摘要
为了寻求快速、直接、耗资低并且可用于评估野外饱和导水率的量级和其空间变异性的方法,利用PL-300土壤导气率测量仪对长武小麦试验田不同含水率、体积质量、土层、取样方向、根系密度下的导气率,以及室内原状土壤样本(248cm3)在田间持水率情况下的导气率及饱和导水率进行了研究。发现在不同的影响因素下导气率具有一定的变化规律;含水率接近田间持水率时的土壤导气率和饱和导水率之间存在对数线性关系。土壤导气率与饱和导水率的这种预测关系在早期的试验研究中也有所反映。将本试验结果与Loll、Iverson等人的研究成果进行对比论证,验证了通过测量土壤导气率预测田间饱和导水率的方法是可行的。
To seek the methods that are fast, direct, inexpensive as well as being used to assess the magnitude and spatial variability of Ks at field scale, we measured air permeability (Ka), bulk density, soil layers, directions, and plant root content under different water content, respectively by using soil air permeability measurement instrument (PL-300) in Changwu county, Shanxi province, and further Ks of undisturbed soil samples (248 cm^3) were measured in lab. Results showed that soil air permeability under different influence factors have a certain change law, and a log-log linear relationship between Ka measured at the actual soil-water content (close to field capacity) and Ks were found. The Ks-Ka relationship was in agreement with an earlier predictive relationship. Compared to Loll and Iverson's results, this method was confirmed to be feasible and practical.
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2009年第11期120-127,共8页
Transactions of the Chinese Society of Agricultural Engineering
基金
国家重点基础研究发展计划(973计划)(2005CB121103)
中国科学院知识创新工程重要方向项目(KSCX2-YW-N-003)
国家自然科学基金(40601041)
关键词
土壤
土壤水分
预测
模型
导气率
导水率
soils
soil moisture
forecasting
models
soil air permeability
water conductivity
作者简介
王卫华(1982-),女,陕西西安人,主要从事土壤物理方面的研究。西安西安理工大学水利水电学院,710048。Email:wangweihua1220@gmail.com
通信作者:王全九(1964-),男,教授,博士生导师,中国农业工程学会会员(E041200065S),主要从事农业水土工程方面研究工作。西安西安理工大学水利水电学院,710048。Email:wquanjiu@163.com