城市绿地节水灌溉的土壤水分诊断层研究  

Diagnostic Horizon of Soil Moisture Regime for Water-saving Irrigation in Urban Green Area

作　　者：袁大刚[1] 刘世全[1] 蒲光兰[2] 张金龙[3] 黄明勇[3] 

机构地区：[1]四川农业大学资源环境学院,四川雅安625014 [2]四川农业大学林学园艺学院,四川雅安625014 [3]天津泰达生态园林发展有限公司,天津开发区300457

出　　处：《土壤通报》2008年第5期982-985,共4页Chinese Journal of Soil Science

基　　金：天津市建委项目(99-32);四川农业大学青年科技创新基金项目(01430800)

摘　　要：在干旱、半干旱地区,水资源严重不足是城市绿化面临的瓶颈问题之一,节水灌溉必须依据土壤水分状况与植物生理状态进行。本文选取属于温带半干旱季风气候的天津开发区为研究区域,通过对本特草草坪、高羊茅草坪和泡桐行道树带3类城市绿地在一个生长周期内的土壤水分含量与相应的植物光合速率、蒸腾速率、气孔导度、气孔阻力等生理指标的原位试验资料之相关统计分析,提出"土壤水分诊断层"概念,即水分诊断层是气孔导度与土壤含水量呈极显著或显著相关且系数最高的土层;并对各绿地的土壤水分诊断层深度作了初步划分:本特草草坪为距地表20cm深度处土层,高羊茅草坪为距地表50cm深度处土层,泡桐绿地为距地表40cm深度处土层。由此可见,对于不同绿地类型,节水灌溉的水分诊断层具有差异性,建议实践中以诊断层含水量判断灌水时期,从而达到以较少的水资源实现城市绿地用水需求的目的。Water-saving irrigation must be based on soil moisture regimes and plant physiological status. In arid and sub-arid area, the non-abundant water resource is the basic problem in urban landscape. Tianjin TEDA was selected for water-saving irrigation trial. Based on the correlation analysis between plant physiological indexes and soil water contents of various layers of 3 types of green areas in situ, the concept diagnostic horizon of soil moisture regime was put forward and established for the green areas. Water-saving irrigation time must be selected according to the water content of diagnostic horizon of soil moisture regime, rather than that of scheming wetted soil layer.

关 键 词：土壤水分诊断层 气孔导度 节水灌溉 城市土壤 

分 类 号：S152.7[农业科学—土壤学]