土壤動物在土壤的形成、維持生態(tài)系統(tǒng)功能等方面起著重要的作用,受到施肥等人類活動的影響。然而,人們關于施肥對土壤動物群落的具體影響仍然缺乏深刻的認識。關于棲息地的變化和食物資源的改變對調(diào)控土壤動物對施肥響應的相對貢獻的爭論仍在繼續(xù)。因此,本人通過野外實驗探討了N肥添加對土壤動物群落的影響及其主導調(diào)控因素,并且通過meta分析來探索土壤動物群落在全球尺度上對施肥的響應及其調(diào)控因素。在第一項研究中（野外實驗,第二章）,本人在中國東部楊樹人工林（Populus deltoids）中,通過模擬N沉降(0,50,100,150以及300 kg N ha^-1 year^-1)實驗,探討了總的土壤動物以及植食性土壤動物群落在不同土層（0-10,10-25和25-40 cm）對N添加的響應。我們將不同施N水平所需的NH₄NO₃溶解于水中,采用背負式噴霧器將其均勻灑入樣地來模擬N沉降。我們的結果表明:低濃度的N添加顯著增加了總土壤動物和植食性土壤動物密度(D_total和D_p),高...

【文章頁數(shù)】：76 頁

【學位級別】：碩士

【文章目錄】：
Acknowledgements
摘要
abstract
Chapter1 Introduction
    1.1 Function of soil fauna in ecosystems
    1.2 Effects of fertilization on soil fauna community
Chapter2 Fine Root Biomass Mediates Soil Fauna Community in Response to N Addition in Poplar Plantations(Populus deltoids)on the East Coast of China
    2.1 Introduction
    2.2 Materials and Methods
        2.2.1 The Experimental Site and Design
        2.2.2 Microclimate
        2.2.3 Measurement of C and N in Litter and Soil Samples
        2.2.4 Estimation of Fine Root Biomass
        2.2.5 Soil Fauna Sampling and Identification
        2.2.6 Statistical Analysis
    2.3 Results
        2.3.1 Microclimate,Litter C and N,Soil Samples,and Fine Root Biomass
        2.3.2 Soil Fauna Community as Affected by N Addition
        2.3.3 Fine Root Biomass Regulation of Soil Fauna Density
    2.4.Discussion
        2.4.1 N-addition Impacts on Soil Fauna Density
        2.4.2 N-addition Impacts on the Number of Groups and Diversity of Soil Fauna
        2.4.3 Increasing N-Addition Thresholds along Soil Profile
        2.4.4 Regulation of Fine Root Biomass on Soil Fauna
Chapter3 Effects of fertilization on soil fauna community:a meta-analysis
    3.1 Introduction
    3.2 Methods
        3.2.1 Data collection
        3.2.2 Data analysis
    3.3 Results
        3.3.1 The average effects of fertilization on soil and microbial attributes
        3.3.2 The variation of fertilization effects on soil fauna abundance
        3.3.3 Influence of fertilizer types on soil fauna abundance among ecosystem types
        3.3.4 Influence of fertilizer types on soil fauna abundance among climate zones
        3.3.5 Influence of fertilization on the group number and diversity of soil fauna community
        3.3.6 Measuring correlations of soil fauna community with soil and microbial characteristics
    3.4 Discussion
        3.4.1 Overall effect of fertilization on soil fauna abundance
        3.4.2 Overall effect of fertilization on group number and diversity of soil fauna
        3.4.3 Influence of experimental and geographic factors on soil fauna abundance
        3.4.4 Regulation of microbe on soil fauna
Chapter4 Conclusions and Future Perspectives
    4.1 Conclusions
    4.2 Future perspectives
Publications
References



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