摘要
以海南省儋州热带农业生态系统国家野外科学观测研究站长期定位试验为依托,选择不施肥(CK)、单施无机肥(NPK)和有机无机配施(NPKOM)3种施肥处理模式,利用多光谱技术(紫外–可见光谱和三维荧光光谱技术)结合平行因子分析(PARAFAC)研究不同施肥模式对热区砖红壤剖面溶解性有机质(DOM)含量及光谱特征的影响。结果表明:与CK处理相比,NPK和NPKOM处理均降低了砖红壤DOM的含量。在剖面分布上,表层(0~20 cm)土壤DOM的含量显著高于其他层(20~100 cm)土壤。PARAFAC分析结果显示,砖红壤DOM主要由陆源类腐殖质(Ex/Em=355 nm/428 nm,C1)、天然富里酸(Ex/Em=420 nm/471 nm,C2)和类蛋白质(Ex/Em=310 nm/346 nm)3个荧光组分组成,NPK和NPKOM处理均显著增加了C1组分和C2组分的相对丰度,而降低了C3组分的相对丰度;C1和C2组分的相对丰度均随着土层深度呈现降低趋势,而C3组分则呈现增加趋势。综上,由于施肥增加农作物残体累积及根系分泌物释放,加上有机肥自身源DOM的释放,与CK处理相比,NPK和NPKOM处理土壤DOM腐殖化程度增加而自生源特征降低,NPK和NPKOM处理耕层(0~40 cm)土壤DOM的芳香性及疏水性显著低于CK处理。
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.
作者
王涵
刘宗岳
窦圣龙
刘畅
窦九九
刘钰钦
陈淼
WANG Han;LIU Zongyue;DOU Shenglong;LIU Chang;DOU Jiujiu;LIU Yuqin;CHEN Miao(School of Environmental Science and Engineering,Hainan University,Haikou 570228,China;Environment and Plant Protection Institute,Chinese Academy of Tropical Agriculture Sciences,Haikou 571101,China;Hainan Danzhou Tropical Agro-ecosystem Nation Observation and Research Station,Danzhou,Hainan 571737,China;College of Resources and Environment,Huazhong Agricultural University,Wuhan 430070,China)
出处
《土壤》
北大核心
2025年第5期1013-1024,共12页
Soils
基金
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)
中央级公益性科研院所基本科研业务费专项(1630042022001,1630042023006)资助。
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
Fertilization pattern
Latosol
Dissolved organic matter(DOM)
Spectral characteristics
Profile features
