Soil water regime and evapotranspiration of sites with trees and lawn in Moscow.

摘要: Keywords: Urban vegetation, Tilia cordata, linden, lawn, grass, Leaf Area Index, LAI, digital image processing, evapotranspiration, water stress, electric conductivity, salinity Makkink’s radiation model, deep percolation, infiltration, runoff, modelling Situations where tree groups of the species cordata grow together with lawn grass (trees overlapping grass) were studied on five locations in Moscow, Russia, during six periods growing season 2004. The measurements included: detailed descriptions soil profiles, and dimensions, and, for each period, leaf area index (LAI), content, conductivity (EC). LAI was determined through taking photos a camera processing program. Using weather data vegetation values potential evapotranspiration combinations calculated. These calculations followed FAO guidelines computing crop requirements. reference also calculated according to model. results resembled reference. measured content used identify sites reduced due stress. It appeared that incidence stress very common. transformed into ratios actual evapotranspiration: so-called factors. these factors, from values. regimes object period analysed. Deep percolation occurred early spring late autumn. possibilities rainwater infiltrate limited, degeneration structure. balance root zones indicated root-zone volumes smaller than average forest conditions, runoff extremely high.