目录
摘 要 I
ABSTRACT II
第一章 文献综述 1
1 研究背景与意义 1
2 土壤有机碳及团聚体稳定机制 2
2.1 土壤有机碳及其稳定机制 2
2.2 团聚体的形成及其固碳机制 2
2.3 微生物残体碳 3
2.4 生物质炭对土壤固碳潜力的影响 4
3 研究目的与意义 5
第二章 生物质炭施用对水稻土团聚体组成及微生物残体碳的影响 6
1 材料与方法 6
1.1试验地概况 6
1.2 测定指标与方法 6
1.3 数据处理与分析 7
2 结果与分析 8
2.1 团聚体分布及稳定性 8
2.2 团聚体有机碳分布及来源 8
2.3 团聚体间氨基糖及氨基糖源有机碳的分布 9
3 讨论 12
3.1 生物质炭对团聚体及有机碳分布的影响 12
3.2 生物质炭对土壤微生物残体碳分布的影响 14
第三章 结论与展望 15
1 结论 15
2 展望 16
参考文献 17
致 谢 19
生物质炭施用对水稻土团聚体组成及微生物残体碳的影响
摘 要
团聚体对有机碳的物理保护是土壤固碳减排的重要机制之一，生物质炭添加对团聚体中碳保蓄与周转的影响的相关研究近年来逐渐升温。本研究以太湖地区水稻土为试验对象，设置未施碳与施碳两组处理，采用湿筛法对团聚体进行分组，重点探究生物质炭的添加对土壤中团聚体的分布及其中有机碳赋存的影响。包括：（1）生物质炭的施用对团聚体分布及稳定性的影响；（2）施碳对土壤原始有机碳周转的影响及新碳在各粒组团聚体中的赋存情况；（3）施碳对以氨基糖为主的微生物残体碳在团聚体中分布和周转的影响。研究结果表明：生物质炭的添加显著提高了土壤团聚体的稳定性，并促进了小团聚体向大团聚体的转变；两种处理均表现出微团聚体中的有机碳含量最高，且对外源添加物的响应最为灵敏。大颗粒生物质炭充当核心吸附大量细小颗粒，其高抗分解性使得生成的新团聚体稳 *51今日免费论文网|www.51jrft.com +Q: ^351916072# 
定性优于原土；同时，生物质炭阻碍了土壤微生物的生命活动，微生物不得不同化以氨基糖为主的土壤多糖以供给自身存活，导致施碳后团聚体中的氨基糖水平都呈现出显著下降。
关键词 生物质炭；土壤团聚体；固碳减排；氨基糖
EFFECTS OF BIOCHAR APPLICATION ON
AGGREGATE COMPOSITION AND MICROBIAL RESIDUE CARBON IN PADDY SOIL
ABSTRACT
The physical protection of aggregates on organic carbon is one of the most important mechanisms of soil carbon sequestration and emission reduction, and the research on the effect of biochar addition on carbon storage and turnover in aggregates has been warming up in recent years. In this study, the aggregates of paddy soil in Tai Lake were divided into two groups by wetsieving method, the effects of biochar addition on the distribution of soil aggregates and organic carbon storage were investigated. The results include: (1) The effect of carbon application on the distribution and stability of aggregates; (2) The effect of carbon application on the turnover of soil original organic carbon and the distribution of new carbon in aggregates; (3) The effect of carbon application on the distribution and turnover of amino sugar based microbial residue carbon in aggregates. The results showed that the addition of biochar significantly increases the stability of soil aggregates and promoted the transition from small to large aggregates, and both treatments showed the highest content of organic carbon in microaggregates, and the response to exogenous additives is the most sensitive. As the core of the biochar, it adsorbs a large number of small particles, and its high resistance to decomposition makes the stability of the resulting new aggregates better than that of the original soil, the microorganisms have to assimilate the soil polysaccharide which is mainly amino sugar to survive, which leads to the significant decrease of the amino sugar level in the aggregates after biochar application.

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