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冠层分层数对净生态系统生产力模拟精度的影响——以长白山温带针阔混交林为例

乔延艳1,任传友1,王艳华1*,杨亚丽1,王冠2,尚莹1,陈美娟1   

  1. 1沈阳农业大学农学院, 沈阳 110866; 2延边朝鲜族自治州气象局, 吉林延吉 133000)
  • 出版日期:2016-06-10 发布日期:2016-06-10

Effect of canopy layers on the accuracy of net ecosystem productivity simulation: A case study on temperate mixed broadleaf-conifer forest ecosystem of Changbai Mountain.

QIAO Yan-yan1, REN Chuan-you1, WANG Yan-hua1*, YANG Ya-li1, WANG Guan2, SHANG Ying1, CHEN Mei-juan1#br#   

  1. (1Agronomy College of Shenyang Agricultural University, Shenyang 110866, China; 2Bureau of Meteorology of Yanbian Korean Autonomous Prefecture, Yanji 133000, Jilin, China).
  • Online:2016-06-10 Published:2016-06-10

摘要:

以2003—2008年常规气象梯度观测数据为驱动数据,应用多层模型模拟了不同冠层分层数下长白山温带针阔混交林净生态系统生产力(NEP),对比涡度相关通量观测数据,以确定系数(R2)最大及均方根误差(RMSE)最小作为评判标准,分析评价了不同冠层分层数对NEP模拟精度的影响,得出如下结论:(1)模型在不同分层情况下均具有较好的NEP日变化再现能力,当冠层分层数较少时,表现出NEP低估的倾向,而分层数较多时有高估倾向;(2)当分层数较少时,随着分层数的增加,模型模拟NEP日变化的能力增强,模拟误差变小;当分层数增加到一定数值,随着分层数的继续增加,模型模拟NEP日变化的能力趋于平稳,而模拟误差呈增大趋势;(3)采用多层模型对长白山温带针阔混交林生态系统NEP进行模拟时,以将冠层分为4~7层为宜。研究结果可为陆地生态系统NEP的模型研究提供参考。
 

关键词: 壶穴, 生境, 模式系统, 山地河流

Abstract: Based on meteorological gradient observation data during 2003-2008, the net ecosystem productivity (NEP) was simulated using multi-layer model under different canopy layered numbers of mixed broadleaf-conifer forest of Changbai Mountain. By comparing the modeled NEP with those measured by eddy covariance system, the influence of different layered numbers on simulated NEP accuracy was analyzed with the criteria of the maximum coefficient of the determination (R2) and the minimum rootmeansquare error (RMSE). The results showed that: (1) The model built in this study had good reappearance ability of diurnal NEP variation under different canopy layered numbers, but showing a tendency to undervaluing NEP when the layered number was small and a tendency to overestimating NEP when the layered number was large. (2) The ability to simulate diurnal variation of NEP increased with the increase of layered number when the layered number was small, while the ability to simulate diurnal variation of NEP was relatively stable with the increase of layered number when the layered number exceeded by a certain value. (3) It was advisable to divide the canopy into 4-7 layers when NEP was estimated by multilayer model at mixed broadleaf-conifer forest ecosystem of Changbai Mountain. The results can provide reference for the study of the NEP simulation of forest ecosystem.

Key words: pothole, habitat, model system, mountain river.