Research on Measurable Nonlinear Relationship Between Phytoplankton Biomass and Environmental Factors in Bohai Bay

B ased on the data of phytoplankton and environmental factors in the Bohai Bay, the dependence between the concentration of phytoplankton and environmental factors is analysed by linear correlation coefficient, rank correlation coefficient and Hoeffding test of independence .The result shows that wind-speed, air-pressure, surface temperature, field pH, salinity, DO, silicate and NO3- have a great impact on the concentration of phytoplankton.

苏区关税征管实践

在协定关税和厘金制度的双重束缚、压迫下,帝国主义的经济侵略无孔不入、无所不在,中华民族国势陵夷、民生凋敝,陷入了深重苦难和极度屈辱的境地。各根据地在实践中大胆创新、积极探索,苏区关税征管体系从无到有,渐趋完善、统一。广大苏区关税征管工作者一手拿算盘、一手握枪杆,硬是以苦涩的汗水和鲜红的热血,凝就了人民海关坚实的税魂,疏通了红色政权旺盛的财源。