| 不同改良剂对酸性紫色土团聚体和有机碳的影响 |
| 摘要点击 3894 全文点击 685 投稿时间：2023-03-28 修订日期：2023-04-28 |
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| 中文关键词 改良剂 紫色土 土壤酸化 土壤团聚体 土壤有机碳 |
| 英文关键词 modifier purple soil soil acidification soil aggregate soil organic carbon |
| DOI 10.13227/j.hjkx.20240234 |
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| 中文摘要 |
| 研究不同改良剂对酸性紫色土团聚体和有机碳变化特征的影响，为酸性紫色土修复提供科学依据.以紫色土为研究对象，设置不施肥（CK）、单施化肥（F）、化肥配施石灰（SF）、化肥配施有机肥（OM）、化肥配施生物炭（BF）和化肥配施酒糟灰渣（JZ）共6个处理.比较不同改良剂施用下酸性紫色土的团聚体组成情况，以及各粒级团聚体有机碳分布规律，结合团聚体稳定性指标，明确不同改良剂对酸化紫色土团聚体结构的影响.结果表明，施肥处理均显著提高土壤pH，以JZ处理效果最显著，施肥均显著提高土壤有机质含量，以OM处理效果最好，BF和OM处理显著降低土壤容重，同时SF和BF处理显著提高土壤含水率（P < 0.05）；各处理均以 < 0.25 mm粒级团聚体为优势粒级，施肥能显著提高大团聚体（直径 > 0.25 mm的团聚状结构单位）的含量，同时施肥处理均显著提高了土壤几何平均直径（GMD）、平均重量直径（MWD）和R0.25值（> 0.25 mm团聚体含量），降低分形维数（D）和团聚体破坏率（PAD）值（P < 0.05），促进了土壤团聚体的团聚化和稳定性，以OM处理效果最好；与CK处理相比，施肥能显著提高土壤有机碳含量31.71%~209.67%，其中以OM处理最显著；不同处理土壤有机碳主要分布在大团聚体中，与CK处理相比，各处理显著提高大团聚体中有机碳贡献率为19.34%~47.76%，其中OM处理效果最为显著（P < 0.05）.综合来看，化肥配施有机肥能促进酸性紫色土大团聚体的形成，提高土壤团聚体稳定性，增加土壤有机碳含量，是改善酸性紫色土土壤结构和提升土壤质量的有效措施. |
| 英文摘要 |
| The aim of this study was to examine the effects of different modifiers on the changes in aggregates and organic carbon in acidic purple soil， providing a scientific basis for the remediation of acidic purple soil. Using purple soil as the research object， a total of six treatments were set up， including no fertilization （CK）， single fertilization （F）， fertilization with lime （SF）， fertilization with organic fertilizer （OM）， fertilization with biochar （BF）， and fertilization with distiller's grains ash （JZ）. We compared the composition of aggregates in acidic purple soil under the application of different modifiers， as well as the distribution pattern of organic carbon in aggregates of different particle sizes. Combined with the stability indicators of aggregates， we sought to clarify the impact of different modifiers on the structure of aggregates in acidic purple soil. The results showed that fertilization significantly increased the soil pH， with the JZ treatment being the most effective. Fertilization significantly increased soil organic matter content， with the OM treatment showing the largest increase. The BF and OM treatments significantly reduced soil bulk density， whereas the SF and BF treatments significantly increased soil moisture content （P < 0.05）. All treatments used < 0.25 mm aggregates as the dominant particle size. Fertilization could significantly increase the content of large aggregates （aggregate structure units with diameter > 0.25 mm）. At the same time， fertilization treatments significantly increased the soil geometric mean diameter （GMD）， average weight diameter （MWD）， and R0.25 value （ > 0.25 mm aggregate content） and reduced the fractal cone number （D） and aggregate destruction rate （PAD） values （P < 0.05）. Fertilization also promoted the aggregation and stability of soil aggregates， with the OM treatment having the greatest effect. Compared with that in the CK treatment， fertilization could significantly increase soil organic carbon content by 31.71%-209.67%， with the OM treatment showing the most significant change. Different treatments of soil organic carbon were mainly distributed in large aggregates. Compared with that in the CK treatment， each treatment significantly increased the contribution rate of organic carbon in large aggregates by 19.34%-47.76%， with the OM treatment having the most significant effect （P < 0.05）. In general， chemical fertilizer combined with organic fertilizer could promote the formation of large aggregates in acidic purple soil， improve the stability of soil aggregates， and increase the content of soil organic carbon， which is an effective measure to improve the soil structure and improve the quality of acidic purple soil. |
