Taking Prunus wilsonii as experimental material,by spraying 0,0.5,1.0,1.5,2.0 mmol/L SA solution respectively to the tested plants leaves,under artificial low-temperature stress,five physiological indexes anthocyanin content,free proline content,relative electrical conductivity,SOD content and MDA content were determined and the effects of exogenous salicylic acid on freezing resistance of Prunus wilsonii were studied.The results showed that the application of exogenous salicylic acid could inhibit the destructive effect of low temperature on anthocyanin,improve the activity of SOD enzyme,increase the content of free proline and reduce the content of MDA and the relative conductivity,thus weakening the damage of low temperature on Prunus wilsonii,improving freezing resistance of the Prunus wilsonii 1.0 mmol/L SA treatment was optimum.

Plant landscape for the green space of parks in Huludao city was investigated and analyzed.According to the plant information in Huludao city and the plant disposition materials at home and abroad,this paper discussed the characteristics of plant landscape for the green space of parks.The existing problems were summarized.The article draw meaningful conclusions as follows: tree species selection,community structure and plant disposition mode of green space are related to the park site conditions,ecology and landscape function.The green space of parks have the maximum of plant species and the most complicated ecological community.

The adaptability of Sedum lineare Thunb on the stone slope was studied in this article. Sedum lineare Thunb was planted on bare stone slope of the Qingyuan part of the Shen ji highway. The physiological indicators under drought stress, above-ground and underground biomass were determined, and the plant communities were investigated. The results showed that Sedum lineare Thunb expressed strong drought resistance through the three basic adversity physiological indicators. In aspects of ecological adaptability, the proportion of above-ground and underground biomass reached 12.15, and the value of SDR reached 50.32. So it is able to adapt to harsh conditions. Sedum lineare Thunb could be applied on the stone slope.

By results and indicators of the two experiments, this paper evaluated the effect of reinforcing embankment of Portulaca grandiflora, and compared the difference of effectiveness between the Portulaca grandiflora with seed propagation at this year and the Portulaca grandiflora with self-propagating at the following year.

Taking aquatic plants Monochoria korsakowii as materials,under the conditions of the nutrient solution containing,different concentrations of phenol and ammonia nitrogen on the growth of Monochoria korsakowii of the ground part and the underground part,and Monochoria korsakowii resistance uptake and accumulation of organic pollutants in water phenol and ammonia nitrogen were studied.The results showed that Monochoria korsakowii could grow in the sewage contains a certain concentration of phenol and ammonia nitrogen,and removal force of phenol and ammonia nitrogen was more considerable,the average removal rates respectively was 85.2% and 73.1%;while the enrichment coefficient for phenol of Monochoria korsakowii of the ground parts of the underground part respectively reached 9.58and 4.64,the largest accumulation of its nitrogen were 712.682mg and 498.815mg per plant.It showed Monochoria korsakowii could remove the phenol and ammonia nitrogen in the waste water and played a good role for purifying water.