黃腐酸是腐植酸中具有活力的組成部分,其分子量較小、易溶于水、抗絮凝性能好、活性官能團(tuán)多,化學(xué)活性和生物活性很高,在農(nóng)業(yè)上應(yīng)用廣泛,有較好效果。黃腐酸可以提氮、解磷、促鉀,有利于提高肥料利用率,有助于促進(jìn)土壤團(tuán)聚體形成,改善土壤理化性質(zhì)。目前關(guān)于黃腐酸的研究多集中于黃腐酸對(duì)土壤肥力的影響,而黃腐酸對(duì)土壤障礙因子的消減機(jī)制及其異源黃腐酸在土壤中的環(huán)境效應(yīng)還不明確。因此,本研究利用盆栽試驗(yàn),研究不同來源（植物源固體[S]、自然源液體[NL]、植物源固體[P]）及不同用量（0,0.25%,0.5%）的黃腐酸對(duì)不同類型土壤（白漿土、灌漠土及沙姜黑土）有機(jī)碳組分、養(yǎng)分含量及團(tuán)聚體穩(wěn)定性的影響,并在此基礎(chǔ)上分析了黃腐酸用量對(duì)小麥和玉米生長特性的影響,為明確黃腐酸對(duì)土壤障礙因子消減的機(jī)制提供參考。本研究主要取得如下結(jié)果:（1）不同來源黃腐酸影響沙姜黑土養(yǎng)分含量。施用黃腐酸顯著提升沙姜黑土養(yǎng)分含量,但不同來源黃腐酸的提升效果存在差異。相比對(duì)照處理,NL和P黃腐酸顯著提升沙姜黑土的有機(jī)質(zhì)含量,而S黃腐酸效果不顯著。不同來源黃腐酸對(duì)沙姜黑土有機(jī)碳組分（輕組有機(jī)碳和重組有機(jī)碳）的影響不顯著,但卻顯著降低土壤的... 

【文章頁數(shù)】：94 頁

【學(xué)位級(jí)別】：博士

【文章目錄】：
摘要
abstract
Abbreviations
Chapter 1 Introduction
    1.1 Cultivated land in China
    1.2 Humic substances and its source
        1.2.1 Role of humic acid and its mechanism
        1.2.2 Formation of fulvic acid
        1.2.3 Humates
    1.3 Influence of humic and fulvic acids on physical properties of soil
    1.4 Influence of humic and fulvic acids on chemical properties of soil
    1.5 Influence of HA/FA on soil fertility
    1.6 Plant response to humic and fulvic acids
    1.7 Research aim and purpose
    1.8 Research questions
    1.9 Objectives
Chapter 2 Material and methods
    2.1 Experimental soils
    2.2 Basic soil properties
    2.3 Experimental design
    2.4 Analytical methods
        2.4.1 Electrical conductivity and p H
        2.4.2 Soil organic matter
        2.4.3 Available nitrogen
        2.4.4 Available phosphorus
        2.4.5 Available potassium
        2.4.6 Exchangeable calcium and magnesium in soil
        2.4.7 Organic-inorganic compound and organic-inorganic composites analysis
        2.4.8 Plant height
        2.4.9 Stem diameter
        2.4.10 Plant biomass
        2.4.11 Total nitrogen content
        2.4.12 Phosphorus content
        2.4.13 Potassium content
        2.4.14 Water stable aggregates
    2.5 Statistical analysis
Chapter 3 Effect of fulvic acids derived from different materials on changing properties of albic black soil in the northeast plain of China
    3.1 Introduction
    3.2 Results
        3.2.1 Effect of fulvic acids on soil organic carbon and its labile fractions
        3.2.2 Effect of fulvic acids on soil chemical properties
        3.2.3 Effect of fulvic acids on soil exchangeable calcium and magnesium,organic–inorganic compound,and organic–inorganic complexes
    3.3 Discussion
        3.3.1 Effect of fulvic acid on soil organic carbon and organic–inorganic compounds
        3.3.2 Effect of fulvic acids on soil fertility
    3.4 Conclusion
Chapter 4 Effect of plant-derived fulvic acid material on the properties of albic,irrigated desert and shahjiang black soils collected from different regions of China
    4.1 Introduction
    4.2 Results
        4.2.1 Influence of PDL FA on soil organic carbon,and its labile fractions
        4.2.2 Influence of PDL FA on electrical conductivity and p H
        4.2.3 Influence of PDL FA on available and total nutrients of three soils
        4.2.4 Exchangeable calcium,magnesium,organic-inorganic degree compounds,and organic-inorganic composites
    4.3 Discussion
    4.4 Conclusion
Chapter 5 Influence of fulvic acids derived from different materials on the physiological characteristics,plant growth and nutrient uptake during maize-wheat production
    5.1 Introduction
    5.2 Results
        5.2.1 Influence of FA on maize diameter and wheat spike weight
        5.2.2 Influence of FA on plant height and biomass content of maize-wheat
        5.2.3 Influence of FA on the thousand-grain weight of maize-wheat
        5.2.4 Influence of FA on nutrients contents of maize
        5.2.5 Influence of FA on nutrients contents of wheat
    5.3 Discussion
        5.3.1 Influence of FA on plant growth characteristics of maize-wheat
        5.3.2 Influence of FA on nutrient contents of maize-wheat
    5.4 Conclusion
Chapter 6 Effect of organic substances and manures on soil aggregates and aggregate-associated carbon and nitrogen content of different regions soils of China
    6.1 Introduction
    6.2 Results
        6.2.1 Mean weight diameter and aggregates size distribution
2 mm macro-aggregates fraction">        6.2.2 Distribution of soil organic carbon and total nitrogen in>2 mm macro-aggregates fraction
        6.2.3 Distribution of soil organic carbon and total nitrogen in2-0.25 mm aggregates fraction
        6.2.4 Distribution of soil organic carbon and total nitrogen in0.25-0.053 mm micro-aggregate fraction
        6.2.5 Distribution of soil organic carbon and total nitrogen in silt and clay fractions
    6.3 Discussion
        6.3.1 Aggregate stability
        6.3.2 Distribution of carbon and nitrogen associated with aggregates
    6.4 Conclusion
Chapter 7 Conclusion
References
Acknowledgement
Author's Biography


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期刊論文
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