Bao Tao, Zhu Renbin, Wang Pei, Ye Wenjuan, Ma Dawei, Xu Hua
Anhui Province Key Laboratory of Polar Environment and Global Change, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230036, China.
State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, China.
Sci Rep. 2018 Feb 27;8(1):3716. doi: 10.1038/s41598-018-21881-1.
Stratospheric ozone has begun to recover in Antarctica since the implementation of the Montreal Protocol. However, the effects of ultraviolet (UV) radiation on tundra greenhouse gas fluxes are rarely reported for Polar Regions. In the present study, tundra NO and CH fluxes were measured under the simulated reduction of UV radiation in maritime Antarctica over the last three-year summers. Significantly enhanced NO and CH emissions occurred at tundra sites under the simulated reduction of UV radiation. Compared with the ambient normal UV level, a 20% reduction in UV radiation increased tundra emissions by an average of 8 μg NO m h and 93 μg CH m h, whereas a 50% reduction in UV radiation increased their emissions by an average of 17 μg NO m h and 128 μg CH m h. No statistically significant correlation (P > 0.05) was found between NO and CH fluxes and soil temperature, soil moisture, total carbon, total nitrogen, NO-N and NH-N contents. Our results confirmed that UV radiation intensity is an important factor affecting tundra NO and CH fluxes in maritime Antarctica. Exclusion of the effects of reduced UV radiation might underestimate their budgets in Polar Regions with the recovery of stratospheric ozone.
自《蒙特利尔议定书》实施以来，南极平流层臭氧已开始恢复。然而，极地地区紫外线辐射对苔原温室气体通量的影响鲜有报道。在本研究中，在过去三年的夏季，于南极海洋性地区模拟紫外线辐射减少的情况下，对苔原一氧化氮（NO）和甲烷（CH）通量进行了测量。在模拟紫外线辐射减少的情况下，苔原地区的NO和CH排放显著增加。与环境正常紫外线水平相比，紫外线辐射减少20%使苔原排放平均增加8μg NO m-2 h-1和93μg CH m-2 h-1，而紫外线辐射减少50%使它们的排放平均增加17μg NO m-2 h-1和128μg CH m-2 h-1。未发现NO和CH通量与土壤温度、土壤湿度、总碳、总氮、NO-N和NH-N含量之间存在统计学显著相关性（P>0.05）。我们的结果证实，紫外线辐射强度是影响南极海洋性地区苔原NO和CH通量的一个重要因素。随着平流层臭氧的恢复，排除紫外线辐射减少的影响可能会低估极地地区它们的收支情况。
