不同沙土配比根系层导水特性研究  

Hydraulic conductivity characteristics of rootzones at different ratios of sand to soil

作　　者：宋桂龙[1] 韩烈保[1] 李德颖[2] 

机构地区：[1]北京林业大学省部共建森林培育与保护教育部重点实验室,草坪研究所 [2]美国北达科他州立大学作物科学系

出　　处：《北京林业大学学报》2008年第4期89-94,共6页Journal of Beijing Forestry University

基　　金："十一五"国家科技支撑计划课题(2006BAD16B09);教育部"新世纪优秀人才"支持计划项目

摘　　要：采用定水头法研究了不同沙土配比根系层的渗透特性，探讨沙土组成比例对土壤渗透特性的影响规律，并结合运动场草坪根系层饱和导水率推荐标准及处理间的差异显著性，对各处理土壤的渗透性进行综合分析。结果表明：随着含沙量增加，无论是原状土还是压实的扰动土，土壤饱和导水率均增加，增加趋势先缓后快，m（沙）：m（土）=7：3时（沙粒含量〉80％）增幅明显，与沙粒含量拟合均呈显著的指数函数关系；土壤稳定人渗率在草坪成坪前和成坪2个月后的变化趋势与室内测定饱和导水率基本一致，呈极显著的线性关系；按照处理间导水率的差异显著性，11个处理的饱和导水率基本可分为3类，即m（沙）：m（土）〈3：7（沙粒含量〈60％）、m（沙）：m（土）为3：7～7：3（沙粒含量60％～80％）、m（沙）：m（土）〉7：3（沙粒含量〉80％）。Hydraulic conductivity characteristics of rootzones and influencing rules of different ratios of sand to soil were studied by stable water suction under saturated condition. The results were analyzed synthetically according to the recommended standard of sports tuft and difference level. The main results are as follows ： with sand content increasing, saturated hydraulic conductivity was increased exponentially, not only at undisturbed rootzones but also at disturbed rootzones. When sand/soil ratio exceeded 7：3 （sand content more than 80% ）, saturated hydraulic conductivity was increased evidently. Before being tufted and after two month, steady infiltration rate shows the same trend with saturated hydraulic conductivity and both have a distinct linear relationship. According to the difference level, 11 treatments were divided three groups. First group was the sand/soil ratio of less than 3：7 （sand content lower than 60% ）, second group was the sand/soil ratio from 3： 7 to 7：3 （sand content between 60% and 80%） and third group was the sand/soil ratio of more than 7：3 （sand content more than 80%）.

关 键 词：运动场草坪 沙土配比 根系层 导水特性 

分 类 号：S753.533[农业科学—森林经理学]