Study On Shade-Tolerance And Application Of Six Garden Plants In Tianjin

Six representatives of garden plants were selected as reseach objects, undergoing different lights (4%, 25%, 70% and 100% sun-shading). These plant species were: Lonicera japnica, Sorbaria kirilowii, Euonymus kiautshovicus, Euonymus japonicus , Parthenocissus tricuspidata and Parthenocissus quinquerolia. The changes of leaf characters , chlorophyll content and the ratios of chlorophyll a to chlorophyll b and photosynthetic characters in leaves of the six garden plants were surveyed in this paper. Based on all indexes, comparative study on shade-tolerance and discuss on application of the six garden plants. The results show that:1. Different intensities of light have effect on leaf characters of six plants, especially on leaf area and specific leaf weight. With the increasing of sun-shading, the datas of leaf depth, specific leaf weight and stomatal density of all the six plants showed down, while the datas of fresh weight, leaf area and leaf water content showed up. Fresh weight and leave area of the six garden plants were on the highest point with proper sun-shading treatment. Such as the highest data of leaf area of Sorbaria kirilowii , Euonymus japonicus and Euonymus kiautshovicus were presented with 70% sun-shading treatment; the highest data of the two indexes of Lonicera japnica and the fresh weight of Sorbaria kirilowii, Euonymus japonicus, Euonymus kiautshovicus and Parthenocissus quinquerolia were presented with 25% sun-shading treatment; the highest data of leaf area of Parthenocissus quinquerolia and fresh weight of Parthenocissus quinquerolia were presented with 4% sun-shading treatment.2. With the increasing of sun-shading, the chlorophyll contents in leaves of all the six plants have increased and the ratios of chlorophyll a to chlorophyll b have decreased. According to...