北京市大兴区典型土壤水分入渗规律田间试验研究.pdfVIP

2009, 14( 4) : 98- 102 Journal of China Agricultural University 武敏 冯绍元 孙春燕 霍再林 ( , 100083) 对北京市大兴区3种典型土壤的水分入渗规律及其影响因素进行试验研究 双套环法田间现场测定了 大兴区11 个试验点的土壤水分入渗过程, 运 经验模型对各试验点的入渗曲线进行拟合结果表明: 入渗过程达到 稳定的时间由快到慢依次为壤质砂土砂质壤土和粉砂壤土; 初始含水率与入渗初始阶段的速率呈线性相关关系; 土 壤结构和干扰等条件基本一致的前提下, 稳定入渗率由大到小依次为壤质砂土砂质壤土和粉砂壤土; 土壤质地大致 相同的条件下, 土壤容重越大, 其稳定入渗率越小总体上, Horton 入渗模型在该研究区域适 性较好 北京市大兴区; 双套环法; 入渗; 土壤类型; 田间试验 S 152.7 1007-4333(2009) 04-0098-05 A Field experimental study onsoil infiltration process of Daxing District,Beijing * WU Min, FENG Shao yuan , SUNChunyan, HUO Zai lin (College of Water Conservancy and Civil Engineering, China Agricultural University, Beijing 100083, China) Abstract The infiltration process and its influencing factors of 3 typical soils in Daxing District, Beijing w ere studied. Double-ring method was us ed to measure the soil infiltration curves of 11 sites. At the same time, the infiltration curves were developed with empirical models. The result show s that the infiltration process in the loamy sand reaches stable fastest, and it takes a longer time to reach stable in the s andy loam, and the silty loam reaches stable the slowest; there is a linear correlation between the initial water content and the initial infiltration rate; under the similar soil structure and disturbed condition, the stable infiltration rate of the loamy sand is the biggest, the sandy loam takes the second place, and the stable infiltration rate of the s ilty loam is the smallest; under the similar soil texture, the stable infiltration rate decreas es with the increase of the bulk densit