摘要
应用盘式吸渗仪测定田间土壤导水率具有快速简单的优点,但是测定结果的计算处理比较繁琐,寻求简单的计算方法是广泛应用盘式吸渗仪的关键问题。该文改变盘式吸渗仪测定土壤导水率的三维入渗过程为一维入渗过程,简化了测定结果的计算处理。结果显示:两种不同的一维入渗过程达到的稳定入渗率和导水率之间有很好的线性关系,但是三维过程计算的导水率大于一维过程。双套盘吸渗仪一维过程计算导水率与稳定入渗率一致性较好,但是和三维稳态、瞬态方法计算结果之间差异明显,因此在应用这些方法时需要适当调整参数,建议使用双套盘吸渗仪快速测定田间土壤导水率。
The disc tension infiltrometer was limited to measure soil hydraulic conductivity because it is difficult to calculate the results from the three-dimensional infiltration process. In this paper, the three-dimensional infiltration was changed to one-dimensional infiltration of disc tension infiltrometers to measure soil hydraulic conductivity in situ, which simplified the calculating processes. The results show that a significant correlation between steady infiltration rate and hydraulic conductivity in the limited one-dimensional infiltration, and the same results are gained from double-disc tension infiltrometer. However, the results from three-dimensional infiltration are bigger than that from one-dimensional infiltration. Distinct differences among one-dimensional infiltration, steady and transient calculating methods are observed. The double-disc tension infiltrometer is a good equipment for determining soil hydraulic conductivity.
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2007年第10期14-18,共5页
Transactions of the Chinese Society of Agricultural Engineering
基金
中国科学院"百人计划"
"西部之光"
国家自然科学基金(40601041
50479065)资助
关键词
盘式吸渗仪
一维入渗过程
土壤导水率
disc tension infiltrometer
one-dimensional infiltration process
soil hydraulic conductivity
