Thermal effect on the marine phytoplankton in Xiangshan Bay, China Effects of Recreational Disturbance on the Cotinus coggygria var. cinerea Forest in Xiangshan Mountain, Beijing Distribution of marine bacteria and their environmental factors in Xiangshan Bay Distribution of net-phytoplankton and its influence factors in spring in Xiangshan Bay Analysis of natural landscape value change in recent 20 years of Xiangshan Park in Beijing The bacterial ecological distribution in water and sediment of cage culture area in Xianshangang Bay Studies on the environment and biodiversity of the desert grassland area in Xiangshan Mountain,Ningxia