Cangzhou City Analysis of soil moisture changes

• 1、Hebei Province Cangzhou Hydrology Bureau

Abstract：Based on the Czechoslovakia drought situation test house 2003-2006 year monitoring data, has analyzed the Cangzhou area soil state of moisture retention characteristic thoroughly, has studied the Czechoslovakia test house represents the region (the Binhai region of no relief) the soil state of moisture retention change rule. Uses the actual observed data, the analysis computation soil retrogression coefficient k value, and extracts month by month average k the value, the establishment draws back the soil moisture forecast plan. After the plan rainfall amount P~ rain soil moisture content θo~ rain increases the soil moisture △θ related chart, obtains increases the soil moisture computation empirical formula, established increased the soil moisture forecast plan. Two plans pass through the evaluation, its precision may satisfy this local state of moisture retention forecast the request. This state of moisture retention forecast plan, to reasonable instruction crops implementation irrigation, development high quality, high production, highly effective agriculture, uses the water resources reasonably, maintains the agricultural production continues the steady progression, has the vital significance.

Keywords： State of moisture retention forecast Soil retrogression coefficient k Rainfall amount P Before the rain, soil moisture content Theta After the rain, increases soil moisture △θ