| In the Tarim Basin,with the vigorous development of the special forest industry and also it jujube industry by the impact of constantly growing in Aksu.Jujube planting area increased,which the growth of the age will increase the area of jujube production and promote the development of the region's economy,meanwhile,there's also an increase in the amount of agricultural irrigation water and the transformation of jujube trees from young to adult age.The problem of low water use efficiency caused by ground drip irrigation and micro-irrigation to conventional irrigation.The increase in irrigation water use is in contradiction with the lack of water resources in the region.In order to solve the contradiction,that the only way to keep irrigated area is to use water-saving irrigation techniques and to develop a reasonable irrigation system.In this study,in the Aksu area Wensu County Xinjiang Academy of Forestry good wood test station,which choose the 12 cm,18 cm large diameter grade jujube was selected as the research object,taking conventional flooding irrigation as a control,pit-type irrigation technology for the treatment,at the same diameter,the relationship between sap flow characteristics and meteorological factors were analyzed and compared,characteristics of different diameters of sap flow under the same irrigation.Finally,fruit yield,quality,water productivity as a consideration,the paper validates the feasibility of using the pit-type irrigation technology for large diameter grade jujube,feasible at the same time can improve the role of quality and efficiency.The main results with the study are as follows:(1)Under the condition of pit-type irrigation and irrigation flooding,the sap flow rate of 12 cm and 18cm diameter Hui jujube were significantly changed day and night,in daytime high night low,The curve is a wide"several"shape;Sap flow cumulative curve is"S"type in every growth period.The same growth period of the same diameter,the trend is more consistent with the pit-type irrigation and flood irrigation sap flow rate,the daily cumulative changes,but the sap flow rate and daily accumulation of the pit-type irrigation were more than flood irrigation;Under the same diameter,the daily accumulation and water consumption of pit-type irrigation and flood irrigation were significant different in the growth period(p<0.01);It is same that the large to small arrangement from the cumulative amount of the order and the growth period of water consumption,as followed,that the flowering fruit-bearing period>fruit enlargement period>fruit mature period>germination-frondescence period>deciduous period.Therefore,the pit-type irrigation use for large diameter grade jujube and can the water requirements of the whole growth period in fulfill(2)12 cm,18 cm diameter Hui jujube,in under the pit-type irrigation,flood irrigation mode,the main factor of sap flow dominant meteorological factors aren't in the every growth period at all.But also the among them,solar radiation,humidity,water vapor pressure deficit,importantly;It is better to establish a model for sap flow and meteorological factors in each growth period,which the R minimum is 0.929,R~2minimum is 0.864 or p is less than 0.01,the coefficient of the model before the weather factor can be seen to see the size of its contribution rate,thus knowing the determinants of sap flow rate at each growth period.(3)The same irrigation method of different diameter of Hui jujube sap flow rate start time and tend to stabilize in common,the daily trend is more consistent,the sap flow rate of the 18 cm diameter was more than 12 cm;In the pit-type irrigation,flood irrigation mode the relationship between the daily average rate,peak value and daily cumulative volume of 18cm and 12cm diameter jujube sap were fluctuated and fluctuated between the two sides.(4)under the pit-type irrigation,flood irrigation,the 12 cm,18 cm diameter Hui jujube of fruit yield per plant weight,per mu pit-type irrigation are greater than flood irrigation,and the difference is remarkable,with comprehensive evaluation of fruit quality pit-type irrigation are greater than flood irrigation;Analysis of two kinds of irrigation methods before and after,the jujube sap flow changes,the sap flow rate in the pit-type before and after irrigation was small,while the sap flow rate of flood irrigation was larger,The changes of sap flow and soil moisture content are closely related.12 cm diameter grade jujube pit-type irrigation compared to flood irrigation water saving 76.96%,yield 10.7%,water production efficiency increased by 329%,18 cm diameter grade jujube pit-type irrigation compared to flood irrigation water saving 76.96%,yield 14.65%,water production efficiency increased by 364%,so that the yield increase,the water productivity has increased the Pit-type irrigation relative to flood irrigation,and with the increase of the diameter of its quality and efficiency are more significant. |
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