The Reaserch On Photosynthetic Characteristics Of Halfmature Ziziphus Jujuba ‘Huizao’ Under Three Irrigations

Ziziphus jujuba ‘Huizao’ is the main variety of fruiter in Tarim Basin. But the irrigation is flood irrigation in common, water waste is very serious so that it is restricting and affecting the development course of Ziziphus jujuba Mill. while water-saving irrigation is studied. And the function in saving water of three irrigations should be tested by the photosynthetic characteristics. To choice the best irrigation to improve the photosynthetic characteristics of Ziziphus jujuba ‘Huizao’ under well-type irrigation(T1),drop irrigation(T2) and flood irrigation(T3) and the research is studied and it is meaningful to the development course of Ziziphus jujuba Mill. in Tarim Basin. Subject investigated of the thesis is the photosynthetic characteristics of Ziziphus jujuba cv.Huizao in Jiamu town in Wensu County in Akesu area, and the article mainly studies the diurnal changes, dynamic in irrigation period and variation within the year of photosynthetic parameters of 10 photosynthetic parameters of halfmature Ziziphus jujuba ‘Huizao’. The irrigation which advance the photosynthesis is based on the result of variance analysis. The conclusion mainly contains the following contents:(1)The analysis of characteristic of the diurnal changes, dynamic in irrigation period, variation within the year concludes as follows:the trend of same parameter is basically the same of diurnal changes of photosynthesis under the three irrigations in the same growth period; the trend of same parameter is different in the diurnal changes and irrigation period of photosynthesis under the three irrigations in the different growth period; the trend of same parameter is different in irrigation period of photosynthesis under the three irrigations in the same growth period; the trend of same parameter is same of variation within the year under the three irrigations; the trend of variation within the year of Pn、Gs、WUE、CE、LUE is same under the three irrigations,the trend of variation within the year of the other parameters is different.(2) The analysis and comparison of the diurnal changes, dynamic in irrigation period, variation within the year concludes as follows:T1 is more influential to T2,T3 of the diurnal changes of photosynthesis, dynamic in irrigation period, variation within the year and has higher mean value Pn、Gs、LUE、CE in the main growth phases of Ziziphus jujuba ‘Huizao’,this effect is more clear in fruit setting period and fruit development period;the mean value of variation within the year is show that Vpdl is T1<T2<T3 and T1 is highly significant difference to T2、T3,and the other parameters show that T1 is highly significant difference to T2、T3 and higher than T2、T3, so that the well-type irrigation is water-saving and it can ensure the photosynthesis.