Study on tree species allocation model of chestnut calcium soil in western Jilin Province
The purpose of this study is to select the most suitable afforestation model of economic tree species in chestnut soil area of western Jilin Province.Afforestation experiment was carried out in chestnut soil area by using 4 economic tree species[Armeniaca sibirica(L.)Lam.,Hippophae rhamnoides Linn.,Caragana Korshinskii.Kom.,Tamarix chinensis Lour.]and 6 planting patterns[Armeniaca sibirica(L.)Lam.×Hippophae rhamnoides Linn.,Armeniaca sibirica(L.)Lam.×Caragana Korshinskii.Kom.,Armeniaca sibirica(L.)Lam.×Tamarix chinensis Lour.,Tamarix chinensis Lour.×Hippophae rhamnoides Linn.,Tamarix chinensis Lour.×Caragana Korshinskii.Kom.,Hippophae rhamnoides Linn.×Caragana Korshinskii.Kom.].The survival rate and growth rate of forestation under different afforestation configuration in chestnut calcium soil area were analyzed.The results show that:There are some differences in the survival rate of different tree species under different models.The survival rate of Caragana Korshinskii.in model 5 and model 6 and Tamarix chinensis in model 4 was the highest,reaching 100%.The survival rate of Armeniaca sibirica(L.)Lam.in mode 2 was the lowest(54.5%).The survival rate of other allocation modes was above 64%,and the average survival rate of 4 species was above 82%.The average height,ground diameter and crown width of each species in different models increased with the increase of tree age.Most of the tree height,ground diameter and crown width of the same tree species in 2023 were significantly higher than those in 2022 under different afforestation models.Only the tree height of Tamarix chinensis Lour.in model 4 and the ground diameter of model 4 and Model 5 are not significantly different in 2022 and 2023.In terms of tree height,there was no significant difference between Armeniaca sibirica(L.)Lam.and Hippophae rhamnoides Linn.,Armeniaca sibirica(L.)Lam.and Caragana Korshinskii.Kom.,Hippophae rhamnoides Linn.and Caragana Korshinskii.Kom..In terms of ground diameter,there was no significant difference between Armeniaca sibirica(L.)Lam.and Caragana Korshinskii.Kom.,Armeniaca sibirica(L.)Lam.and Tamarix chinensis Lour..There was no significant difference between Hippophae rhamnoides Linn.and Tamarix chinensis Lour.,Armeniaca sibirica(L.)Lam.and Tamarix chinensis Lour.in crown width.Model 6(Hippophae rhamnoides Linn.×Caragana Korshinskii.Kom.)was the best afforestation model in chestnut calcium soil area,followed by model 5(Tamarix chinensis Lour.×Caragana Korshinskii.Kom.).These two models can not only ensure the survival rate and growth of seedlings,but also achieve mutual balance in the growth space.
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