Applications and Evaluations of Dynamic Root Scheme with Carbon-Water-Nitrogen Interactions in Land Surface Model SSiB4

Yifan ZHANG; Xin MIAO; Weidong GUO

doi:10.7522/j.issn.1000-0534.2020.00005.

Plateau Meteorology >

2020 , Vol. 39 >Issue 3: 511 - 522

DOI: https://doi.org/10.7522/j.issn.1000-0534.2020.00005.

Applications and Evaluations of Dynamic Root Scheme with Carbon-Water-Nitrogen Interactions in Land Surface Model SSiB4

Yifan ZHANG ,
Xin MIAO ,
Weidong GUO

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School of Atmospheric Science, Nanjing University, Nanjing 210023, Jiangsu, China

Received date: 2019-12-24

Online published: 2020-06-28

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Abstract

Root system is an important part of vegetation. The dynamic changes of root system can change soil moisture by adjusting the amount of water absorbed from root system, and then affect the biophysical processes such as soil evaporation and the biochemical processes such as transpiration and photosynthesis of vegetation. Eventually, the material cycle and the hydrothermal cycle of the ecosystem are changed by the dynamic changes of root system accordingly. In this study, soil water stress and soil nutrient (nitrogen) stress were considered to simulate the dynamic distribution of root carbon in different soil layers, and the dynamic change of root system was characterized by the ratio of carbon content in root system. Based on SSiB4 model, the single-point simulation experiment was carried out at BRSa3 site in Amazon region and CN-Qia site in Qianyanzhou, China to study the effects of dynamic root system scheme on the simulation of soil moisture and land-atmosphere flux. The results showed that the dynamic distribution of root enables more soil water to be absorbed, which improved the simulation effect of shallow soil moisture, and then improved the simulation accuracy of carbon dioxide flux, sensible heat flux and latent heat flux. At the BRSa3 and CN-Qia sites, the correlation coefficients between the observed and simulated daily mean values of soil moisture were increased by 0.02 and 0.04, respectively, and the correlation coefficients of carbon dioxide were increased by 0.76 and 0.13, respectively, which all passed the 99% significance test. The simulation of carbon absorption capacity of BRSa3 site in dry season and CN-Qia site in summer has been improved, and the absolute deviation was improved by 33%, 106%, respectively. The correlation coefficients between observed and simulated daily mean carbon dioxide flux were increased by 0.17 and 0.26, which passed the 99% significance test. In general, all the variables were closer to the observed values after considering the dynamic root system scheme during the simulated time, and the improvements of soil moisture and carbon dioxide flux were more evident than that of sensible heat flux and latent heat flux. The indirect effect of soil moisture on sensible heat flux and latent heat flux through physical processes of soil may be the main reason for the differences of the results. The improvements were more evident at BRSa3 site. The root depth and structure of different vegetation cover types may be the main reason for the differences of the results.

Key words： Dynamic root scheme; land surface model; hydrothermal fluxes; soil moisture; carbon dioxide flux

Cite this article

Yifan ZHANG , Xin MIAO , Weidong GUO . Applications and Evaluations of Dynamic Root Scheme with Carbon-Water-Nitrogen Interactions in Land Surface Model SSiB4[J]. Plateau Meteorology, 2020 , 39(3) : 511 -522 . DOI: 10.7522/j.issn.1000-0534.2020.00005.

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