中国农业科学2012，Vol.45Issue(19)：4004-4013,10.DOI:10.3864/j.issn.0578-1752.2012.19.012
华北平原春玉米滴灌均匀系数对土壤水氮时空分布的影响
The Effects of Drip Irrigation Uniformity on Spatial and Temporal Distributions of Water and Nitrogen in Soil for Spring Maize in North China Plain
摘要
Abstract
[Objective] The objectives of this study were to investigate the effects of drip irrigation uniformity and soil properties on the spatial and temporal variability of water and nitrogen in the soil and to quantitatively evaluate the suitability of current design standard of drip irrigation uniformity. [Method! Field experiments were conducted on drip irrigated spring maize (Zea mays L.) in north China plain. Three Christiansen uniformity coefficients (CU) of 0.66 (low), 0.81 (medium), and 0.99 (high) and three levels of water application at 50%, 75%, and 100% of the irrigation requirement were used. Soil water and nitrogen content were periodically measured during the growing seasons of spring maize.[ ResultlThe result indicated that the uniformity coefficient of soil water content was higher than 0.85 in 2009 and higher than 0.80 in 2010. The low uniformity treatment did not produce a uniformity coefficient of soil water content that was significantly different from the medium and the high uniformity treatments. For the low uniformity treatment, the uniformity of soil water content was considerably higher than its irrigation uniformity (0.66). The influence of the uniformity of initiate soil water content was more important than the uniformity of water application and irrigation amount. Drip irrigation uniformity imposed an insignificant influence on the uniformity coefficients of nitrate content. [Conclusion] The results suggested that drip irrigation uniformity was not the main factor influencing the spatial and temporal variability of soil water and nitrogen for spring maize in the semi-humid regions such as the north China plain. The current design standard of drip irrigation uniformity coefficient (CU≥0.80) could be fairly lowered to reduce the initial cost of drip irrigation systems.关键词
滴灌/均匀系数/灌水量/春玉米/土壤含水量/硝态氮Key words
drip irrigation/uniformity coefficient/application amount/spring maize/soil water content/nitrate nitrogen引用本文复制引用
张航,李久生..华北平原春玉米滴灌均匀系数对土壤水氮时空分布的影响[J].中国农业科学,2012,45(19):4004-4013,10.基金项目
国家自然科学基金项目(50979115) （50979115）
