水土保持学报2017，Vol.31Issue(2)：171-176,6.DOI:10.13870/j.cnki.stbcxb.2017.02.029
UV-B辐射增强对土壤有机碳稳定性的影响
Effects of Elevated UV-B Radiation on the Stability of Soil Organic Carbon
摘要
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.关键词
UV-B辐射/TC/DOC/AEP/有机碳稳定性Key words
UV-B radiation/total carbon/dissolvable organic carbon/alkali-extractable phenolics/organic carbon stability分类
农业科技引用本文复制引用
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):171-176,6.基金项目
国家重点基础研究发展计划项目(2012CB417100) （2012CB417100）
中央高校基本科研业务费专项(2662016PY098) （2662016PY098）
