Study On Water Characteristics Of The Main Soils In Corn Belt Of Songliao Plain

Soil water is an important part of the soil ecosystem and the crucial material basis of plantgrowth and development. Research of soil water effectiveness and its least limiting water range(LLWR) has an extremely important practical significance to cultivate high-yielding soils. Inthis study, the main corn belt Songliao Plain soil for the study, analyzes and evaluates Albic soil,chernozem and black high soil low-yielding soil structural characteristics, soil water constant offeatures and least limiting water range, revealing the the main features of the plains farming soilwater in Songliao.(1) Basic physical properties of the main farming corn belt soil in Songliao Plain of the soilwere as follows: there are obvious differences between different levels of the same cross-sectionof soil physical and chemical properties. There are significant differences in high andlow-yielding soil bulk density, porosity mechanically and the composition of the APlayer. Inaddition to Albic soil, in the various levels of the same soil type, soil bulk density values wereless than the low-yielding soils display yielding the law, Albic soil bulk density is higher thanthe yield of low-yielding soil; characteristics of Ap total porosity of the soil layer performance,high-yield soil albic soil is less than low-yielding soil, chernozem and black soil high yield werehigher than low-yielding soils."Silty+clay" content of Ap layers of three soil types presentsthat high production soils are greater than the low-yielding soils.(2) The structural stability of the soil in high yield APlayer compared with the low-yielding,rupture structure ratio was significantly reduced, significantly higher content of R0.25, MWD andGMD significantly increased. Considering the correlation analysis of the composition ofwater-stable aggregates and soil structural point, water0.5~5mm between stable aggregatescontent is an important factor in determining the merits of structural soil, the higher the content,the more stable soil structure structural more gifted.(3) Soil water characteristic constants include: saturated water content, capillary water, fieldcapacity, wilting moisture content, maximal hygroscopic water and available water.Comparisonof soil water characteristics constant discovery of three soil types, soil saturated water contentshowed black soil> albic bleached soil> chernozems; highest capillary water in Black soil, albicbleached soil with lower chernozem soil; field capacity and wilting with water appeared as blacksoil> Albic bleached soil> chernozem; maximum absorption of water in black and albicbleached soil showed similar soil, chernozem minimum; effective water content is manifested chernozem> albic bleached soil> black soil. Description water storage, water retention of blacksoil was strong. There is a significant correlation between soil water and soil structuralcharacteristics constant.(4) Evaluating of water characteristics of three soil types using the soil LLWRperformance presents that: LLWR of albic bleached soil with low soil productivity changes insoil bulk density has the similar trend, when the bulk density <1.35g/cm3increases, LLWRwith soil bulk density and increased large, when the bulk density>1.35g/cm3increases, LLWRwith soil bulk density decreases rapidly; significant changes in the level of production occurredin chernozem soil bulk density of1.5g/cm3soil when LLWR, when the bulk density <1.5g/cm3when LLWR yield increased with soil bulk density increases and decreases, both low-yieldingsoil LLWR increases with bulk density and soil LLWR yield significantly greater than thelow-yielding soils. When the bulk density>1.5g/cm3, LLWR of all rapidly reduced andconverged. The LLWR black soil bulk density changes with the realization of, high soil bulkdensity <1.44g/cm3time, LLWR gradually decreased with increasing density, when density>1.45g/cm3time, LLWR rapidly reduced. Low-yielding soil bulk density <1.31g/cm3, the bulkdensity of the soil LLWR with the increases, and when the capacity of a material at1.49g/cm3or more, the soil LLWR increased rapidly with the bulk density decline. Different types of thesame soil fertility compared to the same bulk density of soil conditions and high yield whitepulp chernozem soil LLWR significantly better than low-yielding soils. Three soil LLWRcomparison, when the soil bulk density less than1.3g/cm3time, LLWR yield performance ofchernozem soil> black soil> albic bleached soil l when the soil bulk density less than1.5g/cm3,the low yield in the performance of the soil LLWR black soil> albic bleached soil> chernozem.At the same time, soil LLWR and soil bulk density has the highly significant correlation.