土壤2025，Vol.57Issue(5)：1013-1024,12.DOI:10.13758/j.cnki.tr.2025.05.008
不同施肥处理下砖红壤溶解性有机质含量和光谱特性的剖面分布特征
Profile Distribution Characteristics of Latosol Dissolved Organic Matter Content and Spectral Properties Under Different Fertilization Treatments
摘要
Abstract
This study was conducted at the long-term positioning experimental field of the Hainan Danzhou Tropical Agro-ecosystem Nation Observation and Research Station,China.Three treatments,including no fertilization(CK),inorganic fertilization(NPK),and combined inorganic-organic fertilization(NPKOM),were selected to investigate the impacts of different fertilization patterns on DOM concentration and spectral characteristics in the latosol profile using multiple spectral techniques(ultraviolet-visible spectroscopy,and three-dimensional fluorescence spectroscopy)and parallel factor analysis(PARAFAC).The results showed that compared with CK,DOM contents were reduced under NPK and NPKOM,and DOM contents in the surface layer(0-20 cm)were significantly higher than those in other layers(20-100 cm).PARAFAC analysis results suggested that DOM was mainly composed of three fluorescent components:terrestrial humic-like substances(Ex/Em=355 nm/428 nm,C1),natural fulvic acid(Ex/Em=420 nm/471 nm,C2),and protein-like substances(Ex/Em=310 nm/346 nm,C3).NPK and NPKOM significantly increased the relative abundances of C1 and C2 components but decreased that of C3 component.With the increase of soil depth,the relative abundances of C1 and C2 components decreased,whereas that of C3 component increased.In conclusion,due to fertilization increasing the accumulation of crop residues and the release of root exudates,coupled with the release of DOM from organic fertilizer itself,the humification degree of DOM under NPK and NPKOM increased while the autochtonous source characteristics decreased in contrast with CK.Furthermore,the aromaticity and hydrophobicity of DOM in the cultivated soil layer(0-40 cm)under NPK and NPKOM were significantly lower than those under CK.关键词
施肥模式/砖红壤/溶解性有机质(DOM)/光谱特性/剖面特征Key words
Fertilization pattern/Latosol/Dissolved organic matter(DOM)/Spectral characteristics/Profile features分类
农业科技引用本文复制引用
王涵,刘宗岳,窦圣龙,刘畅,窦九九,刘钰钦,陈淼..不同施肥处理下砖红壤溶解性有机质含量和光谱特性的剖面分布特征[J].土壤,2025,57(5):1013-1024,12.基金项目
中国热带农业科学院国家热带农业科学中心科技创新团队项目(CATASCXTD202411)和中央级公益性科研院所基本科研业务费专项(1630042022001,1630042023006)资助. （CATASCXTD202411）
