干旱灌区冬小麦根系的生长冗余  

Growth redundancy of winter wheat root system in irrigated arid area

作　　者：侯慧芝[1] 黄高宝[2] 郭清毅[2] 王利立[2] 

机构地区：[1]甘肃农业大学资源与环境学院,兰州730070 [2]甘肃农业大学农学院,兰州730070

出　　处：《生态学杂志》2007年第9期1407-1411,共5页Chinese Journal of Ecology

基　　金：教育部博士点基金项目(20050733003);甘肃省科学技术攻关计划资助项目(2GS042-A41-002-01)

摘　　要：采用管栽试验通过人为去除根系的方法对甘肃河西绿洲灌区2个冬小麦品种根系的形态特征及根系与地上部分的关系进行了研究。结果表明:去除根系的冬小麦的前期生长受到一定程度的限制,与对照相比,其根冠比及其它根系指标均有所下降,且根系去除程度越大降低幅度越大;生长后期小麦根系出现了超补偿效应;成熟期,去除1/4根系和去除1/2根系处理的冬小麦无论是主茎还是分蘖的穗长、穗质量、穗粒数、粒质量等均比对照增加;但前者主茎各项指标的增幅较大,而后者分蘖的各项指标增幅较大。初步确定冬小麦在充分灌溉条件下至少有1/4的根系是冗余的。By the method of root hand-removal, a tube experiment was conducted to study the morphological characteristics of root system and the relationships between root system and aboveground part of two winter wheat varieties collected from Hexi irrigated area of Gansu Province. The results indicated that at earlier growth stage, the growth of the wheat varieties with their roots partly removed was inhibited to a certain extent. Compared with CK, the root/shoot ratio and other root indices of root-removed wheat were decreased, and more decrement was observed with the roots more removed. At latter growth stage, the overcompensation effect of root system occurred. For the varieties with their roots removed, the spike length, spike mass, grain number per spike, and grain mass on the main stem and tillers were bigger than CK, and the removal of 1/4 roots had more advantages to main stem, while 1/2 roots removal was more beneficial to tillers. It was considered that under adequate irrigation, at least 1/4 of winter wheat roots could be redundant.

关 键 词：干旱灌区 冬小麦 根系 生长冗余 超补偿效应 

分 类 号：S512.1[农业科学—作物学]