摘要
通过室内试验,研究膜孔肥液自由入渗中土壤容重对土壤含水率、土壤硝态氮和铵态氮的分布以及均匀性的影响.结果表明:土壤含水率和土壤铵态氮以膜孔为中心逐渐减小,而土壤硝态氮以膜孔为中心先增大后减小;土壤容重越大,土壤含水率、土壤硝态氮和铵态氮在水平方向和垂直方向分布的距离越小,肥液的累积入渗量越小;土壤容重越大,土壤含水率和土壤硝态氮分布的均匀性系数越小,而土壤铵态氮分布的均匀性系数越大.这为研究膜孔肥液灌溉技术奠定了基础.
Based on the indoor experiments,the influences of soil bulk density on distribution and uniformity of soil moisture,NO3--N and NH4＋-N under film hole irrigation with fertilizer liquid free infiltration were studied.The results showed that soil moisture and NH4＋-N decreased around the film hole;NO3--N first increased and then decreased around the film hole;the lager the soil bulk density was,the smaller the distribution distance of soil moisture,NO3--N and NH4＋-N in horizontal and vertical direction were,and the smaller the accumulative infiltration quantity of fertilizer liquid was.The lager the soil bulk density was,the smaller the uniformity coefficient of soil moisture and NO3--N were,but the lager the uniformity coefficient of NH4＋-N was.The results lay a foundation for further research of film hole fertilizer liquid irrigation technology.
出处
《浙江大学学报（农业与生命科学版）》
CAS
CSCD
北大核心
2010年第6期650-656,共7页
Journal of Zhejiang University:Agriculture and Life Sciences
基金
国家自然科学基金资助项目(50579064)
西南林业大学水土保持与荒漠化防治重点学科资助项目
关键词
膜孔灌
肥液自由入渗
土壤容重
分布
均匀性系数
film hole irrigation
fertilizer liquid free infiltration
soil bulk density
distribution
uniformity coefficient
