摘要
Abstract
By exploring the water retention effect of resin-based polymer water-retaining agents in garden green spaces,technical support is provided for the urban greening of Lanzhou City and the greening of the northern and southern mountains.Taking the widely used small shrubs,perennial root flowers,herbaceous flowers,and lawn plants in garden green spaces as the research objects,the influences of applying 150 kg/ha of water-retaining agent and 450 kg/ha of diammonium hydrogen phosphate on the growth status of garden plants,soil moisture content,leaf relative moisture content,relative water deficit,leaf water holding rate,and leaf relative conductivity were studied.Results showed that after the application of water-retaining agents,the plants growed vigorously and their stress resistance was enhanced.The crown width of herbaceous flower species increased significantly,and the average number of flowers per plant increased.The lawn germinated early and formed quickly.The branches of small shrubs were robust and the plant height increased significantly.The number of buds propagated by perennial root flowers increased significantly.With the extension of water control time,compared with the treatment without water-retaining agent,the soil moisture content with the application of water-retaining agent increased by 14.87%to 36.85%,the leaf relative moisture content(RWC)increased in all cases,especially for the herbaceous plants Zinnia elegans and ornamental grass,which increased by 6.19 and 7.20 percentage points,respectively.Under drought stress,the leaf water holding rate of the small shrub Rosa floribunda decreased significantly by 9.86 percentage points,and the Hemerocallis fulva of perennial root flowers was slightly lower than that of Rosa floribunda.The conductivity increased of the small shrub Ligustrum vicaryi was 25.01%,and the increase of the herbaceous plant Zinnia elegans was only 10.02%.It is indicated that the application of 150 kg/ha of water-retaining agent and 450 kg/ha of diammonium hydrogen phosphate in the soil is conducive to the growth and development of plants,can improve the drought resistance of plants and soil moisture content,alleviate the damage to plant tissues caused by drought stress and the degree of damage to plant leaf cell membranes,and the effect is more obvious in lawn plants.关键词
保水剂/园林植物/生长发育/生理指标Key words
Water-retaining agent/Garden plant/Growth and development/Physiological index分类
园艺学与植物营养学
