| Camellia oleifera is the most important woody oil tree species in southern China.The use of woody edible oil industry such as Camellia oleifera in the hilly mountains of southern China is of great significance and significance for relieving the supply of edible vegetable oil in China and helping the poor poverty alleviation and rural revitalization in special poverty-stricken areas.In 2017,China's Camellia oleifera planting area reached 4.37 million hm2,and tea oil production per hectare was only 137kg.The reasons for the low yield of Camellia oleifera forests vary from country to country,and the measures for the transformation of low-yield forests are different.This paper relies on Longling County oil-tea low-yield forest reconstruction project,taking Longling County oil-tea low-yield forest as the research object,carrying out comprehensive rehabilitation,fertilization transformation,thinning transformation,grafting and crown change,cut-off retraction,pre-planting update,etc.The comparative experimental study on the low-yield forest transformation measures explored the transformation mode and related technical measures of the low-yield forest of Camellia oleifera suitable for the region,and provided scientific basis and technical support for the transformation of large-area Camellia oleifera forest in Longlin County.The main findings are as follows:(1)After the implementation of the six low-yield forest reconstruction measures,the order of the tree height from high to low is:comprehensive recovery,fertilization transformation,thinning transformation,grafting and crown replacement,cut-off retraction,pre-planting and renewal.The results of multiple comparisons showed that among the six low-yield forest transformation measures,the height of Camellia oleifera trees treated with comprehensive rehabilitation and fertilization was higher than that of the control group,but the difference was not significant;grafting and crown replacement,cut-off retraction,pre-planting and other transformation measures The tree high mean was significantly shorter than the control group.(2)The comprehensive rehabilitation and fertilization transformation had a significant effect on the increase of the crown of oil-tea.The north-south crown and the east-west crown were significantly larger than the control group.(3)The effects of various transformation measures on the fruit yield,tea seed yield and tea oil yield of Camellia oleifera were significantly higher than those of the control group.Among them,fertilization had the greatest impact on the yield increase,and the yield was significantly higher than other treatments except the comprehensive recovery.(4)Carrying out the membership function analysis of each growth index and yield of Camellia oleifera under different transformation measures,and comprehensively evaluating the growth and yield of Camellia oleifera in different treatment groups,the results showed the average value of the subordinates of different transformation measures group and the control group without modification.Invariably,the average values of the subordinates of each treatment group are ranked from large to small,respectively:fertilization transformation>comprehensive rehabilitation>cut-off retraction>pre-planting update>grafting replacement crown>CK>thinning transformation.It can be seen that the six low-reform measures can promote the growth and production of Camellia oleifera.Moreover,it can be seen from the comparison of each treatment group that fertilization has the greatest influence on the growth indexes and yield of Camellia oleifera forest. |
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