Effects of Spartina alterniflora invasion on soil methylmercury in coastal salt marshes
LONG Song-yuan1,2, ZHANG Man-yin1,2, LIU Wei-wei1,2, HU Yu-kun1,2, LI Jing1
1. Beijing Key Laboratory of Wetland Services and Restoration, Institute of Wetland Research, Chinese Academy of Forestry, Beijing 100091, China;
2. Heibei Hengshuihu National Wetland Ecosystem Research Station, Hengshui 053000, China
Four coastal salt marshes invaded by Spartina alterniflora spanning 11 degrees of latitudes were selected, and soil totalmercury (THg), methylmercury (MeHg) contents and environmental factors were compared and analyzed between S.alterniflora marshes and other salt marshes (native specieswith no mutual growth of S.alterniflora). The aim was to explore the effects of S.alterniflora invasion on the characteristics of soil methylmercury in coastal salt marshes in China. First, among four study sites, the rank of THg content was Minjiang Estuary ((115.327±18.220) μg/kg) > Hangzhou Bay ((37.792±3.761) μg/kg) > Yellow River Delta ((27.690±4.359) μg/kg) > Yancheng ((8.843±1.688) μg/kg); the rank of MeHg content was Hangzhou Bay ((0.589±0.134) μg/kg) > Yellow River Delta ((0.511±0.059) μg/kg) > Minjiang Estuary ((0.361±0.065) μg/kg) > Yancheng (0.191±0.027 μg/Kg). Second, the overall effect of S.alterniflora invasionhad no significant effect on soil MeHg and%MeHg of coastal salt marshes except for the Yellow River Delta where S.alterniflora invasion increased the MeHg content(95.0%). Third, among those two types of salt marshes, the correlation between%MeHg and THg was highly negative, and there was a threshold for this relationship (20~30μg/kg):when THg was lower than the threshold, the correlation between%MeHg and environmental factors was weak; while when THg was higher than the threshold,%MeHg was significantly correlated with environmental factors. This study investigated the effects of S.alterniflora invasion on soil methylmercury of coastal salt marshes with a large spatial span. Out study provided data supports for a more comprehensive evaluation of the impacts of S.alterniflora invasion on China's coastal areas, and also provided a basis for studying the migration and transformation of mercury in coastal wetlands.
龙颂元, 张曼胤, 刘魏魏, 胡宇坤, 李晶. 互花米草入侵对滨海盐沼土壤甲基汞的影响[J]. 中国环境科学, 2019, 39(12): 5200-5209.
LONG Song-yuan, ZHANG Man-yin, LIU Wei-wei, HU Yu-kun, LI Jing. Effects of Spartina alterniflora invasion on soil methylmercury in coastal salt marshes. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(12): 5200-5209.
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