Preliminary Analysis on the Use of a Process-Based Forest Growth Model of Cryptomeria japonica Planted Forest to Represent the Eﬀects of Canopy Structure Change

Hosoda

Iehara

2017

FORMATH

Abstract:This paper aimed to reveal differences in growth response to climatic condition between sugi (Cryptomeria japonica) and hinoki (Chamaecyparis obtusa) by comparing parameters of a carbon balancebased growth model. Seven carbon balance-based growth model parameters related to the rate of photosynthesis, temperature and humidity controls were parameterized by a Bayesian calibration using growth data derived from permanent plots. A hierarchical Bayes model was applied to this parameterization, where the common parameter was estimated first and the species-specific parameters were derived from the common parameter thereafter. Simulated light-response curves using estimated parameters were similar and the photosynthetic rate of sugi was higher than that of hinoki. The patterns of response to temperature represented by estimated parameters were different between sugi and hinoki; sugi responded rapidly to changes in temperature while hinoki responded relatively slowly, resulting in a higher tolerance to low temperature than sugi. Estimated parameters indicated that the photosynthetic rate controlling function for humidity could not be implemented for either species in the model. The parameterization of a carbon balance-based growth model revealed differences in the potential photosynthetic ability and response to temperature of sugi and hinoki. However, we could not represent the control effect of humidity on the photosynthetic rate.

Section: Target Parameters Of the Carbon Balance-based Growth Modelmentioning

confidence: 99%

“…The prior distribution of the target seven parameters and the other parameters used in the model were set according to Mitsuda et al (2011;2013a) and their values are listed in Table 2. …”

Section: Parameterizationmentioning

confidence: 99%

Comparison of Growth Responses to Climatic Conditions of Sugi (Cryptomeria japonica) and Hinoki (Chamaecyparis obtusa) Using a Carbon Balance-Based Growth Model

Hosoda

Iehara

2017

FORMATH

“…We modified the 3-PG model to consist of the following 6 processes: (1) photosynthetically active radiation absorption; (2) photosynthetic production; (3) photosynthetic rate control by temperature and vapor pressure deficit; (4) respiration; (5) litterfall and turnover; and (6) growth partitioning. Details of the model were described in our previous study (Mitsuda et al, 2011).…”

Section: Parameterization Of the Process-based Stand Growth Modelmentioning

confidence: 99%

Relationship between the Parameter of Photosynthetic Rate of a Process-Based Growth Model for Sugi (Cryptomeria japonica) Planted Forests and Topographic Factors

2016

FORMATH

Abstract:This study aimed to examine the relationship between topographic factors and the photosynthetic rate parameter of a process-based growth model for sugi (Cryptomeria japonica) planted forests. The sitespecific photosynthetic parameters were estimated using stand growth data derived from 30 permanent plots established in the Tano Forest Science Station (University of Miyazaki) by Bayesian calibration. The estimated plot-specific photosynthetic rates were related to the following topographic factors: solar radiation index, hydrological upslope contributing area index, vertical and horizontal exposure index, and average slope gradient. Significant but weak correlations were found between the plot-specific photosynthetic rate and all topographic factors except solar radiation index.

Evaluating the Effects of Climate Change on the Potential Site Productivity of Sugi (Cryptomeria japonica) Planted Forests in Kyushu Island, Japan

2018

JFP

This study aimed to evaluate the effect of climate change on the potential site productivity of sugi (Cryptomeria japonica)-planted forests in Kyushu Island. In this study, potential site productivity was defined as the simulated 10-year average of net primary production by using the carbon balance-based stand growth model. The spatial unit was a 1-km grid, which had the same as resolution as the climate data, and 15-year-old sugi-planted forests were virtually established in each 1-km grid in the Kyushu Island. Maps of site productivity estimated using current and future climatic data were obtained and compared to generate a map of sugi site productivity change.The average difference between the estimated current and future potential site productivity was −2.61, and the potential site productivity in 87% of the land area of Kyushu Island and of sugi-planted forests was estimated to decrease with future climatic changes. The increase of respiration rate with an increase in temperature was the main factor for the decrease in the potential site productivity of sugi-planted forests.