Study On Adaptability Of Tree Species In Landscape Improvement Of Aeolian Sandy Soil

The landscape of Aeolian Sandy land in China is poor,and the selection of landscape tree species is few.With the construction of ecological civilization and the development of landscaping,the people of the quality of Human Settlements and Leisure and entertainment environment has become more and more demanding.It is an important means to improve the survival rate of landscape tree species and optimize the early growth of Aeolian Sandy soil.In this paper,Aeolian Sandy soil was used as control group and 10%peat soil?T₁?and 20%peat soil?T₂?were added to Aeolian Sandy soil?T₀?as experimental group,through the combination of Principal Component Analysis?PCA?and membership function,a comprehensive analysis of multiple indicators was carried out,the adaptability of Morus alba,Xanthocera sorbifolia,Acer truncatum,Rhus typhina and Amorpha fruticosa planted in Aeolian Sandy soil was studied,and the suitable soil improvement methods of five landscape tree species were selected.The results are as follows:?1?Adding peat soil to Morus alba,Xanthocera sorbifolia,Acer truncatum Maxim,Rhus typhina and Amorpha fruticosa could promote the photosynthetic parameters,chlorophyll fluorescence,photosynthetic pigments and other physiological indexes,it can increase the beauty degree and landscape diversity of the Aeolian Sandy land area.After adding peat soil,the photosynthetic parameters and chlorophyll content of Acer truncatum were increased most significantly,267.2%and 55.71%higher in T₂than in T₀.At the same time,the anthocyanin content of Acer truncatum and Rhus typhina also increased with the increase of peat soil content.The colorful foliage breaks the traditional sense that landscape plants are green and promotes the ornamental qualities of the sandy areas.The change of Anthocyanin content of Acer truncatum was the most significant,and T₁treatment increased156%compared with T₀treatment.?2?Adding peat soil to Morus alba,Xanthocera sorbifolia,Acer truncatum,Rhus typhina and Amorpha fruticosa could promote leaf biomass,root biomass,growth amount and crown width,and increase the green coverage area in the sandy area.But the survival rate of Morus alba,Xanthocera sorbifolia,Acer truncatum Maxim and Amorpha fruticosa was not significantly affected by adding peat soil,and the survival rate of Rhus typhina increased gradually with the increase of peat soil content,from 62.5%to 100%.After adding peat soil,the leaf biomass of Rhus typhina,the root biomass of Morus alba,the height of trees and crown width of Acer truncatum changed the most obviously,compared with T₀treatment,T₂treatment increased by 313.42%,337.44%,342.86%and 134.81%,respectively.?3?Through principal component analysis,three comprehensive indicators are obtained,the contribution rate of which is 59.93%,22.3%and 17.22%respectively,and the weight is 0.6,0.22 and 0.17 respectively.The adaptability of different tree species can be ranked according to the value of comprehensive adaptability evaluation,and the degree of adaptability is as follows:Acer truncatum>Rhus typhina>Morus alba>Amorpha fruticosa>Xanthoceras sorbifolia.According to the research of this experiment,20%peat soil should be recommended to plant every tree species when the funds allow.The adaptability of Acer truncatum is the strongest,followed by Rhus typhina and Morus alba.In the absence of funds,10%peat soil could be added for Amorpha fruticosa,as there was no significant difference between 10%peat and 20%peat.Xanthoceras sorbifolia has weak adaptability,but it can survive under improved soil.