摘要
选择旱伞草、芦苇、灯芯草、美人蕉4种不同根系特征的植物，通过控制分蘖数并借助反应器理论研究植物根系对基质水力条件及水质净化的影响。结果表明，植物分蘖数的增加过程可以用Logistic方程描述，无论初始栽种密度是多少，若不加以控制，植物生物量都会扩大到湿地所能容纳的最大密度．植物分蘖与根系发育总体上呈正相关关系．芦苇和灯芯草相关性较好，植株重一根重和分蘖数一根体积的相关系数在0．93～1．00之间。美人蕉和旱伞草的相关性不高，植株重一根重和分蘖数一根体积的相关系数在0．43～0．69之间．植物根系向下穿透基质的时候，一方面可起到一定的疏通作用，使基质孔隙率提高3％～44％；另一方面则会在穿透过程中产生横向的压力，起到使基质断面孔隙大小均一化的作用，使Peelet准数提高6％～90％。没有发现水质净化与分蘖数（地上植株重量）以及根系体积的规律性关系。植物对水质净化的作用不大，可以起到一定的但非决定性的防堵塞效果。
In order to investigate the influence of plant root on hydrodynamics and wastewater purifica- tion in vertical down flow wetlands, four kinds of plants with different characteristics of root distribu- tion, namely reed, cannaceac, Cyperus alternifolius L and rush （Juncus effusus L） are studied. By deducing the filleting process of these plants via Logistic function, it is concluded that there is no use to control the initial planting density in the wetland, because the plant biomass will finally rise to the habitat＇s maximum value. Overall, plant filleting and root development has a positive correlation, a case in point is reed and Juncus effusus L, of which the association coefficients between above-ground plant weight and root weight, as well as plant tillering and root volume are 0.93--1.00. The correlation of Cannaceac and Cyperus alternifoliusL is not so good, coefficient of them is just in the range of 0. 43-0. 69. While penetrating the substrate, root can open up the clogged soil to increase the porosi- ty of substrate by 3 % -44 %. At the same time, the coinstantaneous transverse pressure will homogenize the substrate, which increases Peclet number of substrate by 6 % -90 %. No regular correlation is found between pollutants removal and plant tillering, above-ground plant biomass or root volume. In a word, plant plays fewer roles in wastewater purification process, but when it comes to anti-clogging, plant＇s function is positive but not critical
出处
《同济大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2008年第4期519-524,共6页
Journal of Tongji University:Natural Science
基金
上海市科学技术委员会攻关资助项目(06dz12311)
上海市博士后科研资助计划资助项目(05R214141)
关键词
人工湿地
垂直流
植物分蘖
水力条件
constructed wetland
vertical down flow
plant tillering
substrate hydraulic conditions
