摘要
为进行河岸流域水陆交错带植被生长的可视化模拟研究,以漓江流域枫杨树种为模拟对象,基于改进的Hegyi简单竞争指数建立了枫杨树种的单木生长模型,通过将直径分布模型和随机算法运用于全林分,利用C#编程语言、3D Max建模工具、Virtools平台等可视化相关技术,实现了漓江流域枫杨树种在不同全氮含量土壤的生长可视化模拟。研究表明,枫杨胸径年生长量与土壤全氮含量呈显著正相关,相关系数为0.749;竞争指数模型改进前和改进后的竞争指数与胸径年增长量均呈显著负相关,相关系数分别为-0.621和-0.657;模拟过程中,拟合2块样地内枫杨径阶分布时误差率分别为6.25%和11.9%,枫杨树高与胸径模型拟合决定系数为0.703,冠幅与胸径模型拟合决定系数为0.612,枫杨胸径生长模型拟合决定系数为0.734。改进的竞争指数模型和随机算法对构建水陆交错带枫杨树种的生长模拟具有较强的适用性和较高的逼真度。该研究为漓江流域植被恢复和演替模拟提供理论依据和参考。
In recent years, the phenomenon of the landscape degradation in the river basin has been more and more serious because of over ecotourism, and the forestry visualization technology provides important reference for ecosystem restoration and landscape optimization decision, therefore, it is necessary and practically significant to research the visual simulation of vegetation growth in the river basin. This paper presented the case of pterocarya stenoptera in aquatic - terrestrial ecotones in Lijiang River, and found that total nitrogen content of soil plays a critical role during its growth after analyzing the correlation between soil sample and growth data. Based on this finding, the modified Hegyi＇ s simple competition index model with added nitrogen factors was adopted to the single tree growth model for pterocarya stenoptera stands built in Lijiang River, then diameter distribution model and random algorithm were applied to whole stand model. In the process of simulation, the information of location and diameter at breast height distribution of pterocarya stenoptera in the plot was confirmed by the trees distribution model first; the next step, the height and the crown of each pterocarya stenoptera were simulated according to the fitting relationship between tree height and diameter at breast height, crowns with diameter at breast height and the diameter at breast height of each pterocarya stenoptera were measured, and then, the growth of pterocarya stenoptera was simulated by iterative execution of the growth model using the data got before; after that two-dimensional simulation with different soil nitrogen contents was achieved by implementing C# programming language and GDI ＋ technology, and then the dot and the circle in two- dimensional simulation would be mapped into specific pterocarya stenoptera model on 3D Max; finally the three-dimensional visual simulation of the growth of pterocarya stenoptera in Virtools platform was achieved. The result showed that a significantly positively relationship exist
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2016年第9期301-308,共8页
Transactions of the Chinese Society for Agricultural Machinery
基金
"十二五"国家科技支撑计划项目(2012BAC16B03)
北京林业大学科技创新计划项目(YX2013-38)
关键词
枫杨
生长模型
水陆交错带
竞争指数
可视化
pterocarya stenoptera
growth model
aquatic - terrestrial ecotones
competition index
visualization
