地理科学进展 ›› 2004, Vol. 23 ›› Issue (4): 10-18.doi: 10.11820/dlkxjz.2004.04.002

• 生态环境与碳循环 • 上一篇    下一篇

基于MODIS的陆地植被光合过程参数反演研究

夏朝宗1,2, 熊利亚1, 庄大方1, 刘喜云3   

  1. 1. 中科院地理科学与资源研究所,北京 100101;
    2. 国家林业局调查规划设计院,北京 100714;
    3. 北京林业大学水土保持学院,北京 100083
  • 收稿日期:2004-05-01 修回日期:2004-06-01 出版日期:2004-07-24 发布日期:2010-08-07
  • 作者简介:夏朝宗(1975-),男,汉族,四川内江人,博士生,主要从事遥感与地理信息系统应用研究。
  • 基金资助:

    中国科学院创新项目(Kzcx2-308)。

MODIS-based Approach to Estimate Terrestrial Gross Photosynthesis

XIA Chaozong1,2, XIONG Liya1, ZHUANG Dafang1, LIU Xiyun3   

  1. 1. Institute of Geographical Sciences and Natural Resources Research, CAS, Beijing 100101, China;
    2. Academy of Forest Inventory and Planning, State Forestry Administration, Beijing 100714, China;
    3. College of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China
  • Received:2004-05-01 Revised:2004-06-01 Online:2004-07-24 Published:2010-08-07

摘要:

遥感在陆地植被生产力研究中的应用,推动了遥感驱动的陆地生态系统模拟和NPP估算尺度的扩展。NPP遥感模型中,冠层吸收光合有效辐射和辐射利用率是描述植物光合过程的两个关键参数,本文根据太阳辐射在地-气系统中的传输过程和植物光合作用机理,建立基于MODIS数据的参数反演模型,重点研究地表光合有效辐射吸收总量(APARSFC)、冠层光合有效辐射吸收比(RPAR)、辐射利用率(RUE)等的定量提取,并选择东北温带落叶林为研究对象,利用2003年6月MODIS数据,探讨各自在NPP研究中的应用。研究表明:6月东北温带落叶林地表PAR净通量月均值为8.1MJ m-2day-1;RPAR大于0.5,部分地区达到饱和;辐射利用率在0.45~1.09gC MJ-1之间,落叶阔叶林和落叶针叶林均值分别为 0.71和0.69gC MJ-1;净光合产物月累积均值达0.53MgC hm-2,其中,落叶针叶林为0.56MgC hm-2,落叶阔叶林达0.51MgC hm-2,表现出明显的地带性规律,与过程机理模型模拟结果进行比较分析,二者差异很小,体现出良好的一致性。

关键词: MODIS, 辐射利用率, 光合有效辐射, 净第一性生产力, 温带落叶林

Abstract:

Applications of remote sensing in the study of terrestrial productivity open up an effective way for simulating terrestrial ecosystem productivity. In this paper, according to transferring process of solar radiation between atmosphere and land surface, and canopy photosynthesis, MODIS-based models are established to parameterize carbon assimilation by terrestrial plant communication, focused on photosynthetically active radiation absorbed by all surface materials (APARSFC), ratio of PAR absorbed by plant canopy to APARSFC (RPAR), and radiation use efficiency (RUE): (1) A new approach for daily net PAR flux is established, integrated of incident PAR at the top of atmosphere, the total transmission for atmosphere, land albedo, land-surface incident sun-light, and solar hourly angle change during a day, instead of field observation and converting coefficient. And then, daily APARSFC is accumulated to composite monthly APARSFC. (2) RPAR is estimated by an empirical model with FPAR. (3) RUE is evaluated by a biophysically based approach with respect to Amax and leaf area index. The variation of Amax within the canopy is assumed to be governed by its dependence on specific leaf nitrogen, which varies with the canopy due to aging of leaves and acclimation to prevailing irradiance. The parameterized models are further applied to simulate NPP of temperate deciduous forest in Northeast China in June 2003, consisting of deciduous broadleaved forest and deciduous coniferous forest. The results show that APARSFC of temperate deciduous forest woodland in Northeast China gets to climax, the mean PAR values of deciduous broadleaved forest and deciduous coniferous forest reach 8.24 MJ m-2day-1 and 8.63 MJ m-2day-1; with growing leaves, RPAR of most forest canopies is more than 0.5, and saturates in partial forest woodland; RUE varies between 0.45 and 1.09gC MJ-1, the mean RUE is 0.71gC MJ-1 for broadleaved forest, 0.69gC MJ-1 for coniferous forest; monthly NPP is 0.53MgC ha-1, and 0.56MgC ha-1 for deciduous coniferous forest, while 0.51MgC ha-1 for deciduous broadleaved forest. Compared with process-based model, both of them are in agreement with predicted NPP.

Key words: MODIS, NPP, PAR, RUE, temperate deciduous forest