闽南地区12年生土沉香人工林生长规律分析

Analysis about Growth Rehularity of 12-year-old Aquilaria sinensis Plantation in South Fujian

2023年,对福建省南安市12年生土沉香人工示范林进行调查,选择具有代表性的标准木进行树干解析,研究土沉香人工林的生长规律;并利用SPSS软件,采用不同模型对土沉香生长过程进行拟合。结果表明:12年生的土沉香人工林平均树高、胸径及单株去皮材积分别为10.90 m、16.73 cm及0.10359 m^(3);胸径、树高连年生长量分别在第5、6年达到最高值,而单株材积连年生长量最高值出现在第11年,树高、胸径及材积连年生长量曲线与平均生长量曲线未相交,说明树高、胸径及材积生长处于快速增长阶段,未达到数量成熟期;12年生的土沉香人工林径阶分布整体上呈现正态分布,林分结构比较合理。树高、胸径、材积拟合效果最佳的均为Richards模型,其相关系数R 2分别为0.9982、0.9982、0.9997,预测精度分别达到99.91%、99.91%、99.99%,拟合模型精度高,可用于生产实践预测,为土沉香人工林生产经营管理提供参考。

To study the growth regularity of 12-year-old Aquilaria sinensis plantation,this paper investigate about A.sinensis plantation and select representative stand trees for stem analysis in 2023 in Nanan City,Fujian Province.The results showed that the average diameter of height、DBH(without bark)and individual volume of 12-year-old trees reached 10.90 m、16.73 cm and 0.10359 m^(3)respectively.the annual increment of DBH(without bark)and height achieve the maximum value of 5-year and 6-year respectively,but the current annual increment of individual volume reached the highest point at the age of 11-year-old;the current annual increment curve and the mean annual increment curve of height、DBH(without bark)and individual volume is not intersection,which reflected that the trees is the high-speed growth stage of height、DBH(without bark)and individual volume and not reached numerical maturity.The radial distribution of 12-year-old A.sinensis plantation exhibited normal distribution,which showed that the plantation structure is high stability.The growth process of 12-year-old A.sinensis plantation using different models combined with SPSS statistical software is fitted,which showed that the best models of is Richards model.The correlation coefficient of height、DBH and individual volume by using Richards model is 0.9982、0.9982 and 0.9997 respectively,and the model had high prediction accuracy,which reached 99.91%、99.91%and 99.99%respectively.The Richards model had high precision can be used in production practice predictions,which has important guiding significance for using the production and operation management of A.sinensis.