亚热带森林土壤可溶性有机质结构对降水减少的响应

陈滢伊; 鲍勇; 李帅军; 高颖; 孙颖; 焦宏哲; 司友涛; 钱伟

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亚热带森林土壤可溶性有机质结构对降水减少的响应

首发时间：2019-03-13

陈滢伊 ¹
陈滢伊(1994-),性别:女,主要研究方向:森林生态学
鲍勇 ² 李帅军 ¹ 高颖 ² 孙颖 ¹ 焦宏哲 ² 司友涛 ¹
司友涛（1979-），男，副研究员、硕导，森林氮碳循环
钱伟 ²

1、福建师范大学地理科学学院, 福州 350007
2、福建师范大学湿润亚热带山地生态国家重点实验室培育基地, 福州 350007

摘要：全球气候变化，区域降水减少。降水量作为生态系统中主要的环境驱动因素日益受到关注。该研究以福建省三明米槠天然林的土壤为研究对象，利用紫外-可见和三维荧光光谱，结合土壤基本理化性质，讨论降水减少对亚热带天然林土壤中可溶性有机质（DOM）的数量、组成和来源的影响。结果表明：相比对照，隔离30%降雨和隔离60%降雨处理下，0-10 cm土层的土壤可溶性有机碳(DOC)浓度分别降低了27.6%和52.1%，可溶性有机氮(DON)浓度降低分别显著降低了43.7%和42.7%，且浓度都显著高于10-20cm土层的对应处理；0-10cm土层隔离30%降雨处理的芳香化指数与对照相比显著增加了77.1%；腐殖化指数表明，隔离30%降雨使源于微生物代谢的类腐殖质物质增加，荧光指数和生源指数在隔离60%降雨后显著降低；平行因子分析中组分3表明本地区土壤可能存在外来有害有机物。综上，降水减少对亚热带天然林土壤DOM的数量及化学结构的变化影响显著，光谱技术可以较好地反映降水减少对亚热带天然林土壤中DOM组成和来源的影响，能为构建更精准森林生物化学循环模型、碳平衡评估提供依据。

关键词：生态学隔离降雨可溶性有机质紫外-可见光谱红外光谱三维荧光光谱

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Response of Soil Soluble Organic Matter Structure to Precipitation Reduction in Subtropical Forest

Chen Yingyi ^{1
2}
陈滢伊(1994-),性别:女,主要研究方向:森林生态学
Bao Yong ^{1
2} Li Shuaijun ^{1
2} Gao Ying ^{1
2} Sun Ying ^{1
2} Jiao Hongzhe ^{1
2} Si Youtao ^{1
2}
司友涛（1979-），男，副研究员、硕导，森林氮碳循环
Qian Wei ^{1
2}

1、School of Geography Sciences, Fujian Normal University, Fuzhou 350007, China
2、 and State Key Laboratory of Sub-tropical Mountain Ecology (Founded by

Abstract：Global climate change and regional precipitation decrease. As the main environmental driving factor in ecosystem, precipitation has attracted more and more attention. This study, the soil of Castanopsis carlesii natural forest in Fujian Province was taken as the research object, and the effects of precipitation reduction on the quantity, composition and source of DOM in the soil of subtropical natural forest were discussed by using ultraviolet-visible, infrared and three-dimensional fluorescence spectra, combined with the basic physical and chemical properties of soil. The results show that: compared with the control, reducing 30% rainfall and reducing 60% rainfall treatment, the concentration of dissolved organic carbon (DOC) in 0-10 cm soil layer decreased by 27.6% and 52.1%. The concentration of dissolved organic nitrogen (DON) decreased by 43.7% and 42.7% respectively. The concentration of DOC and DON is significantly higher than the corresponding treatment of 10-20 cm soil layer; The aromatization index of reducing 30% rainfall in 0-10 cm soil layer increased by 77.1% compared with the control. Three-dimensional fluorescence spectroscopy and humification index showed that reducing 30% rainfall could increases humus-like substances derived from microbial metabolism. Fluorescence index and source index decreased significantly after reducing 60% rainfall; Infrared spectra showed that reducing rainfall treatment could increase phenolic substances in soil; Component 3 of the parallel factor analysis indicates that there may be harmful exotic organic matter in the soil of this region. In conclusion, the decrease of precipitation has a significant effect on the amount and chemical structure of soil DOM in subtropical natural forests. Spectroscopy can better reflect the effect of precipitation reduction on DOM composition and source in the soil of subtropical natural forest. It can provide a basis for building more precise forest biochemical cycle model and carbon balance assessment.

Keywords： Ecology Reduce rainfall Dissolved Organic Matter Ultraviolet spectrum Infrared spectrum Three-dimensional fluorescence spectra

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陈滢伊，鲍勇，李帅军，等. 亚热带森林土壤可溶性有机质结构对降水减少的响应[EB/OL]. 北京：中国科技论文在线 [2019-03-13]. https://www.paper.edu.cn/releasepaper/content/201903-138.

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论文编号	201903-138
论文题目	亚热带森林土壤可溶性有机质结构对降水减少的响应
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