| Data of precipitation and total water content in 0～200 cm soil layer on the 8th day each month from March to November during 1989～2005 is used to analyze the characteristics of the change of annual average soil moisture content,the moisture distribution in every layer in special years,speed of soil moisture loss and its influencing factors in the growth period of winter wheat.The results show: The annual total soil water content changes obviously,and the middle and late 1990s is a period of water deficiency;The amount of annual soil water content in the same layer in the period of crop growth always presents an order of the year with abundant precipitation ≥ the year with normal precipitation>the year with deficient precipitation.For many years the average speed of soil moisture consumption in 0～200 cm soil layer is 1.98 mm/d,with a minimum of 1.40 mm/d and a maximum of 2.54 mm/d,and a difference of 1.81 times between the two;The monthly moisture loss increases gradually from March to May,with a maximum in May,thereafter it begins to reduce;The annual precipitation is the most prominent climate factor influencing the speed of annual soil moisture consumption,passing 0.001 reliable degree examination and reaching extremely prominent relevant levels,while the growth of winter wheat also has a great influence on monthly speed of soil water consumption. |