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Han, Yanyun
- Algorithms of Thinning Simulation for Timber Plantation - a Case Study of Chinese Fir
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Authors
Affiliations
1 College of Information Science and Technology, Beijing Forestry University, Beijing, CN
1 College of Information Science and Technology, Beijing Forestry University, Beijing, CN
Source
Nature Environment and Pollution Technology, Vol 15, No 2 (2016), Pagination: 429-436Abstract
Thinning parameters, such as stand initial density, thinning time, number of thinning, thinning interval, intensity, and cutting age, were analyzed; constraints of these parameters were established. Based on these parameters, two algorithms were proposed. One algorithm was used to calculate volume harvest based on thinning parameters to determine the function of the predicted stand volume harvest via various thinning strategies. The other algorithm was used to develop an enumeration iterative algorithm based on the largest volume yield that can be obtained via an optimal thinning strategy. A decision support system of thinning simulation based on these algorithms was developed. Growth and yield models related to Chinese fir (Cunninghamia lanceolata (Lamb.) Hook.) were selected as research examples. When the initial stand was 4000 stems per hectare, site index was 16 meters and cutting age was 30 years, the Chinese fir stand can yield at most 906.74 m3/ha and 940.74 m3/ha if thinned once and twice with the corresponding and proposed thinning strategies, respectively.Keywords
Timber Plantation, Thinning Simulation, Forest Harvesting, Algorithms, Chinese Fir.Full Text
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- Study on Modelling of Site Quality Evaluation and its Dynamic Update Technology for Plantation Forests
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Authors
Affiliations
1 School of Information Science and Technology, Beijing Forestry University, Beijing 100083, CN
2 Key Laboratory for Silviculture and Conservation of Ministry of Education, Beijing Forestry University, Beijing 100083, CN
1 School of Information Science and Technology, Beijing Forestry University, Beijing 100083, CN
2 Key Laboratory for Silviculture and Conservation of Ministry of Education, Beijing Forestry University, Beijing 100083, CN
Source
Nature Environment and Pollution Technology, Vol 12, No 4 (2013), Pagination: 591-597Abstract
Differential site index models were constructed using both the algebraic difference approach (ADA) and the generalized algebraic difference approach (GADA) in this study to evaluate the site quality of forest land without the site index table. Data related to China fir (Cunninghamia lanceolata (Lamb.) Hook.) were selected to fit the differential site index models and then the optimal model was chosen. The optimal model was determined using an accuracy test and residual analysis, and then the dynamic update technique of the optimal model was studied by MATLAB and .NET. The results showed that Richards' differential site index model (SI = 19.171 × (Ht/19.171)ln(1-exp(-0.067×20))/ln(1-exp(-0.067 At))) had the best prediction performance. The ADA and GADA could be used to evaluate site quality without the site index table and the differential site index model could provide prompt dynamic updates.Keywords
Plantation Forests, Algebraic Difference Approach, Dynamic Update Technique, Richards’ Differential Site, Index Model.Full Text