地球信息科学学报 ›› 2012, Vol. 14 ›› Issue (5): 569-575.doi: 10.3724/SP.J.1047.2012.00569

• 本期要文(可全文下载) • 上一篇    下一篇

基于虚拟植物的幼龄杉木生长模拟

唐丽玉, 林定, 黄洪宇, 邹杰, 陈崇成, 杜云虎   

  1. 福州大学 空间数据挖掘与信息共享教育部重点实验室 福建省空间信息工程研究中心, 福州 350002
  • 收稿日期:2012-06-26 修回日期:2012-09-10 出版日期:2012-10-25 发布日期:2012-10-25
  • 作者简介:唐丽玉(1972-),女,福建人,博士, 副研究员,主要从事地学可视化与虚拟地理环境、虚拟植物方面的研究。E-mail: tangly@fzu.edu.cn
  • 基金资助:

    国家"863"计划课题(2012AA102002);国家自然科学基金项目(30972299,41001203);福建省产学研重大项目(2012N5006);福建省自然科学基金项目(2012J0505)。

Growth Simulation of Young Chinese Fir Based on Virtual Plant

TANG Liyu, LIN Ding, HUANG Hongyu, ZOU Jie, CHEN Chongcheng, DU Yunhu   

  1. Key Laboratory of Spatial Data Mining & Information Sharing of Ministry of Education, Spatial Information Research Center of Fujian Province, Fuzhou University, Fuzhou 350002, China
  • Received:2012-06-26 Revised:2012-09-10 Online:2012-10-25 Published:2012-10-25

摘要:

为估算树木在不同生长环境下的生长量及评价树木与环境之间的相互关系,本文以幼龄杉木为对象,从个体尺度上,根据形态结构生长发育规律,定义了幼龄杉木生长的基本单元,耦合用于表达树木形态发育的L-系统和生理生态模型,形成了L-系统的杉木结构-功能模型。在LSTree软件基础上,集成光合作用、生物量分配等模型,扩展了冠层光合有效辐射(PAR)的空间分布模拟,计算每个叶片上分布的PAR值,为光合作用模型提供核心参数。以福州3-4年生杉木的生长盛期为例,计算不同时刻净光合速率,从而计算各生长阶段的生物量,再把生物量分配到各器官。在生物量驱动下,树木形态结构发生变化,通过迭代,实现生物量驱动下的树木动态生长模拟。净光合速率估算结果与已有相关研究对比,比较合理。这种方法可定量分析、解释植物与环境之间关系。

关键词: 虚拟地理环境, 生长模拟, L-系统, 虚拟植物, 杉木

Abstract:

Energy fixation and organic matter production of forest ecosystem were dominated by plants, which are impacted by their growth environment. The forest ecosystem has the characteristic of long life-span, which makes its research laborious and costly using field experiment. The virtual geographical environment can provide a new way for its research due to its character of trying to exceed the limit of time and space. In order to estimate the biomass and evaluate relationships among tree and environments, an L-systems based functional-structural model was developed for simulating the development of tree architecture, taking into account tree physiology and environment. The L-systems was used to represent the morphological development of tree. The basic growth unit was described in line with the development of young Chinese fir (Cunninghamia lanceolata). LSTree system integrated the photosynthesis, photosynthates allocation and morphogenesis models. The spatial distribution of solar radiation in tree canopy was simulated for calculating photosynthetically active radiation (PAR) of each leaf obtained. PAR is a key parameter for photosynthesis model to estimate biomass. The dynamic growth of an individual 3-to-4-year-old Chinese fir in Fuzhou was simulated in growing season. Based on the 2010 Fuzhou weather and Chinese fir photosynthetic characteristic, net photosynthesis rate and product were calculated for each stage. The amount of photosynthates allocated to the growth of new segments and leaves or branches and leave amplification are based on source-sink theory. The growth of tree is driven by available photosynthetic products after respiration losses were accounted for. The morphogenesis change in the young Chinese fir in response to environment was simulated dynamically in three dimensional representations. The result of net photosynthesis was compared to the previous field observation research, and it showed the simulation result was reasonable. The methodology has promising benefits to depicting the interaction of plant and environment, which will be valuable for estimation of organic matter production too.

Key words: virtual plant, L-systems, growth simulation, Chinese fir, virtual geographical environment