Abstract:

In order to propose the most economical and reasonable irrigation methods in the garden, the effect of soil water stress on the physiology of Sophora japonica ‘Golden stem’ was studied. The fluorescence and photosynthetic parameters of the plant were detected with the portable photosynthesis system Licor6400. The sugar content was measured by Antrone Chromametry Assay Method. The content of malondialdehyde (MAD) levels in the leaves was detected with the chemical reaction of MAD and thiobaribituric acid (TBA). The results showed that the growths of the plants were suppressed after treated with flooding for 15 days, which was embodied in the decreasing of qP, ETR, Fv’/Fm’ and the content of pigment, the increasing of the content of MDA, the content of soluble sugar and qN. The growth and appearance of plants were suppressed after flooded for 23 days. The drought stress suppressed the growth of plants, which was embodied in the decreasing of qP, ETR, Fv’/Fm’, the content of pigment, the water content of leaves, the increasing of the content of MDA, the content of soluble sugar, qN after treated for 19 days. The qP, ETR, content of pigment and content of soluble sugar were increased after treated with Slight Drought or Middle Drought for 19 days. However, the Fv’/Fm’ of moderate drought group had a little decrease. The best irrigation method in the landscape and architecture was the content of water in the soil between 18% and 30%, which did not affect the growth or landscape effects. The water content in the soil diurnal variation between 8% and 18% was middle drought stress, which was not the bottom line of affecting the ornamental of S. japonica ‘Golden stem’. The water content in the soil content below 8% would make a serious impact on the growth and ornamental of S. japonica ‘Golden stem’. The application of S. japonica ‘Golden stem’ in the landscape and architecture should be avoided in the place which would be flooded for more than 15 days.