关键词: 大型底栖动物, 大型底栖动物, 功能摄食类群, 生态系统, 健康评价, 湟水河, 土地利用类型

Abstract: This study aims to provide a basis for the safe production of rice under future climate change. Two high-yield rice varieties‘Nanjing 9108’and‘Nanjing 46’in Jiangsu Province were chosen as experimental materials, machine-transplanted seedling and mechanized direct seeding were simulated, and the effects of increasing temperature and high temperature on the main nutrients N and P in rice under different planting patterns were explored. At the beginning of the heading stage, normal temperature, increasing temperature and high temperature were conducted for 15 days in the phytotron, the dynamic changes of N and P contents in different organs of rice were analyzed. The results showed that increasing temperature and high temperature treatments significantly increased N and P contents in various organs of rice. The variation of N content in various organs under high temperature treatment was generally greater than that of increasing temperature treatment. Under the same increasing temperature treatment, the increase of N content in each organ was in the order of stem>leaf>ear. There was no significant difference in the change of P content between high temperature treatment and increasing temperature treatment. From the heading stage to the maturity stage, under the same planting pattern and increasing temperature treatment, compared with the normal temperature treatment, the increase of N and P contents in different organs of rice differed between the two tested varieties, and the tolerance to climate change of‘Nanjing 46’was greater than that of‘Nanjing 9108’. Under the same temperature treatment and variety, the transport efficiency of N and P from stem to leaf under direct seeding was higher than that under transplanting.