JOURNAL OF NATURAL RESOURCES ›› 2013, Vol. 28 ›› Issue (11): 2012-2022.doi: 10.11849/zrzyxb.2013.11.017

• Comprehensive Discussion • Previous Articles    

The Modeling Algorithms for the Effects of Nitrogen on Terrestrial Vegetation Carbon Cycle Process

LI Lei1,2, HUANG Mei1, GU Feng-xue3, ZHANG Li1   

  1. 1. Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China;
    3. Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agriculture Sciences, Key Laboratory of Dryland Agriculture, MOA, Beijing 100081, China
  • Received:2012-11-21 Revised:2013-03-18 Online:2013-11-20 Published:2013-11-20
  • Contact: 黄玫,E-mail:huangm@igsnrr.ac.cn E-mail:huangm@igsnrr.ac.cn

Abstract: Nitrogen is an important nutrient element for plant growth. Nitrogen deposition is increasing with the increasing human activities, and this will influence terrestrial ecosystem carbon cycle greatly. Expressing accurately and quantitatively the effects of nitrogen on carbon cycle is the key factor to predict the global carbon balance change. This paper systematically summarizes the mathematical algorithms for the effects of nitrogen on photosynthesis and respiration, assimilates allocation processes in the state-of-the-art biogeochemical models, and analyses the sources of uncertainties in the algorithms used in each process. The future trends of model approaches are: development of new algorithms for photosynthetic process which reflects nitrogen saturation phenomenon and describes explicitly the relationship between nitrogen and photosynthetic rate; development of new algorithms for respiration process which reflects the relationships between nitrogen and the respiration rate for each part of the plant components (such as root, stem and leaf); and development of dynamic assimilates allocation algorithms on the basis of mechanism research. Because most of the current models do not include the nitrogen saturation phenomenon in their photosynthesis algorithms, these models will overestimate the effects of nitrogen deposition on photosynthetic rate when used to predict the future global carbon balance. Our research results will benefit to further carbon and nitrogen interaction researches and to provide references for carbon and nitrogen coupled model researches.

Key words: assimilate allocation process, respiration, biogeochemical model, carbon and nitrogen interaction, photosynthesis

CLC Number: 

  • S154.4