Study On Adaptability And Cultivation Technique Of Castanopsis Fissa

The large-scale cultivation of eucalyptus forests in Guangxi has a series of ecological problems.Castanopsis fssa is a potential substitute tree or mixed tree species of Eucalyptus robusta.In order to understand the adaptability of Castanopsis fissa in Guangxi,master its cultivation techniques,and provide a theoretical basis for the large-scale introduction of Eucalyptus grandis.In this paper,a test site was set up in the Gaofeng forest farm in Nanning,Guangxi,observing the growth,low temperature adaptability and cultivation techniques of Castanopsis fissa,the main conclusions are as follows:1.After the introduction of Castanopsis fissa in the Gaofeng forest farm,the growth is great and the survival rate is high.The phenological phase is late,It begins to sprout in early March,and leaves on April 10th.The flowering period is mid-May,the fruit ripening period is early October,and the defoliation period is around November 6 or so.Castanopsis fissa is a certain speed and abundance tree.After 4 years of planting,the average annual growth of trees is 1.16 m to 1.54 m.4 years of total breast diameter growth of 7.56cm.2.The survival rate of Castanopsis fissa is higher in winter and has a certain tolerance to low temperature.After 4 years of investigation on the wintering situation of Castanopsis fissa,the survival rate is over 93%.The older the seedling age,the higher the survival rate in winter.3.The seeds of Castanopsis fissa are not suitable for long-term storage.The storage time of seeds is preferably not more than half a year,and the longest is not more than one year.The indoor germination rate of wet sand is the highest,and it is immersed in warm water for 1-2 days before sowing.4.The mulching treatment of the planting sorghum of Castanopsis fissa is beneficial to the improvement of germination rate and the growth of seedlings and seedling height.At the same time,it can increase the soil water content,increase the soil temperature,and cause the seeds to germinate in advance.After the film is coated,the soil is loose and the weeds are difficult to grow,which reduces the maintenance management of the seedling stage.5.The growth of Castanopsis fissa seedlings after fertilization treatment was significantly better than no fertilization.The effect of fertilization treatment on the high growth of Castanopsis fissa seedlings reached a very significant level.And the application rate of various factors?N,P,K?also reached a significant level on the growth of Eucalyptus urophylla seedlings.The best fertilization combinations are N₃P₃K₄?N₃P₄K₃?N₃P₃P₃?and N_P3K₄.6.In the different planting density treatment experiments,the tree height,DBH and single-crop volume of density 1 were the best,but the average aunit of area was lower.The average average aunit of area of density 2 is the highest?1.8134m³/mu?,the lowest is density 4?1.1882m³/mu?.The effects of different planting densities on the tree height,DBH and single-soil volume of Castanopsis fissa were significantly different,and the differences in individual plant volume between the densities reached extremely significant levels.The experiment shows that the best planting density is 2m*4m.7.The common diseases of Castanopsis fissa are Rhizoctonia solani Kuhn,Pestalotia parasiticus?Linn?Mer.etc.The main pests are Buzura suppressaria?Guen?.Lymantri,and Anomala cupripes Hope.etc.