辽西半干旱地区春小麦农田水分循环特征的研究

Characteristics of Water Cycling in Spring Wheat Field in Semi-arid Area of West Liaoning.

一、研究地区的生态条件概述辽西属暖温带半干旱低山丘陵区,自然条件差,干旱少雨,干燥度为1.2左右,年均降水量为480.1mm,可能蒸散量为551.7mm,水分亏缺严重,而且70—75%的雨水降子6—8月份,春季偏少。舂季气温回升快,风速大,土壤水分蒸发损失严重,因此春旱频繁。

The maximum water-consumption of spring wheat in semi-arid area of west Liaoning is atthe stages of jointing-heading and milking,but the daily maximum consumption is at flow-ing stage.Soil moisture regime is decisive to water-consumption of spring wheat.Under fa-vourable conditions of water supply,the moisture in lower soil layers is relatively less effec-tive for increasing yield.A reasonable irrigation system can raise the water utilization effici-ency of wheat.310—340mm can be used as a reference value of water requirement and consu-mption of spring wheat in west Liaoning.Winter irrigation is significant for the growth anddevelopment of spring wheat.