title: [Using in-situ reflectance to monitor the chlorophyll concentration in the surface layer of tidal flat].
abstract: An optical monitoring method is proposed for the rapid, non destructive measurements of chlorophyll concentration (Chl-a) in the surface sediments of emerged tidal flat, and it can be further applied in remote sensing work. Hyperspectral reflectance of intertidal sediments were measured in day time at the tidal flats of the Sishili Bay, the Northern Yellow Sea, and surface sediments (3 mm) were sampled for the in-door measurements of Chl-a. On the basis of the reflectance at 650, 675 and 700 nm, the indices of normalized difference index of microbenthos (NDI-MPB) and trough depth (T-depth) were proposed for the measurements of microphytobenthos biomass. T-depth can be used to remove the linear background spectral noises and indicate the existence of microphytobenthos; Good linear relationship was observed between NDI-MPB and Chl-a content in sediments (2.22-49.36 mg x m(-2), r > 0.99), which may be used to monitor the biomass of microphy to benthos.
authors.affiliation: Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China. qgxing@yic.ac.cn
authors.forename: Qian-Guo
authors.initials: QG
authors.lastname: Xing
authors.forename: Ding-Feng
authors.initials: DF
authors.lastname: Yu
authors.forename: Ming-Jing
authors.initials: MJ
authors.lastname: Lou
authors.forename: Ying-Chun
authors.initials: YC
authors.lastname: Lü
authors.forename: Shao-Peng
authors.initials: SP
authors.lastname: Li
authors.forename: Qiu-Ying
authors.initials: QY
authors.lastname: Han
mesh_terms: D002734:Chlorophyll / Q000032:analysis*; D019015:Geologic Sediments / Q000382:microbiology*; D009792:Oceans and Seas; D010839:Phytoplankton / Q000378:metabolism*; D018515:Plant Leaves / Q000737:chemistry / Q000254:growth & development; D058998:Remote Sensing Technology / Q000379:methods; D012542:Scattering, Radiation; D012623:Seawater / Q000382:microbiology*; D013057:Spectrum Analysis
chemical_list: D002734:Chlorophyll