| 有机物料添加后滨海盐渍土壤溶解性有机碳变化 及其紫外-可见光谱特征 |
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| 引用本文： | 范之馨,张焕朝,陈捷,王艮梅.有机物料添加后滨海盐渍土壤溶解性有机碳变化 及其紫外-可见光谱特征[J].安徽农业大学学报,2021,48(3):444-451. |
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| 作者姓名： | 范之馨 张焕朝 陈捷 王艮梅 |
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| 作者单位： | 南方现代林业协同创新中心,南京210037;南京林业大学林学院,南京210037 |
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| 基金项目： | 江苏省农业科技自主创新项目[CX(17)1004]资助。 |
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| 摘 要： | 利用紫外-可见光谱技术研究不同盐分水平(低盐、高盐)土壤中添加不同有机物料后土壤DOC的紫外-可见光(UV-Vis)光谱特征变化,探究盐渍土壤碳库的稳定性.结果显示,添加有机物料能显著增加DOC含量,与生物炭和有机肥相比,秸秆处理后的土壤DOC含量更高.在200～800 nm波长范围内,两种盐分土壤DOC溶液的吸光值随着波长增加均呈降低趋势,在230～280 nm内出现吸收平台.低盐土壤,DOC含量和紫外-可见光谱特征区域面积积分比值均对应地高于高盐土壤的值,而A250/A365及A240/A420比值则低于高盐.相关性分析表明,土壤DOC含量与254 nm处吸光值呈显著线性相关(R2＞0.9,P＜0.05),用于表征DOC特征的紫外光谱特征参数之间的相关性在高盐、低盐土壤上并不完全一致.由此说明,有机物料处理后,低盐土壤的DOC腐殖化程度、芳香性、相对分子量和团聚化程度都对应的比高盐土壤的更高.在高盐土壤上,添加不同物料的土壤DOC各项紫外特征参数之间无显著差异;在低盐土壤上,秸秆处理后土壤DOC的芳香性及疏水性与其他处理有显著差异.DOC结构复杂且受环境影响较大,需要结合多种参数判断其结构特征.
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| 关 键 词： | 有机物料 盐渍土 溶解性有机碳 性质 紫外-可见光谱 |
Ultraviolet-visible spectral characteristics of soil dissolved organic carbon (DOC) in coastal saline soil after adding organic materials |
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| FAN Zhixin,ZHANG Huanchao,CHEN Jie,WANG Genmei.Ultraviolet-visible spectral characteristics of soil dissolved organic carbon (DOC) in coastal saline soil after adding organic materials[J].Journal of Anhui Agricultural University,2021,48(3):444-451. |
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| Authors: | FAN Zhixin ZHANG Huanchao CHEN Jie WANG Genmei |
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| Institution: | Co-Innovation Center for the Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210037; College of Forestry, Nanjing Forestry University, Nanjing 210037 |
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| Abstract: | To explore the stability of the saline soil carbon pool, the UV-Vis spectroscopy technology was used to study the changes in the UV-Vis spectral characteristics of soil DOC after adding different organic materials to soils with different salt levels (low salinity, high salinity). The results showed that DOC content was higher in soil with wheat straw than in soil with biochar or organic fertilizer. In the 200-800 nm wavelength range, the absorbance value of soil DOC solutions decreased with the increase of wavelength, and an absorption plateau appeared in 230-280 nm. The results also showed that, in low salinity soil, for all treatments, the DOC contents in and the integral ratios of the area of each characteristic region of the ultraviolet-visible spectrum were correspondingly higher than those in soils with high salinity. However, the ratios of A250/A365 and A240/A420 were lower than those in high salinity soils. Correlation analysis showed that there was a significant linear correlation between the content of soil DOC and the absorbance value at 254 nm (R2>0.9, P<0.05). The correlation among the characteristic parameters of the ultraviolet spectrum used to characterize DOC characteristics were different in high salinity soil and low salinity soil. As a whole, it showed that the degree of humification, aromaticity, relative molecular weight and agglomeration of DOC in low salinity soils were correspondingly greater or higher than those in high salinity soils with the addition of organic materials. There was no significant difference among the UV characteristic parameters of soil DOC with different organic materials regardless of high salinity soils. DOC composition was complex and easily affected by the environment |
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| Keywords: | organic materials salt soil dissolved organic carbon (DOC) characterization Ultraviolet-visible spectrum |
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