农业现代化研究2025，Vol.46Issue(2)：366-375,10.DOI:10.13872/j.1000-0275.2024.1735
硅藻土对稻田土壤团聚体组成及其碳氮储量的影响
Effects of diatomit on soil aggregate composition and carbon and nitrogen storage in paddy soil
摘要
Abstract
The effects of diatomite on the distribution,stability,and carbon and nitrogen content of soil aggregates in paddy fields were investigated to provide a theoretical foundation for optimizing fertilization practices and improving carbon and nitrogen sequestration.A field experiment was conducted in 2021 in Jingzhou City,Hubei Province,to analyze the impacts of four fertilization treatments:no application of diatomite or nitrogen fertilizer(CK),conventional chemical fertilizer(NPK),diatomite application alone(Si),and the combined application of chemical fertilizer and diatomite(NPKSi)on the composition of soil aggregates and the distribution of carbon and nitrogen within the 0-20 cm tillage layer.Results indicated that,compared with CK,NPK and NPKSi treatments significantly increased the proportion of>0.25 mm aggregates by 2.66%and 8.28%,respectively,while reducing the proportion of silt and clay particles(<0.053 mm aggregates)by 14.99%and 22.50%,respectively.The mean weight diameter(MWD)and geometric mean diameter(GMD)followed the order:Si<CK<NPK<NPKSi.NPK and NPKSi treatments significantly enhanced soil organic carbon(SOC)content and stock,with increases of 10.60%and 17.67%,and 8.84%and 14.42%,respectively,compared to CK,whereas the Si treatment showed no significant difference.Additionally,the NPKSi treatment markedly improved soil total nitrogen(TN)content and stock,outperforming all other treatments.Across different aggregate sizes,NPK and NPKSi treatments increased organic carbon and total nitrogen content,whereas the Si treatment caused a slight decrease.Super aggregates(>2 mm)under NPK and NPKSi treatments contributed the most to organic carbon and total nitrogen,with contribution rates of 30.91%and 36.71%,and 32.81%and 38.99%,respectively.In conclusion,the combined application of diatomite and nitrogen fertilizer significantly increased the proportion of large aggregates,improved aggregate stability,and enhanced the contribution rates of organic carbon and total nitrogen,thereby effectively boosting carbon and nitrogen storage in paddy soils.关键词
水稻土/硅藻土/团聚体稳定性/有机碳/全氮Key words
paddy soil/diatomite/aggregate stability/organic carbon/total nitrogen分类
农业科技引用本文复制引用
方映涵,李双龙,翟金磊,曾茜倩,聂江文,蒋梦蝶,刘冬,刘章勇,金涛..硅藻土对稻田土壤团聚体组成及其碳氮储量的影响[J].农业现代化研究,2025,46(2):366-375,10.基金项目
国家自然科学基金项目(42377287).Supported by the National Natural Science Foundation of China(42377287). （42377287）
