UV-B辐射增强对陆地生态系统碳循环的影响

作为全球变化的重要现象之一,紫外射线B(UV-B,波长280～320 nm)辐射增强对陆地生态系统碳循环具有重要影响.UV-B辐射增强主要通过改变植物的光合作用、凋落物分解以及土壤呼吸来影响陆地生态系统碳的输入和转化输出.其他气候因子(大气CO2浓度、温度和水分)可能会促进或减缓UV-B辐射对陆地生态系统碳循环的作用.本文介绍了UV-B辐射增强的背景,综述了国内外近年来UV-B辐射增强及与其他气候因子交互作用对陆地生态系统碳循环的影响,总结了目前研究存在的不足,讨论了未来的研究重点和方向.

Effects of enhanced UV-B radiation on terrestrial ecosystem carbon cycle:A review

As one of the most important phenomena of global climate change,the enhancement of ultraviolet-B radiation(UV-B,280-320 nm) could have critical impact on the carbon cycle in terrestrial ecosystem.Through the impacts on plant photosynthesis,litter decomposition,and soil respiration,the enhanced UV-B radiation can affect the carbon input,turnover,and output of terrestrial ecosystem.Other climatic factors(ambient CO2 concentration,air temperature,and precipitation) may promote or mitigate the impact of enhanced UV-B radiation on terrestrial ecosystem carbon cycle.This paper introduced the background of UV-B radiation enhancement,reviewed the impacts of enhanced UV-B radiation and its interactions with other climatic factors on terrestrial ecosystem carbon cycle,summarized the existing problems in related researches,and discussed the priorities and directions of future researches.