Effects of Different Wavelengths of Ultraviolet Light on the Photolysis of Easily Extractable Humus in Severely Rocky Desertification Soils
KONG Ling1, WANG Yan1, 2, 3, WANG Ke-qin1, ZHAO Yang-yi1, ZHANG Ye-fei1, 2, 3*
1. Rocky Desertification Research Institute, College of Soil and Water Conservation, Southwest Forestry University, Kunming 650224，China
2. Engineering Research Center of Stony Desertification Prevention in Universities of Yunnan Province, Kunming 650224，China
3. Key Laboratory of Ecological Environment Evolution and Pollution Control in Mountainous and Rural Areas of Yunnan Province, Kunming 650224，China
Abstract：This study focuses on the soil of severely rocky desertification,simulating the photolysis process under various wavelengths of ultraviolet(UV) light in drought conditions.The aim is to investigate the decomposition and transformation process of easily extractable humus in severely rocky desertification under varying UV light exposures. The results indicated that: (1) Under various wavelengths of UV irradiation, the total carbon (TC) and total nitrogen (TN) levels in severely rocky desertification soil showed an upward trend as the irradiationtime increased. However, the decrease in the C/N indicated that the irradiation of UV light promoted mineralization and decomposition rate of humus. (2) The contents of primary amine, double bond, carbonate, and O—H of carboxy were stabilized after fluctuating change in the humus easily extracted from the severely rocky desertification soil. They affected the hydrocarbon-generating process to varying degrees depending on various wavelengths of UV irradiation. (3)With increased irradiation time, the substituent group on the benzene ring of the easily extractable humus gradually became dominated by aliphatic chains, the degree of aromatization was enhanced, and the hydrophobic component was increased under UVA and UVB irradiation.In conclusion, ultraviolet radiation in different wavelengths could affect the capacity for hydrocarbon generation, promote the condensation and aromatization of easily extractable humus, and accelerate the process of soil humus mineralization.
孔 玲，王 妍，王克勤，赵洋毅，张叶飞. 不同波段紫外光对重度石漠化土壤易提取态腐殖质光解的影响[J]. 光谱学与光谱分析, 2025, 45(08): 2311-2316.
KONG Ling, WANG Yan, WANG Ke-qin, ZHAO Yang-yi, ZHANG Ye-fei. Effects of Different Wavelengths of Ultraviolet Light on the Photolysis of Easily Extractable Humus in Severely Rocky Desertification Soils. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2025, 45(08): 2311-2316.
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