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| 作物多样性（轮作）下砖红壤溶解性有机质含量及光谱特征 |
| Impact of crop diversity（rotation）on quantity and spectral characteristics of latosolic dissolved organic matter |
| Received:October 07, 2023 |
| DOI：10.13254/j.jare.2023.0627 |
| 中文关键词: 作物多样性，轮作，砖红壤，溶解性有机质，光谱分析 |
| 英文关键词: crop diversity, rotation, latosol, dissolved organic matter, spectral analysis |
| 基金项目:中央级公益性科研院所基本科研业务费专项（1630042022001，1630042023006） |
| Author Name | Affiliation | E-mail | | CHEN Xinyi | School of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China | | | LIU Yuqin | Environment and Plant Protection Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou 571101, China
Hainan Danzhou Tropical Agro-ecosystem National Observation and Research Station, Danzhou 571737, China | | | CHEN Miao | Environment and Plant Protection Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou 571101, China
Hainan Danzhou Tropical Agro-ecosystem National Observation and Research Station, Danzhou 571737, China | cataseppiael@163.com | | WANG Wenfeng | School of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China | |
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| 中文摘要: |
| 本研究依托海南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，设置玉米连作（单作物）、辣椒+玉米轮作（双作物）、辣椒+玉米/绿肥套种（三作物）和辣椒/玉米套种+豆角/绿肥套种（四作物）4种处理，利用紫外吸收光谱、三维荧光光谱结合平行因子法考察作物多样性（轮作）对研究区砖红壤溶解性有机质（DOM）含量及光谱特征的影响。结果显示，相比于单作物连作，增加作物多样性的轮作处理土壤有机质含量和持水率增加，但DOM含量降低。不同处理土壤DOM由可见光区类富里酸（Ex/Em=355 nm/432 nm，C1）、类腐植酸（Ex/Em=425 nm/471 nm，C2）和类蛋白（Ex/Em=325 nm/336 nm，C3）3种荧光组分组成，组分C1对DOM荧光组分贡献最高（47%~76%）。相比于单作物连作，增加作物多样性的轮作处理土壤DOM的C1组分相对丰度增加，而C2和C3相对丰度降低。光谱特征参数结果显示，单作物连作处理土壤DOM的芳香度（UV254、SUVA254）、腐殖化程度（HIX）及分子量（E2/E3、光谱斜率比SR）高于作物多样性轮作处理土壤。豆科作物的引入降低了三作物和四作物轮作处理土壤DOM的自生源特征。HIX与C1组分呈显著正相关（R2=0.96，P<0.05），表明土壤腐殖化程度主要由类富里酸物质贡献。研究结果可为热带地区土壤农业种植模式的构建和优化提供理论依据。 |
| 英文摘要: |
| This study was undertaken at the long-term positioning experiment of the Hainan Danzhou Tropical Agro-exosystem National Observation and Research Station, China. In this study, the following four treatments were applied：maize continuous cropping（single crop）; chili pepper/maize rotation（double crop）; chili pepper+corn/green manure intercropping（three crops）; and chili pepper/maize+bean/ green manure intercropping（four crops）. The aim of this study was to investigate the impact of crop diversity（rotation）on the quantity and spectral characteristics of latosolic dissolved organic matter（DOM）in a tropical region, using spectral techniques, including ultravioletvisible absorption spectra（UV-Vis）, three-dimensional excitation-emission matrix（3D-EEMs）, and parallel factor analysis（PARAFAC）. Our results showed that, compared with single crop continuous cropping, rotation with higher crop diversity increased soil organic matter and water holding capacity, but decreased DOM. Three fluorescent components of latosol DOM were obtained by PARAFAC analysis： fulvic acid component（Ex/Em=432 nm/355 nm; C1）, humic-like component（Ex/Em=471 nm/425 nm; C2）, and protein-like component（Ex/Em=336 nm/325 nm; C3）. In comparison with single crop continuous cropping, rotation with higher crop diversity increased the relative abundance of C1, but decreased the relative abundances of C2 and C3. Spectral indices demonstrated that aromaticity（UV254, SUVA254）, degree of humification（HIX）, and molecular weight（E2 /E3, Spectral slope rate）of DOM in the single continuous crop treatment were higher than those of the rotation treatments. The introduction of leguminous crops decreased the autogenetic characteristics of DOM in the three- and four-crop rotations. There was a significant positive correlation between HIX and C1 components（R2 =0.96, P<0.05）, indicating that the degree of soil humification was mainly contributed by fulvic acid-like substances. Our results provide a theoretical basis for the construction and optimization of soil agricultural planting patterns in tropical regions. |
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