Study On The Planting Model Of The Precious Tree Species In Nanning Arboretum

In this study,the method of field afforestation was used to test the Tsoongiodendron odorum,Dalberqia odorifera and Acrocarpus fraxinifolius.Each tree species was set up with three kinds of agriculture and forestry three-dimensional management mode,which were planted with Alpinia katsumadai,Caesalpinia sappan and a blank control,namely T1.Tsoongiodendron odorum+ Caesalpinia sappan,T2.Tsoongiodendron odorum+Alpinia katsumadai,T3.Tsoongiodendron odorum+ control,T4.Dalberqia odorifera+ Caesalpinia sappan,T5.Dalberqia odorifera + Alpinia katsumadai,T6.Dalberqia odorifera+ Control,T7.Acrocarpus fraxinifolius+ Caesalpinia sappan,T8.Acrocarpus fraxinifolius+ Alpinia katsumadai,T9.Acrocarpus fraxinifolius + control 9 modes Each model setting upper,middle and lower slope repeat.The plant height,Breast diameter,crown width and plant height,ground diameter,yield and soil physical and chemical indicators of the plantation were studied in each model.In order to provide a scientific basis for the rational management and management of the precious tree species of Nanning Orchard,it has an important practical guiding role for the comprehensive management and scientific management of precious tree species in Nanning.the result shows:(1)In the three precious tree species intercropping mode,the growth indicators in 2016,2015 and 2014 all showed downhill > mid slope > uphill.(2)From the different intercropping patterns of the same tree species,the growth indicators were followed by Tsoongiodendron odorum+Alpinia katsumadai>Tsoongiodendron odorum+ Caesalpinia sappan>Tsoongiodendron odorum+control;Dalberqia odorifera> Caesalpinia sappan> Dalberqiaodorifera+ Alpinia katsumadai> Dalberqia odorifera+ Control;Acrocarpus fraxinifolius>Acrocarpus fraxinifolius+ control> Acrocarpus fraxinifolius+Alpinia katsumadai.(3)Analysis of the two kinds of undergrowth plants can be obtained.In terms of Alpinia katsumadai,the growth index and yield of the three kinds of precious tree species are improved year by year.From the weight of a single fresh fruit,the performance is followed by the Dalberqia odorifera + Alpinia katsumadai=Acrocarpus fraxinifolius+Alpinia katsumadai> Tsoongiodendron odorum + Alpinia katsumadai;From the point of view of the rate of the kernel,the performance is followed by Tsoongiodendron odorum + Alpinia katsumadai>Dalberqia odorifera + Alpinia katsumadai> Acrocarpus fraxinifolius + Alpinia katsumadai;From the fresh fruit yield per unit area and the dry weight of nuts per unit area,the performance is followed by the Dalberqia odorifera+ Alpinia katsumadai> Tsoongiodendron odorum + Alpinia katsumadai >Acrocarpus fraxinifolius as far as Caesalpinia sappan is concerned,the average tree height,average ground diameter,average wood fresh weight,total dry weight,and unit area yield of Caesalpinia sappan are in turn descending from Dalberqia odorifera+Caesalpinia sappan> Tsoongiodendron odorum+Caesalpinia sappan>Acrocarpus fraxinifolius +Caesalpinia sappan.(4)Analysis of soil physical and chemical indicators can be obtained.Compared with 2014,the soil organic matter,total nitrogen,total phosphorus,total potassium,alkali nitrogen,available phosphorus and available potassium in2016 were all improved Tsoongiodendron odorum> Dalberqia odorifera>Acrocarpus fraxinifolius;The same precious tree species behaved as Alpinia katsumadai > Caesalpinia sappan.Comprehensive analysis and comparison shows that the three modes of Tsoongiodendron odorum+ Alpinia katsumadai,Dalberqia odorifera + Alpinia katsumadai,Acrocarpus fraxinifolius+ Caesalpinia sappan,are the best choice for downhill planting,which can provide realistic theoretical basis for realistic cultivation.