干旱地区农业研究2018，Vol.36Issue(1)：156-163,8.DOI:10.7606/j.issn.1000-7601.2018.01.24
东北春玉米不同发育期干旱胁迫对根系生长的影响
Effects of drought stresses during key growth periods on root growth of spring maize in Northeast China
摘要
Abstract
To investigate the effects of drought stress during growing periods on root distribution(RD)of spring maize during the jointing(BJ)and tasseling(CX)stages of maize,the root length densities(RLDs)at different soil depths during the corresponding growth periods were dynamically measured with the minirhizotron method,and the pa-rameters d50and d95related to RD representing respectively the soil depths where cumulative root fraction are 50% and 95% were simulated using root distribution model,and then spatio-temporal characteristics of soil relative water contents (SWC),RDs and theirs parameters were analyzed.The results showed that after water stress,actual SWC was basically consistent with the expectant condition though there were some differences between the two.More specifically,the SWC above the soil depth of 130 cm basically achieved the intended result,that is,the SWCs above the soil depth of 100 cm for the BJ and CX treatments were respectively below 40%.Conversely,the SWCs in the deeper soil layers were not im-pacted by water stress and still kept suitable soil water conditions.In addition,the maximums of RLDs were 1.24 ± 0.77 cm·cm-3at the depth of 40 cm for the CK treatment and 2.18 ± 0.89 cm·cm-3and 2.10 ± 0.47 cm·cm-3at the depth of 60 cm for the BJ and CX treatments,respectively.Below the depth of the maximum RLD,the RLDs for the CK and BJ treatments decreased with the increasing soil depth and the RLD for CX treatment kept a larger value below the soil depth of 80 cm.Furthermore,the d50,d95for BJ and CX treatments were 45% and 59%,8% and 41% larger than those of the CK treatment respectively,which proved that the maize root will grow to deeper soil layers when suffering drought stress relative to normal condition.In conclusion,this study can offer a reference for optimizing the root water uptake parameterization schemes in land surface,ecological and crop growth models.关键词
东北春玉米/干旱胁迫/根系分布/拔节期/抽雄期/根长密度Key words
spring maize in northeast China/drought stress/root distribution/jointing stage/tasseling stage/root length density分类
农业科技引用本文复制引用
陈鹏狮,纪瑞鹏,谢艳兵,史奎桥,杨扬,张慧,蔡福..东北春玉米不同发育期干旱胁迫对根系生长的影响[J].干旱地区农业研究,2018,36(1):156-163,8.基金项目
国家自然科学基金项目(41775110) （41775110）
辽宁省气象局博士启动项目(D201504) （D201504）
辽宁省农业领域青年科技创新人才培养计划项目(2015060) （2015060）
