冻融期不同秸秆覆盖厚度下土壤水分差异性分析  

Analysis of Soil Moisture Difference under Different Straw Mulch Thickness in Freeze-thaw Period

作　　者：吴春东 刘天祥[1] Wu Chundong;Liu Tianxiang(College of Engineering,Heilongjiang Bayi Agricultural University,Daqing163319)

机构地区：[1]黑龙江八一农垦大学工程学院,大庆163319

出　　处：《黑龙江八一农垦大学学报》2022年第2期99-106,共8页journal of heilongjiang bayi agricultural university

基　　金：黑龙江八一农垦大学校内项目(2042070021)。

摘　　要：为了探究冻融期不同秸秆覆盖厚度下土壤水分的差异性,确定保水性最佳的秸秆覆盖方式,采用大田试验的方法,将试验区分为四种处理,分别为裸地、5、10和15 cm厚度整秸秆覆盖。通过中子仪测定不同剖面深度的土壤总含水率,结果表明:秸秆覆盖可以改变表层土壤及深层土壤20~60 cm剖面深度含水率的波动幅度,有效提高冻融期土壤水分,对深层100 cm以下剖面深度土壤含水率影响较弱。无论是表层土壤,还是深层土壤,三种覆盖处理下,10 cm整秸秆覆盖处理的土壤含水率差异系数最大,其次为15 cm整秸秆覆盖处理,最小为5 cm整秸秆覆盖处理。虽然秸秆覆盖厚度是以5 cm为倍数增加,但是土壤含水率差异系数并未呈现规律性的变化,同时对于土壤含水率的波动幅度的影响也并非呈单调趋势。因此10 cm整秸秆覆盖厚度(12000 kg·hm^(-2))保水效果最好,为最佳覆盖方式。In order to explore the difference of soil water content under different straw mulching thickness in freezing-thawing period and determine the best straw mulching method for water retention,the field test method was adopted to divide the test area into four treatments:bare ground,whole straw mulching with 5,10 and 15 cm thickness,respectively.The results showed that straw mulching could change the fluctuation range of soil moisture content in 20~60 cm section and the deep soil,effectively improve the soil moisture content in freezing-thawing period,but had little effect on the soil moisture content in the section below 100 cm.For both surface soil and deep soil,the difference coefficient of soil moisture content in 10 cm whole straw mulching treatment was the largest,followed by 15 cm whole straw mulching treatment and 5 cm whole straw mulching treatment.Although the straw mulching thickness increased by 5 cm,the difference coefficient of soil moisture content did not change regularly,and the influence on the fluctuation range of soil moisture content did not show a monotonous trend.Therefore,the whole straw covering thickness of 10 cm(12000 kg·hm^(-2))was the best way to retain water.

关 键 词：冻融期 秸秆覆盖 土壤水分 差异系数 

分 类 号：S152[农业科学—土壤学]