Photosynthetic and Physiological Characteristics of Three Shrubs Species in Shell Islands of Yellow River Delta Photosynthetic and Physiological Characteristics of Eight Psammophilic Shrub Species in Northeast Ulanbuh Desert during the Late Growing Season Photosynthetic and Physiological Characters of the Flag Leaves in Cold and Warm Types of Wheat in Different Fertilization Modes Characteristics of Photosynthesis, Respiration and Water Utility of Four Tree Species of Natural Secondary Shrubs in a Semi-arid Loess Hilly-gully Region Effects of water-saving irrigation on water consumption and photosynthetic characteristics of winter wheat in Huang-Huai-Hai area of China