Growth process and model simulation of three different classes of Schima superba in a natural subtropical forest in China

International Conference on Energy Engineering and Environmental Protection 2016

能源学;生态环境科学

Wei, Hui^1 ; Deng, Xiangwen^1,2 ; Ouyang, Shuai^1,2 ; Chen, Lijun^3 ; Chu, Yonghe^3

Faculty of Life Science and Technology, Central South University of Forestry and Technology, Changsha

410018, China^1

National Engineering Laboratory for Applied Technology of Forestry and Ecology in South China, Changsha

410018, China^2

Forestry Bureau of JingZhou Miao and Dong Autonomous County, HuaiHua

418413, China^3

关键词: Current annual increments;    Diameter-at-breast heights;    Different class;    Fluctuation phenomena;    Mean annual increments;    Model simulation;    Root of mean squares;    Subtropical forests;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/52/1/012106/pdf
DOI  :  10.1088/1742-6596/52/1/012106

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Schima superba is an important fire-resistant, high-quality timber species in southern China. Growth in height, diameter at breast height (DBH), and volume of the three different classes (overtopped, average and dominant) of S. superba were examined in a natural subtropical forest. Four growth models (Richards, edited Weibull, Logistic and Gompertz) were selected to fit the growth of the three different classes of trees. The results showed that there was a fluctuation phenomenon in height and DBH current annual growth process of all three classes. Multiple intersections were found between current annual increment (CAI) and mean annual increment (MAI) curves of both height and DBH, but there was no intersection between volume CAI and MAI curves. All selected models could be used to fit the growth of the three classes of S. superba, with determinant coefficients above 0.9637. However, the edited Weibull model performed best with the highest R2and the lowest root of mean square error (RMSE). S. superba is a fast-growing tree with a higher growth rate during youth. The height and DBH CAIs of overtopped, average and dominant trees reached growth peaks at ages 5-10, 10-15 and 15-20 years, respectively. According to model simulation, the volume CAIs of overtopped, average and dominant trees reached growth peaks at ages 17, 55 and 76 years, respectively. The biological rotation ages of the overtopped, average and dominant trees of S. superba were 29, 85 and 128 years, respectively.