摘要
为揭示土壤容重对膜孔灌条件下土壤水分分布特征和氮素运移转化的影响,通过土壤容重室内试验,利用非线性回归法对试验资料进行分析,研究提出了湿润体内土壤含水率及其变化量和变化率、土壤硝态氮及其转化量和转化率、土壤铵态氮及其转化量和转化率与土壤容重和运移转化时间的经验公式。结果表明:经验公式的相关系数均大于0.8200,标准误差很小,且通过0.05的显著性检验,可以反映膜孔灌条件下不同土壤容重的土壤水分分布特征和氮素运移转化规律。该研究为提高膜孔灌水氮利用效率提供参考。
In order to reveal the effects of soil bulk density on the soil moisture distribution and nitrogen transportation and transformation under the film hole irrigation,the indoor experiment of soil bulk density,was done and analyzed by the non-linear regression method,empirical formulas that indicates the relationship among the variable quantity and rate of soil moisture,the conversion quantity and rate of NO-3-N and NH + 4-N,and soil bulk density,the transportation and transformation time were put forward.The ...
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2009年第2期6-11,共6页
Transactions of the Chinese Society of Agricultural Engineering
基金
国家自然科学基金项目资助(50579064)
关键词
膜孔灌
土壤容重
水分分布
氮素运移转化
film hole irrigation
soil bulk density
soil moisture distribution
nitrogen transportation and transformation
