Effects of light, temperature and ground water level on the CO 2 flux of the sediment in the high water temperature seasons at the artificial north salt marsh of Osaka Nanko bird sanctuary, Japan

Water Column Turbidity Not Sediment Nutrient Enrichment Moderates Microphytobenthic Primary Production

“…This suggests highly turbid sites may rely on emerged periods (which were net autotrophic across all sites) to sustain and support benthic primary production. This is in agreement with studies from around the world reporting the restriction of benthic primary production to emerged periods only, owing to light limitation through high turbidity [21,22,62]. Despite the maintenance of MPB productivity over emerged periods, the higher production during emergence does not always fully compensate for the lower production during submergence, as evidenced by the consistently higher MPB production estimates during submerged compared to emerged tidal periods at the least turbid sites (Figures 4 and 5).…”

Responses of soil CO2 and CH4 emissions to changing water table level in a coastal wetland

“…2c). Previous studies have demonstrated that soil CO 2 emissions decreased with increasing of water table level in the laboratory (Jungkunst et al, 2008;Kane et al, 2013;Yang et al, 2013Yang et al, , 2017Matysek et al, 2019) and field experiments (Furukawa et al, 2005;Miao et al, 2013;Yamochi et al, 2017;Cao et al, 2017;Hoyos-Santillan et al, 2019). On the one hand, the mineralization of organic matter is increased by O 2 diffusion into deeper soil layers.…”

“…Therefore, changes in water table level may have a pronounced effect on wetland ecosystem, as well as potential carbon-climate feedbacks (Rotzoll and Fletcher, 2012;Cowling, 2016;Taylor et al, 2013;Carretero and Kruse, 2012). However, existing studies have primarily focused on the relationship between greenhouse gases emissions and water table levels in peatlands, while studies in salt marshes are lacking (Chimner and Cooper, 2003;Turetsky et al, 2008;Berglund and Berglund, 2011;Ishikura et al, 2017;Yang et al, 2014;Cao et al, 2017;Wang et al, 2017;Olsson et al, 2015;Yamochi et al, 2017). Therefore, more investigations are required to elucidate the influence of water table level on soil CO 2 and CH 4 in coastal wetlands.…”