| 黄河三角洲不同植物群落土壤有机碳特征及其影响因子 |
| 摘要点击 1002 全文点击 263 投稿时间：2023-08-16 修订日期：2023-10-08 |
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| 中文关键词 黄河三角洲 土壤有机碳（SOC） 溶解性有机质（DOM） 潮上带湿地 植物群落 |
| 英文关键词 Yellow River Delta soil organic carbon（SOC） dissolved organic matter（DOM） supratidal wetland plant community |
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| 中文摘要 |
| 土壤有机碳的变化对于土壤质量演变有着十分重要的意义. 以黄河三角洲潮上带芦苇（Phragmites australis）、盐地碱蓬（Suaeda salsa）和柽柳（Tamarix chinensis）群落为研究对象,分析0~50 cm土层范围内土壤有机碳（SOC）、易氧化有机碳（EOC）、溶解性有机碳（DOC）和颗粒有机碳（POC）的分布特征,并基于紫外-可见光谱、三维荧光光谱和平行因子分析（PARAFAC）技术,对土壤溶解性有机物（DOM）的组成和来源进行解析,最终结合土壤理化性质揭示影响不同植物群落土壤有机碳和DOM组分特征的关键因子. 结果表明：①不同群落比较,盐地碱蓬群落ω（SOC）最高,为7.53 g·kg-1,柽柳群落ω（DOC）最高,为0.98 g·kg-1,芦苇群落ω（EOC）和ω（POC）显著高于盐地碱蓬和柽柳群落,分别为1.47 g·kg-1和0.65 g·kg-1；垂直分布上,除POC含量外,均呈现出随着土层加深而降低的趋势. ②芦苇、盐地碱蓬和柽柳群落土壤DOM的主要成分均为腐殖质、类蛋白物质、类富里酸物质,其中外源组分在以上群落中占比分别为55.80%、56.41%和52.81%；③不同群落比较,芦苇群落的腐殖化程度显著高于盐地碱蓬和柽柳群落,但其芳香化程度和自生源占比显著低于柽柳群落；垂直分布上,DOM芳香化和腐殖化程度随土层的加深逐渐增加,且深层土主要以疏水组分占比低的相对分子质量小的DOM为主. ④冗余分析可知,N（P<0.01）、NO2--N（P<0.01）和NH4+-N（P<0.05）是影响土壤有机碳和DOM组分变化的关键因子. |
| 英文摘要 |
| Changes in soil organic carbon （SOC） are of great importance to the evolution of soil quality. The distribution characteristics of soil organic carbon （SOC）, easily oxidizable organic carbon （EOC）, dissolved organic carbon （DOC）, and particulate organic carbon （POC） were investigated in the 0-50 cm soil layer of the Phragmites australis, Suaeda salsa, and Tamarix chinensis communities of the supratidal zone in the Yellow River Delta as the research subjects. Then, the composition and sources of soil dissolved organic matter （DOM） were analyzed based on the UV-vis spectroscopy, three-dimensional excitation emission matrix spectroscopy, and parallel factor analysis （PARAFAC）. Finally, the key factors affecting the characteristics of soil organic carbon and DOM fractions of different plant communities were finally revealed in combination with the physicochemical properties of the soil. The results showed that： ① Comparing different communities, the S. salsa community had the highest ω（SOC） at 7.53 g·kg-1, the T. chinensis community had the highest ω（DOC） at 0.98 g·kg-1, and the P. australis community had significantly higher ω（EOC） and ω（POC） than those of the S. salsa and T. chinensis communities at 1.47 g·kg-1 and 0.65 g·kg-1, respectively. The vertical distribution showed a tendency to decrease with deeper soil layers, except for POC concentration. ② The main components of soil DOM of the P. australis, S. salsa, and T. chinensis communities were humus, protein-like substances, and fulvic acid-like substances, of which exogenous components accounted for 55.80%, 56.41%, and 52.81% in the above communities, respectively. ③ Comparing different communities, the humification degree of the P. australis community was significantly higher than that of the S. salsa and T. chinensi communities, but its aromaticity and proportion of biological sources were significantly lower than those of the T. chinensi community. On the vertical profile of the soil, DOM aromaticity and humification degree gradually increased with the deepening of the soil layer, and the deeper soils were mainly dominated by small molecular weight DOM with a lower proportion of hydrophobic fraction. ④ Redundant analysis showed that N （P<0.01）, NO2--N （P<0.01）, and NH4+-N （P<0.05） were the key factors affecting the changes in soil organic carbon and DOM fractions. |
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