Seagrass nutrient uptake influenced by below-ground sulphide: a split-chamber hydroponic experiment.

Rhizome sections of Halophila ovalis were collected from the Swan River Estuary at Pelican Point (31°59 S, 115°49 E) in January 2006 and were planted into a hydroponic, split-chamber experiment with constant water flow, designed to only expose below-ground seagrass biomass to sulphide. Sulphide concentrations were maintained at 0, 0.25 and 1 and 4 mM S2- and uptake of seagrass measured by removal of phosphate and ammonium from below-ground water. It was hypothesised that exposure of Halophila ovalis to below-ground sulphide would inhibit the capacity for ammonium and phosphate uptake and photosynthetic efficiency would be reduced.

2006年1月，研究团队于天鹅河河口（Swan River Estuary）鹈鹕点（Pelican Point，坐标31°59 S, 115°49 E）采集卵叶喜盐草（Halophila ovalis）的根状茎切段，将其栽种于配备恒水流的分室水培实验装置中，该装置仅使海草的地下生物量暴露于硫化物环境。实验设置0、0.25、1与4 mM的硫离子（S²⁻）浓度梯度，通过监测地下水体中磷酸盐与铵态氮的去除量，测定海草的养分吸收情况。本研究提出假说：卵叶喜盐草暴露于地下硫化物环境时，其铵态氮与磷酸盐的吸收能力将受到抑制，且光合效率会降低。