Study On Effects Of Water-Saving And Increase Production Under The Covering Film With Spray Irrigation In Western Sandy Area Of Heilongjiang

Soil water is of critical importance to soil evolution and land productive forces, furthermore, can restrict formation and development of vegetation. The research about soil moisture dynamics is the foundation of temporal and spatial correlation of soil moisture. Studying and investigating soil moisture dynamics ,is not only useful for us to further understand the distribution law of temporal and spatial distribution of soil moisture, but also can provide some effective ways to forecast and simulate soil moisture change of more closer actual situation.In western semi-arid and aeolian sandy soil area of Heilongjiang province, rational development and utilization is the key of agricultural development in this area. film mulching is widely used in the semi-arid areas of northern China Because of this measure can improve water and ground temperature conditions of the tilth soil .Thus , improved two rows of maize on a big ridge and covered with plastic film is made in Dumeng Country, Heilongjiang Province in 2009, recording the meteorological data and growth performance of maize in whole growth period. Meanwhile, use drying method to investigate the volumetric moisture content of every root zone soil mixture. In this field experiment, the measure of improved two rows of maize on a big ridge and covered with plastic film is compared with the conventional tillage in sprinkler irrigation condition. Base on the vertical spatial distribution of soil moisture, combination of soil water dynamics and dynamic growth in maize, research the water dynamics and yield, the result indicated that:(1)Film coated and non-daily temperature shows the dynamic changes of the same, and under the observation of endometrial daily temperature higher than the daily average temperature is not coated. Laminating conditions at different times, different soil depths and the observed warming effect of the average daily temperature had different effects. From the perspective of all time, 14:00 the best temperature, warming the value 2.53℃.The warming effect of the preceding birth is better than later. In the depth, 0cm Department warming effect of the best temperature value reached 3.92℃, the greater the overall depth of the soil, the smaller the warming effect.(2) Increasing yield and income results are obvious. Big ridge double line mulching techniques can significantly improve the ear, corn production increased. Big ridge double line film technology combined with the average yield of irrigation supply water than conventional cultivation method without membrane were increased by 16.28%; water use efficiency than the conventional cultivation method without membrane were increased by 4.48 kg / mm·hm2.(3)Improved double-wide ridge mulching technology has obvious effect of rainwater harvesting by entropy. Irrigation amount of double-coated large ridge in the whole growth period of 0~100cm, the average soil water content than the conventional control area increased. Big Ridge double-coated condition, the vertical root zone soil moisture vary greatly, 0~30cm soil most intensively, 30~50cm deep the change more dramatic and complex, 50~90cm soil layers changed little .