Analysis on the influencing factors of forest natural regeneration in northern China

Abstract

The purpose of this paper is to clarify that the differences in natural regeneration between the two forests in northern China are caused by precipitation, altitude, temperature, and canopy density. Similarly, the regeneration ability is related to the composition of tree species in the forest. Generally, the growth trend of a hardwood forest is not as good as that of a conifer forest in the northern cold area. At the same time, we also explored the possibility of human disturbance in forests. Due to the different geographical locations of the two forests, the human disturbance of Tuoketuo forest farm is more serious, which is also one of the reasons for the weak forest regeneration ability. By comparing the natural regeneration data of Guandi mountain and the natural regeneration data of Tuoketuo Forest Farm collected by previous scholars, the results showed that: (1) there were 17 seedlings and 44 saplings in ten Guandishan 20 m × 20 m square sampling plots. 9 plot has the highest regeneration density was 250 stems/ ha which canopy density was 0.25. When canopy density higher than 0.25, the regeneration density decreased significantly with the increase of canopy density; when canopy density higher than 0.80, there was no regeneration. (2) Four 1 × 1 (m) (1 m2) small plots were set in 2 × 2 (m2) plant plots to examine the natural regeneration frequency of Tuoketuo county. The total area of regeneration is 10756.8 ha, the total number of regeneration plants is 236650 stems, and the average number of regeneration stems per hectare was only 22 stems. (3) The regeneration quantity of young forest and seedling in Guandishan mountain forest is more. Light, altitude, and other factors were the main factors affecting the regeneration of Larix principis-rupprechtii Mayr on Guandishan Mountain. The forest in Tuoketuo county is not only affected by stand structure, site conditions, climate and other natural conditions but also affected by human disturbance.