Analysis on Change Tendency of the Precipitation Resource during Growth Period of the Conventional Crops in Plain Area before Taihang Mountains

摘要

[Objective]The aim was to study change tendency of the precipitation resource during growth period of the conventional crops in plain area before Taihang Mountains. [Method]Based on daily precipitation data at Shijiazhuang meteorological station in recent 51 years,average rainfall during growth periods of the 9 kinds of conventional crops was obtained. Precipitation tendency during growth periods of the 9 kinds of conventional crops in plain area before Taihang Mountains was analyzed by Mann-Kendall nonparametric test. [Result]Seen from rainfall during growth periods of the different crops,rainfall was the least during the growth period of winter wheat,followed by summer corn. Rainfall during growth periods of the cotton,oil plant,vegetable,fruit tree,potato,rice and legumes was more. Under different guaranteed rates,precipitation change also had difference. Rainfall change during growth periods of the wheat and corn was bigger,and rainfall change during growth period of the rice was smaller. Change degree of the precipitation during growth periods of the cotton,oil plant,vegetable,fruit tree and legumes was equivalent,while precipitation change during growth period of the potato was the biggest. Seen from change tendency of the precipitation during growth periods of the different crops,precipitation in the growth period of winter wheat was increasing at a speed of 0. 62 mm /a. However,precipitation in growth periods of the other crops had a decreasing tendency. Precipitation in the growth periods of summer corn and legumes decreased at the same speed which was 2. 11 mm /a,while precipitation in growth periods of the cotton,oil plant,vegetable,fruit tree,potato and rice decreased insignificantly. [Conclusion] The study laid foundation for determination of the agricultural irrigation water and provided theoretical reference for regional agricultural water-saving.