GROWTH AND INCREMENT MODEL OF PLANTED FOREST Pinus masoniana Lamb IN CAO LOC DISTRICT, LANG SON PROVINCE
Keywords:
Growth, increment, planted pinus forest of Pinus masoniana Lamb, forest business, Lang SonAbstract
Forest growth is a continuously changing process and is influenced by all internal and external factors. Modeling planted forest growth using mathematical equations is always considered an important task in research as well as in current forestry production practices as a basis for determining technical measures (thinning, exploitation of forests,...) in forest business. Therefore, applying mathematical models to describe and analyze the changing of investigated factors (diameter, height, trunk volume, forest reserve, etc.) on individual trees and Forest stands over time are necessary. This article aims to evaluate growth and determine the amount of regular increment and periodic increment according to age using the standard tree method as a basis for predicting the main harvesting age for planted forest Pinus masoniana Lamb in Cao Loc district Lang Son province. Two growth functions, Schumacher and Gompertz, were used to describe the growth of stem diameter (D1,3), height (Hvn) and volume (V) for the research subjects. The equation chosen was the one with parameters exist in total, the largest coefficient of determination (R2max). The results show that growth and increment in terms of stem diameter (D1,3), height (Hvn) and volume (V) are well described by the Schumacher function with coefficients from R2 from 0.993 - 0.997, The growth equations have the form:
D = 15,26*exp(-5,43/A^1,12);
H = 11,03*exp(-4,67/A^1,09);
V = 0,52*exp(-9,95/A^0,58).
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Thông tư số 22/2021/TT-BNNPTNT của Bộ Nông nghiệp và Phát triển nông thôn: Quy định danh mục loài cây trồng lâm nghiệp chính; công nhận giống và nguồn giống cây trồng lâm nghiệp.
Quyết định số 375/QĐ-UBND, ngày 03/3/2022 Quyết định công bố hiện trạng rừng tỉnh Lạng Sơn năm 2021.
