首页 | 官方网站   微博 | 高级检索  
     

微根管法监测膜下滴灌棉花根系生长动态
引用本文:陈文岭,靳孟贵,刘延锋,鲜阳,黄金瓯.微根管法监测膜下滴灌棉花根系生长动态[J].农业工程学报,2017,33(2):87-93.
作者姓名:陈文岭  靳孟贵  刘延锋  鲜阳  黄金瓯
作者单位:1. 中国地质大学盆地水文过程与湿地生态恢复学术创新基地,武汉 430074; 中国地质大学环境学院,武汉 430074;2. 中国地质大学环境学院,武汉,430074;3. 中国地质大学环境学院,武汉 430074; 浙江省地质环境监测院,杭州 310007
基金项目:国家自然科学基金项目(41172218; U1403282)
摘    要:为了精细监测膜下滴灌条件下棉花(Gossypium hirsutum L.)细根生长形态,于2014年在巴州灌溉试验站开展大田试验,采用微根管法原位监测棉花根系生长,并与传统网格法作对比。分析棉花根系生长动态,构建微根管法测定的形态参数与网格法所测定形态参数的回归模型。结果表明:花期到吐絮期,利用微根管监测10~20 cm处根系生长得到的棉花根长更新速率为1.844 mm/d,期间棉花老根不断死亡和分解。微根管法与网格法测得的根系深度为50 cm,根长密度随着深度增加先增大后减少,根长密度在20~30 cm处最大。两种方法监测得的根长密度具有较好的线性相关,由微根管法测得的剖面根长密度,可通过线性回归方程换算得到实际的体积根长密度。利用微根管法能可靠地监测棉花根系的生长动态变化,今后的研究可进一步加大微根管监测范围和频率,精细监测细根生长全过程,通过构建根系生长模型分析膜下滴灌条件下棉花根系生长时空动态。

关 键 词:棉花  生长  监测  细根  微根管法  网格法  根长密度  根系生长动态
收稿时间:2016/5/26 0:00:00
修稿时间:2016/11/25 0:00:00

Monitoring cotton root growth dynamics under mulched drip irrigation using monirhizotron technique
Chen Wenling,Jin Menggui,Liu Yanfeng,Xian Yang and Huang Jinou.Monitoring cotton root growth dynamics under mulched drip irrigation using monirhizotron technique[J].Transactions of the Chinese Society of Agricultural Engineering,2017,33(2):87-93.
Authors:Chen Wenling  Jin Menggui  Liu Yanfeng  Xian Yang and Huang Jinou
Affiliation:1. Laboratory of Basin Hydrology and Wetland Eco-restoration, China University of Geosciences, Wuhan 430074, China; 2. School of Environment Studies, China University of Geosciences, Wuhan 430074, China;,1. Laboratory of Basin Hydrology and Wetland Eco-restoration, China University of Geosciences, Wuhan 430074, China; 2. School of Environment Studies, China University of Geosciences, Wuhan 430074, China;,2. School of Environment Studies, China University of Geosciences, Wuhan 430074, China;,1. Laboratory of Basin Hydrology and Wetland Eco-restoration, China University of Geosciences, Wuhan 430074, China; 2. School of Environment Studies, China University of Geosciences, Wuhan 430074, China; and 2. School of Environment Studies, China University of Geosciences, Wuhan 430074, China; 3. Zhejiang Institute of Geo-environment Monitoring, Hangzhou 310007, China;
Abstract:Abstract: Fine roots are the most important and active part of the root system. Due to the inaccessibility of root systems, special techniques are required to investigate the fine root distribution and root growth parameters. Conventional method to study the root system such as the quadrate monolith method always consume large labors, cause destruction to the root system, can''t monitor the root growth in suit and will cause the error of the measurement. While minirhizotron technique provides a nondestructive, in situ method for viewing roots growth images and is one of the best tools available for directly studying root system. In order to meticulously investigate the growth dynamic of cotton fine root under film mulch drip irrigation, a field experiment was conducted in 2014 by using minirhizotron technique to measure the growth of cotton root in situ at the Bazhou Experimental Station in Korla, Xinjiang, China. Reference standard used in this experiment was quadrate monolith method. The minirhizotron and quadrate monolith methods were applied to analysis the growth of cotton root under mulched drip irrigation with fresh water, and the root growth parameters of the two methods were analyzed to establish a regression model. Results showed that, the cotton new root and dying root could be judged by the colour of root from the root images, and the variation parameters of length and diameter of cotton new root and dying root can also be directly estimated from the cotton root growth images collected from one of the minirhizotron tubes at the depth of 10-20 cm. The cotton new root growth turn over at the depth of 10-20 cm was 1.844 mm/d with minirhizntron method, more and more root turned to be dying root as time gone on in the periods of blooming stage to boll opening stage. The parameters of mean diameter, total projection area and total surface area of cotton new root increased with time increasing, while those parameters of dying root decreased with time increasing. The deepest growth of cotton root in soil was observed at 50 cm through the two methods. The total root length density determined by using minirhizotron technique in the blooming stage (08-07), boll stage (08-17 and 08-27), and boll opening stage (09-06) were 5.49, 5.90, 5.59 and 4.49 cm/cm2 respectively. The total root length density determined by quadrate monolith method in the blooming stage (07-16), boll stage (08-17) and boll opening stage (09-06) were 3.29, 5.14 and 5.78 cm/cm3 respectively. The distributions of cotton root length density at different depth of soil were the same observed through the two methods, root length density was increased with the increase of soil depth between 0-30 cm, the maximum root length density was observed at the depth of 20-30 cm, root length density was decreased with the increase of soil depth between 30-50 cm. The results of the root length density among two methods were significant correlation at 0.99 confidence level. The equation of linear regression could be used to estimate the actual root length growth parameter after we acquired the root length growth parameter with minirhizotron method. It further showed that the minirhizotron technique could provid as a reliable, nondestructive and in suit method for directly viewing and studied the growth of cotton fine root change within soil under mulched drip irrigation, and by using the root processing software (WinRHIZOTron MF 2012) we could easily acquire the root parameters after collected the root growth images. For better understanding the meticulous growth dynamic of cotton fine root, steps must be taken to insure good soil/minirhizotron tubes contact without disturbing the soil; increasing the monitoring scope and the frequency of cotton root growth images collection through different periods of cotton growth will be needed in further research.
Keywords:cotton  growth  monitoring  fine root  monirhizotron  quadrate monolith method  root length density  root growth dynamic
本文献已被 CNKI 万方数据 等数据库收录!
点击此处可从《农业工程学报》浏览原始摘要信息
点击此处可从《农业工程学报》下载全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司    京ICP备09084417号-23

京公网安备 11010802026262号