Abstract:

To realize close-to-nature transformation of plantations, in the paper, with the Pinus sylvestris var. mongolica plantations in Mao'ershan as the research object, and from the viewpoint of forest spatial structure optimization and methods of forest visualization simulation were studied, and the model of spatial structure optimization for Pinus sylvestris var. mongolica plantations, which was based on the basis of the general rule of forest succession, was developed on spatial structure parameters, i. e. mingling degree(M), neighborhood comparison (U) and uniform angle (W) index. Then three-dimensional(3-D)visualization management simulation system of Pinus sylvestris var. mongolica plantations was established by combining the model of spatial structure optimization with the model of stand visualization simulation organically. The results of simulation examples showed that the mean value of uniform angle index turned into 0.487 from 0.461, indicating the stand structure was changed from uniform distribution to random distribution. And the mean values of mingling degree was raised from 0.284 to 0.308, improving the mingling degree. Meanwhile, the mean values of neighborhood comparison from 0.515 to 0.481, the advantage degree of individual tree growth was improved. The forest spatial structure are optimized after the cutting which based on stand spatial structure. The system can achieve the simulation of forest management process in virtual forest environment, evaluate and optimize forest management plan, and predict future growth condition of stands, as well as, the influence of forest management activities on the forest conditions, etc so it was possible to offer a new platform for forest resource scientific management and business.

Key words: Pinus sylvestris var. mongolica plantation, spatial structure optimization, forest management, visualization