This paper analyzes three tapes of photosynthetic carbon dioxide fixation paths,compares the differences of different carbon dioxide fixation paths in the water utilization,and advances some quick identification methods of C3 and C4 plants.
The seed setting pattern characteristics which was explained by branches,infructescence,single fruit of Caryopteris mongolica Bunge were analyzed based on the two years study data from natural and artificial populations.The results showed as follows:influenced by water and nutrient conditions of the habitats,all of the seed produchion,size and thousand-seed weight of the artificial population were higher than those of the natural one.However,the seed production of different populations exhibited the same regulation on branches,it appeared as the middle base top.Due to the dichasium differentiation characteristics of C.mongolica,the percentage of abortive nutlets reduced from the edges to the intermediate part in a single infructescence,which manifested as the selective abortion.The numbers and positions of abortive seeds were uncertain.
