چکیده:
The management of forests may be motivated from production economic and
environmental perspectives. The dynamically changing properties of trees affect
environmental objectives and values of trees as raw material in the construction
sector and in the energy sector. In order to optimize the management of forests, it is
necessary to have access to reliable functions that predict how trees develop over
time. One central property of a tree is the basal area, the area of the stem segment
1.3 meters above ground. In this paper, a general dynamic function for the basal area
of individual trees has been developed from a production theoretically motivated
autonomous differential equation. A closed form solution is derived and analyzed.
Several examples of recent application of this function in Iran and Sweden are
reported.
خلاصه ماشینی:
"A General Dynamic Function for the Basal Area of Individual Trees Derived from a Production Theoretically Motivated Autonomous Differential Equation Peter Lohmander* Department of Management and Economic Optimization, Optimal Solutions in cooperation with Linnaeus University, Umea, Sweden (Received: June 17, 2017; Revised: December 8, 2017; Accepted: December 23, 2017) Abstract The management of forests may be motivated from production economic and environmental perspectives.
In this paper, a general dynamic function for the basal area of individual trees has been developed from a production theoretically motivated autonomous differential equation.
The theoretical gap can be formulated this way: Until now, dynamic forest management optimization has usually been studied via comparative statics analysis based on general function analysis (a), discrete time numerical optimization (b), or continuous time optimal control theory based on the logistic law of population growth (c) as described by Braun (1983).
In this paper, a general dynamic function for the basal area of individual trees will be derived from a production theoretically motivated autonomous differential equation.
Results A general dynamic function for the basal area of individual trees has been derived from a production theoretically motivated autonomous differential equation.
(2017) write: "This study investigates basal area increment of individual trees in mixed species continuous cover forests in the north of Iran.
(2017) use the differential equation developed in this paper as a part of a forest management optimization model and write: "The expected present value of all harvests, over time and space, in a forest area, is maximized."