Plant Diversity Distribution of Mountains in Rural Landscapes£othe Combined Influences of Topography and Land Use Investigation of the Mineral Nutrients Status of Pear Leaves in Main Orchards Around the Bohai Bay Region THE COORDINATED DEVELOPMENT AND ANALYSIS OF CONTRIBUTING FACTORS OF COTTON BOLLWORM RESISTANCE TO INSECTICIDES IN ROUND-BOHAI BAY-REGION INVESTIGATION ON THE DISTRIBUTION OF CODLING MOTH IN SHANDONG,LIAONING AND HEBEI Variation characteristics of macrobenthic communities structure in tianjin coastal region in summer NO3-/NO2-  inhibits sulfatereducing activity of the enrichment culture of sulfatereducing prokaryotes from an offshore oil reservoir at Bohai Bay, China. Investigation of the Mineral Nutrients Status of Pear Leaves in Main Orchards Around the Bohai Bay Region