黄腐酸对三种典型障碍土壤特性和作物生长的改良

发布时间：2022-12-11 16:55

　　黄腐酸是腐植酸中具有活力的组成部分,其分子量较小、易溶于水、抗絮凝性能好、活性官能团多,化学活性和生物活性很高,在农业上应用广泛,有较好效果。黄腐酸可以提氮、解磷、促钾,有利于提高肥料利用率,有助于促进土壤团聚体形成,改善土壤理化性质。目前关于黄腐酸的研究多集中于黄腐酸对土壤肥力的影响,而黄腐酸对土壤障碍因子的消减机制及其异源黄腐酸在土壤中的环境效应还不明确。因此,本研究利用盆栽试验,研究不同来源（植物源固体[S]、自然源液体[NL]、植物源固体[P]）及不同用量（0,0.25%,0.5%）的黄腐酸对不同类型土壤（白浆土、灌漠土及沙姜黑土）有机碳组分、养分含量及团聚体稳定性的影响,并在此基础上分析了黄腐酸用量对小麦和玉米生长特性的影响,为明确黄腐酸对土壤障碍因子消减的机制提供参考。本研究主要取得如下结果:（1）不同来源黄腐酸影响沙姜黑土养分含量。施用黄腐酸显著提升沙姜黑土养分含量,但不同来源黄腐酸的提升效果存在差异。相比对照处理,NL和P黄腐酸显著提升沙姜黑土的有机质含量,而S黄腐酸效果不显著。不同来源黄腐酸对沙姜黑土有机碳组分（轻组有机碳和重组有机碳）的影响不显著,但却显著降低土壤的... 

【文章页数】：94 页

【学位级别】：博士

【文章目录】：
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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