 Conclusion第73-74页
Chapter 5:Clipping aboveground litter lead to enhance fine root production, mortality,turnover and fine root lifespan along artificial and natural management of degradedSongnen grassland第74-89页
    5.1 Introduction第74-76页
    5.2 Results第76-84页
        5.2.1 Seasonal dynamics of fine root production, mortality and standing crop第76-77页
        5.2.2 Belowground net primary production (BNPP)第77-78页
        5.2.3 Root productivity, mortality, and mean standing crop第78-80页
        5.2.4 Annual root turnover第80-81页
        5.2.5 Correlation between soil moisture and root production, mortality, turnover第81-82页
        5.2.6 Response of root lifespan of different soil profiles to land-use management第82-84页
    5.3 Discussion第84-88页
        5.3.1 Seasonal dynamics of root productivity, root mortality and standing crop第84-85页
        5.3.2 Fine root production, mortality and standing crop第85-86页
        5.3.3 Fine root turnover and lifespan第86-88页
    5.4 Conclusion第88-89页
Chapter 6: Relationship between species distribution patterns and soil salinity in Songnen grassland第89-98页
    6.1 Introduction第89-90页
    6.2 Results第90-94页
        6.2.1 Soil pH, EC, Soil N and SOM第90-91页
        6.2.2 Aboveground biomass and relative biomass第91-92页
        6.2.3 Correlation comparisons第92-94页
    6.3 Discussion第94-97页
        6.3.1 Patch Size and Genesis第94-95页
        6.3.2 Relationship between Species Distribution Patterns and Soil Salinity第95-97页
    6.4 Conclusion第97-98页
Summary and conclusions第98-103页
总结和结论第103-107页
References第107-122页
Acknowledgement第122-123页
Dedication第123-124页
Papers published and under process第124页

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