Benthic community production and respiration during emersion along the Danshuei River

• Main Authors: Chen-Hua Li, 李晨華
• Other Authors: Hsing-Juh Lin
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/12611818169636205559

碩士 === 國立中興大學 === 生命科學系所 === 102 === Global warming has become a serious problem in recent years. Carbon sequestration in wetlands plays an important role in global carbon cycle. Determination of the primary production would quantify the carbon sequestration, which could be used to calculate economical value of an ecosystem. Microphytobenthos (MPB) are important primary producers inestuarine wetlands, but the capacity of carbon sequestration has rarely been quantified. This study was conducted every two months from August 2011 to October 2012. In total, there were 7 study sites along the Danshuei River from upstream to the estuary. Benthic gross community production (GCP) and community respiration (CR) were determined using the in situ closed-chamber flux method during emersion along the Danshuei River by monitoring CO2 fluxes in benthic chambers on intertidal sandflats. The results showed that MPB biomass increased from the estuary to the upstream, with the highest value at WG and the lowest at E. Both GCP (0.003 – 0.016 g C m-2 day-1) and CR (0.22 – 1.16 g C m-2 day -1) were higher in summer and fall and lower in spring and winter. The main influencing factors were MPB biomass, macrofaunal biomass, soil bacterial biomass, sediment grain size, and nutrient concentrations. To provide an accurate annual budget of community production during emersion, factors such as tidal cycle, MPB vertical migration and diurnal cycle were also taken into account in the calculations. Annual net benthic community production during emersion was estimated to be -216.34 g C m-2 yr-1, suggesting that the CR of the intertidal wetlands along the Danshuei River was high so that not enough supply of primary production for the use by the benthic community or a system of carbon source.