摘要
针对菜田灌溉水肥渗漏问题,采用田间试验和室内分析相结合,研究不同灌溉方式下日光温室番茄不同生育期根系垂直分布特征,在此基础上,进一步研究了膜下沟灌方式下不同灌水量番茄田土体水分的垂直分布特征及灌水量与土壤水在根层外渗漏的关系。结果表明,日光温室番茄主要根系层为0～40cm,最深根层为60cm。在灌水量7.5～22.5mm范围,灌溉后番茄田不同土层水分增加量呈垂直递减;在灌水量7.5～45mm范围,灌溉水根层外的渗漏率与灌水量呈线性相关;该文以满足根层水分有效供给和控制根层外渗漏为目标,确定日光温室番茄花果期和采收期适宜每次灌水量为15～22.5mm。研究结果可为确定浅根性蔬菜根-水同位管理灌溉指标提供依据。
Aimed at the problems of water and fertilizer leakage that induced by irrigation in vegetable field,root distribution under three irrigation methods and soil water dynamics and leakage from root intensive layers under different irrigation amount water supply were studied by combination of the field experiments and laboratory analysis in tomato field in greenhouse.The results show that the root intensive layer of tomato is the 0-40 cm,the deepest root level is 60 cm.Within the range of 7.5-22.5 mm irrigation water supply,the water distribution decreases progressively along the depth of the soil.Meanwhile,within the range of 7.5-45 mm irrigation water supply,the relationship between irrigation supply and soil water leakage from the intensive root layers has linear correlation.As a result,the indicated parameter is identified in 15.0-22.5 mm for irrigation water leakage control in tomato flowering,fruiting and harvest period.The index can provide reference for integrated management of the root-water-fertilizer system of shallow rooted vegetables.
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2010年第10期83-89,共7页
Transactions of the Chinese Society of Agricultural Engineering
基金
国家科技支撑计划(2007BAD69B06
2009BADA3B03)
石家庄市科技支撑计划(08149402A)
河北省财政专项(2009040001)资助
关键词
灌溉
渗漏
温室
控制
灌水量指标
番茄
irrigation
leakage
greenhouses
control
irrigation index
tomato
