| UV-B辐射增强对土壤有机碳稳定性的影响 |
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| 引用本文： | 蒋梦蝶,王秋敏,徐 鹏,林 杉,邬 磊,赵劲松,胡荣桂.UV-B辐射增强对土壤有机碳稳定性的影响[J].水土保持学报,2017,31(2):171-176. |
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| 作者姓名： | 蒋梦蝶 王秋敏 徐 鹏 林 杉 邬 磊 赵劲松 胡荣桂 |
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| 作者单位： | 1. 华中农业大学资源与环境学院,武汉,430070;2. 华中农业大学资源与环境学院,武汉430070;湖北省襄阳市环境保护监测站,湖北襄阳441000;3. 华中农业大学资源与环境学院,武汉430070;华中农业大学环境生态中心,武汉430070 |
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| 基金项目： | 国家重点基础研究发展计划项目(2012CB417100)，中央高校基本科研业务费专项(2662016PY098) |
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| 摘 要： | 以母质相同、有机碳含量不同的2个水稻土为研究材料,通过室内模拟光照,探讨紫外辐射(UV-B,280~315nm)对土壤总碳(TC)、可溶性有机碳(DOC)和复合酚(AEP)含量的影响以及土层厚度不同(0.95,1.89,2.84mm)对UV-B辐射的响应特征。结果表明:与黑暗处理相比,培养96h后,无论是在有机碳含量低的土壤(A土)还是在有机碳含量高的土壤(B土)中,UV-B辐射均显著降低了土壤TC的含量,却增加了土壤DOC的含量,在试验结束时,土壤A和B的TC含量分别降低了3.11%和6.18%,而土壤DOC含量分别增加了16.05%和9.89%。在UV-B辐射96h后,与1.89,2.84mm土层相比,土层厚度为0.95mm时土壤TC、DOC和AEP含量变化幅度最大,A和B两个土壤中TC含量分别降低了19.11%和14.35%,DOC和AEP含量分别增加了18.66%和18.92%与23.52%和22.70%,而UV-B辐射对厚度为1.89mm和2.84mm的土层TC、DOC和AEP含量并无显著影响。研究结果表明UV-B辐射对土壤碳库稳定性有一定的影响,在农业生产中为了保护碳库稳定性,应该尽量减少地表裸露。
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| 关 键 词： | UV-B辐射 TC DOC AEP 有机碳稳定性 |
Effects of Elevated UV-B Radiation on the Stability of Soil Organic Carbon |
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| JIANG Mengdie,WANG Qiumin,XU Peng,LIN Shan,WU Lei,ZHAO Jingsong,HU Ronggui.Effects of Elevated UV-B Radiation on the Stability of Soil Organic Carbon[J].Journal of Soil and Water Conservation,2017,31(2):171-176. |
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| Authors: | JIANG Mengdie WANG Qiumin XU Peng LIN Shan WU Lei ZHAO Jingsong HU Ronggui |
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| Abstract: | Two kinds of paddy soil with different organic carbon contents were selected to evaluate the effects of ultraviolet radiation (UV-B,280 to 315 nm) on soil total carbon (TC),dissolvable organic carbon (DOC),and alkali-extractable phenolics (AEP),and to characterize the responses of soils of different thicknesses (0.95 mm,1.89 mm and 2.84 mm) to UV--B radiation by simulated incubation experiment.The results demonstrated that,compared with dark treatment,UVB radiation significantly decreased soil TC by 3.11％ and 6.18％,but increased DOC concentration by 16.05％ and 9.89％ for the two soils with low (A) and high (B) organic carbon content at the end of the experiment.After 96 h UV-B radiation,compared to the soil of 1.89 mm and 2.84 mm thickness,UV-B radiation had more significant effects on soil TC,DOC and AEP in the thinnest soil (0.95 mm),TC was reduced by 19.11％ and 14.35％,but soil DOC concentration was increased by 18.66％ and 18.92％,and AEP concentration was increased by 23.52％ and 22.70％ in the thinnest treatments (0.95 mm) for soil A and B,respectively,but there was no significant difference observed between the soils of 1.89 mm and 2.84 mm thickness.It was concluded that UV-B radiation had significant effects on the stability of soil carbon pool,and the completely bare surface should be reduced as much as possible to protect the stability of the soil carbon pool. |
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| Keywords: | UV-B radiation total carbon dissolvable organic carbon alkali-extractable phenolics organic carbon stability |
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