Phyllostachys edulis stand structure optimization method based on minimum entropy

Abstract

The invention discloses a phyllostachys edulis stand structure optimization method based on minimum entropy. The method comprises the following steps: respectively optimizing a phyllostachys edulis stand structure by adopting a constrained nonlinear model and a real stand structure adjustment mode; and comprising the optimization results of the two optimization modes. According to the constrainednonlinear model optimization mode, a minimum entropy breast-height diameter structure optimization model and an age structure optimization model are constructed, the models are optimized and solved, and an optimization result of the breast-height diameter structure and the age structure of the phyllostachys edulis forest stand is obtained; according to the real stand structure adjustment and optimization method, comprehensive structure adjustment is performed on phyllostachys edulis of each age level and each diameter level in a felling mode through the statistical table of age levels and diameter levels in combination with the actual situation of the phyllostachys edulis stands, and the optimization result of the diameter at breast-height and the age structure of the phyllostachys edulisstands is obtained. The method has the advantages that the structure of the phyllostachys edulis stand is optimized by using a constrained nonlinear model and a real stand structure adjustment mode, enlightenment is provided for the operation of the phyllostachys edulis stand, and the productivity of phyllostachys edulis is improved.

Description

Technical field [0001] The invention relates to a method for optimizing the forest stand structure of Phyllostachys pubescens, in particular to a method for optimizing the stand structure of Phyllostachys pubescens based on minimum entropy. Background technique [0002] Phyllostachys pubescens is an important forest type in southern my country, as well as the most important and typical bamboo forest resource type. my country is one of the countries with the richest bamboo forest resources. According to the results of the 8th National Forest Resources Continuous Inventory, my country’s bamboo forest area is 600 Million hm 2 , my country is the main producing country of moso bamboo, the area of ​​moso bamboo forest is 4.43 million ha 2 Its area accounts for about 70% of the total area of ​​bamboo forests in the country. Moso bamboo has the characteristics of fast growth, high yield, wide use, and short cycle. It is an important food and economic source for bamboo farmers in mountaino...

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Problems solved by technology

[0005] At present, the research on stand structure optimization includes Chen Shuanglin optimized the stand structure model of bamboo shoot forest, and obtained the high-yield stand structure model of bamboo shoot forest through optimization (Chen Shuanglin, 2005); The stand structure of dual-purpose forests was optimized, and by adopting different stand structure combinations, the aim was to explore the high yield and high-quality bamboo seedlings of both shoot and seedling dual-use bamboo forests (Chen Shuanglin, 2003). Zhu Jinmao et al. According to research on the structure, the proportion of each age class is 1 age class: 2 age classes: 3 age classes: 4 age classes: 30:30:30:10 or similar, which can help improve forest productivity (Zhu Jinmao, 2000), Liu Enbin et al. established nonlinear constraint equations to study the non-spatial structure of moso bamboo forests, and believed that l age class: 2 age class: 3 age class: 4 age class is 1:1:1:1, N=4363 (plant / hm -2 ), D g = 12.1691 (cm), the carbon storage of Moso bamboo stands reaches the maximum (Liu Enbin, 2012), Hao, Q established a stand structure optimization model, and obtained the best stand structure of large-diameter trees (Hao, Q, 2006) , Jin, X built a multifunctional optimization model for wood production, seed production and carbon storage, the purpose of which is to study the optimal rotation period to maximize the multiple benefits of Korean pine forests (Jin, X, 2017), Hof J et al. However, the management objective of the model is still timber harvesting, and the impact of logging on forest structure is not considered too much (Hof J, 2000). The existing reports are all established under the predetermined objectives. Constraint conditions or experimental design to optimize the stand structure, and in order to study the optimality of the stand state, in fact, only when the state of a system is optimal can a system maintain vigorous vitality, and its development can be more durable and sustainable. Entropy is a quantity that describes the degree of chaos of the system state. The smaller the entropy, the more orderly the system state. Therefore, how to use the minimum entropy to study the optimal stand structure of Moso bamboo is the general direction of the research and development of stand structure optimization.

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