摘要
通过大田试验,采用秸秆沟埋还田方式,设置沟埋深度分别为20、30、40、50 cm及对照5个处理,将上季作物秸秆进行全量还田(秸秆沟埋量为2 kg.m-1),研究水稻秸秆沟埋还田对麦田土壤含水量、温度、容重和孔隙度等的影响。结果表明,降水结束后12 d内,沟埋深度20和30 cm处理土壤含水量(与埋草沟边水平距离10 cm处)显著下降(P<0.05);而沟埋深度40和50 cm处理土壤含水量(与埋草沟边水平距离10 cm处)与对照差异未达显著水平。埋草沟秸秆下层土壤温度变化较小,秸秆对下层土壤具有保温作用;除沟埋深度20 cm处理外,其他不同沟埋深度处理均能明显降低秸秆上层土壤容重,增加土壤总孔隙度,使耕层土壤疏松。
A field experiment was carried out to have all the straws of the preceding rice crop returned to the field by burying them into furrows to the depth of 20,30,40 and 50 cm,separately,at a rate of 2 kg·m-1.The experiment was designed to study effects of this practice on moisture,temperature,bulk density and porosity of the soil in the wheat field.It was found that 12 days after rainfall,soil moisture was significantly lower in the plots with straws buried into furrows 20 and 30 cm in depth than in the plot without straw buried,but not so significant in the plots of with straws buried into furrows 40 and 50 cm in depth.Temperature of the soil underneath the straw did not vary much in all the straw burial plots,demonstrating that the buried straw has an insulating effect to the soil below.Straw burial could also significantly lower bulk density and increase total porosity of the soil,except in the plot with straw buried only 20 cm in depth,thus making the plaw layer of the soil looser.
出处
《生态与农村环境学报》
CAS
CSSCI
CSCD
北大核心
2012年第4期399-403,共5页
Journal of Ecology and Rural Environment
基金
中央级公益性科研院所基本科研业务专项
环保公益性行业科研专项(201109024)
关键词
水稻秸秆
沟埋还田
水分
温度
容重
rice straw
return of straw through burial in furrows
moisture
temperature
bulk density
