Benthic nutrient pools in mangrove forests, Hinchinbrook Island, North Queensland

Four sites (bank, low-, mid- and high-intertidal) were sampled between October 1987 and December 1992. Data was collected for analyses of sediments, roots, porewater, solid-phase nutrients, sediment-water exchange, and timber and prop root tidal exchange.Sediment porosity and mean dry sediment density and redox potential were measured.Root biomass was estimated and the contribution of root-derived C, N, and P to the bulk sediment pools was calculated.Porewater measures of dissolved inorganic nutrient concentrations (µM) of: ammonium, nitrite, nitrate, silicate and phosphate. Solid-phase nutrients measures of: total organic carbon, total nitrogen and total phosphorus concentrations.Sediment-water exchange measured fluxes of silicate, DON, ammonium, phosphate, DOP and ammonium, nitrite and nitrate.Exchange rates between fallen timber and prop roots with tidal water were estimated - wet and dry weights were measured.
To examine variations in nutrient fluxes in mangrove associated sediments over a five year period.

1987年10月至1992年12月期间，研究人员对4个采样位点（岸带、低潮潮间带、中潮潮间带及高潮潮间带）开展了采样工作。本次采集的数据用于沉积物、根系、孔隙水（porewater）、固相营养盐（solid-phase nutrients）、沉积物-水界面交换（sediment-water exchange）以及枯木与红树林支柱根（prop root）的潮间带交换相关分析。已测定沉积物孔隙度、平均干沉积物密度与氧化还原电位（redox potential）；估算了根系生物量，并计算了根系来源的碳（C）、氮（N）、磷（P）对沉积物整体库的贡献占比。孔隙水检测涵盖溶解态无机营养盐浓度（单位：微摩尔/升，µM）的测定，具体包括铵态氮、亚硝态氮、硝态氮、硅酸盐与磷酸盐；固相营养盐检测则包含总有机碳、总氮与总磷的浓度测定。沉积物-水界面交换通量的测定指标包括硅酸盐、溶解态有机氮（Dissolved Organic Nitrogen, DON）、铵态氮、磷酸盐、溶解态有机磷（Dissolved Organic Phosphorus, DOP）以及铵态氮、亚硝态氮与硝态氮的通量。此外，研究还估算了枯落木与支柱根和潮汐水体之间的交换速率，并测定了二者的湿重与干重。
本研究旨在探究五年周期内红树林关联沉积物中营养盐通量的变化特征。