A dynamic model for the predator-prey system in the presence of environmental fluctuations Responses of Photosynthetic Characteristics of Winter Wheat Cultivars Released in Different Decades to Water Deficit in North China Plain Evolvement of soil quality in salt marshes and reclaimed farmlands in Yancheng coastal wetland. Study on space evolvement mechanism of grassland and field community in ecotone between agriculture and animal husbandry in north China Studies of commonly used traditional medicine-ginger