摘要
以管栽玉米进行分根实验,在均匀灌水、固定部分根区灌水和根系分区交替灌水3种方式下,分期测定两个1/2根区及整个根区的土-根系统总水分传导(简称水导)、单位根面积和单位根长水导,研究局部灌水方式对玉米不同根区土-根系统水分传导的影响。结果表明:各阶段处理5d和10d时,总水导、单位根面积和单位根长水导一致表现为固定灌水和交替灌水的灌水区较之均匀灌水1/2根区均显著增大,说明局部灌水可以显著增强灌水区土-根系统水分传输的补偿效应。固定灌水时,灌水区水导始终显著大于非灌水区;交替灌水时,两个根区呈交替变化趋势。与固定灌水相比,交替灌水非灌水区的水分传导明显增大。因此,交替灌水能更好利用各部分根系资源以满足作物需水要求。
Effects of localized irrigation model on hydraulic conductivity in soil-root system for different root-zones of maize grown in split-root containers were analyzed. Three irrigation treatments, namely, conventional water irrigation treatment （C）, fixed partial root-zone irrigation treatment （F）, alterneative parial root-zone irrigation treatment （A）, were adopted hydraulic conductivity of whole and a half root-zone, and hydraulic conductivity per root area and per root length were studied. Results show that, compared with each half root-zone of the control, the hydraulic conductivity in soil-root system for irrigated root-zone under the A and F treatments increase significantly at both the 5th and the 10th days of each treatment. Localized irrigation can increase the compensatory effect of water transport in soil-root system. For F treatment, the hydraulic conductivity of the irrigated root-zone is always markedly higher than that of the non-irrigated root-zone. As for A treatment, the hydraulic conductivity of two root-zones alternatively changes. The hydraulic conductivity of the non-irrigated root-zone increases significantly for A treatment compared with F treatment. Alternative partial root-zone irrigation treatment can use all root system resources better to satisfy crop water requirement.
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2007年第2期11-16,共6页
Transactions of the Chinese Society of Agricultural Engineering
基金
国家自然科学基金重点项目(50339030)
"十五"国家节水农业重大专项(2002AA2Z4041)
陕西省自然科学基金(2006C106)
西北农林科技大学科研专项基金资助
关键词
局部灌水方式
不同根区
土-根系统水分传导
补偿效应
玉米
localized irrigation model
different root-zones
hydraulic conductivity in soil-root system
compensatory effect
maize
