A one-compartment model to study soil carbon decomposition rate at equilibrium situation

Yang, Xuezhi; Wang, Mingxing; Huang, Yao; Wang, Yuesi

doi:10.1016/s0304-3800(01)00485-9

Cited by 24 publications

(12 citation statements)

References 33 publications

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“…Based on natural vegetation and undisturbed sites of the global observed SOC density dataset (100 cm in depth) [46], Yang et al [47] reported a simple model for steady state k values as follows:

k_{normalw} = 0.061 {PER}^{0.7521}, if PER < 1.0 (R^{2} = 0.153; n = 683; P < 0.001)

k_{normald} = 0.0476 {PER}^{- 0.3305}, if PER > 1.0 (R^{2} = 0.038; n = 292; P < 0.05)

where MAT is mean annual temperature, k w and k d decomposition rates for wet and dry soil conditions, respectively. PER provides an aridity index that represents the interactive impact of BT and PPT on decomposition rates [15,48,54].…”

Section: Methodsmentioning

confidence: 99%

Modeling Potential Distribution and Carbon Dynamics of Natural Terrestrial Ecosystems: A Case Study of Turkey

Evrendilek

Berberoğlu

Gulbeyaz

et al. 2007

Sensors

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We derived a simple model that relates the classification of biogeoclimate zones, (co)existence and fractional coverage of plant functional types (PFTs), and patterns of ecosystem carbon (C) stocks to long-term average values of biogeoclimatic indices in a time- and space-varying fashion from climate–vegetation equilibrium models. Proposed Dynamic Ecosystem Classification and Productivity (DECP) model is based on the spatial interpolation of annual biogeoclimatic variables through multiple linear regression (MLR) models and inverse distance weighting (IDW) and was applied to the entire Turkey of 780,595 km2 on a 500 m × 500 m grid resolution. Estimated total net primary production (TNPP) values of mutually exclusive PFTs ranged from 108 ± 26 to 891 ± 207 Tg C yr-1 under the optimal conditions and from 16 ± 7 to 58 ± 23 Tg C yr-1 under the growth-limiting conditions for all the natural ecosystems in Turkey. Total NPP values of coexisting PFTs ranged from 178 ± 36 to 1231 ± 253 Tg C yr-1 under the optimal conditions and from 23 ± 8 to 92 ± 31 Tg C yr-1 under the growth-limiting conditions. The national steady state soil organic carbon (SOC) storage in the surface one meter of soil was estimated to range from 7.5 ± 1.8 to 36.7 ± 7.8 Pg C yr-1 under the optimal conditions and from 1.3 ± 0.7 to 5.8 ± 2.6 Pg C yr-1 under the limiting conditions, with the national range of 1.3 to 36.7 Pg C elucidating 0.1% and 2.8% of the global SOC value (1272.4 Pg C), respectively. Our comparisons with literature compilations indicate that estimated patterns of biogeoclimate zones, PFTs, TNPP and SOC storage by the DECP model agree reasonably well with measurements from field and remotely sensed data.

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k_{normalw} = 0.061 {PER}^{0.7521}, if PER < 1.0 (R^{2} = 0.153; n = 683; P < 0.001)

k_{normald} = 0.0476 {PER}^{- 0.3305}, if PER > 1.0 (R^{2} = 0.038; n = 292; P < 0.05)

Section: Methodsmentioning

confidence: 99%

Modeling Potential Distribution and Carbon Dynamics of Natural Terrestrial Ecosystems: A Case Study of Turkey

Evrendilek

Berberoğlu

Gulbeyaz

et al. 2007

Sensors

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“…NPP within each climatological grid cell is estimated by using a modified version of Miami model (Friedlingstein et al 1992;Yang et al 2002), which predicts total NPP globally from precipitation and mean annual ''biotemperature'' (only monthly temperatures in 0-30°C range are accounted for mean annual biotemperature), instead of simple mean temperature used by the original Miami model (Lieth 1975). Estimates by this simple NPP model are reasonable for major biomes (Dai and Fung 1993), and we assume that this model is satisfactory to reproduce fundamental environmental dependencies of NPP.…”

Section: Litter Inputsmentioning

confidence: 99%

The global-scale temperature and moisture dependencies of soil organic carbon decomposition: an analysis using a mechanistic decomposition model

2006

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Since the decomposition rate of soil organic carbon (SOC) varies as a function of environmental conditions, global climate change is expected to alter SOC decomposition dynamics, and the resulting changes in the amount of CO 2 emitted from soils will feedback onto the rate at which climate change occurs. While this soil feedback is expected to be significant because the amount of SOC is substantially more than the amount of carbon in the atmosphere, the environmental dependencies of decomposition at global scales that determine the magnitude of the soil feedback have remained poorly characterized. In this study, we address this issue by fitting a mechanistic decomposition model to a global dataset of SOC, optimizing the model's temperature and moisture dependencies to best match the observed global distribution of SOC. The results of the analysis indicate that the temperature sensitivity of decomposition at global scales (Q 10 =1.37) is significantly less than is assumed by many terrestrial ecosystem models that directly apply temperature sensitivity from small-scale studies, and that the maximal rate of decomposition occurs at higher moisture values than is assumed by many models.These findings imply that the magnitude of the soil decomposition feedback onto rate of global climate change will be less sensitive to increases in temperature, and modeling of temperature and moisture dependencies of SOC decomposition in global-scale models should consider effects of scale.

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“…It is a scheme that uses the three bioclimatic variables derived from standard meteorological data to formulate the relation of climate patterns and broad-scale vegetation distribution. It has been widely accepted in projecting impacts of climate change on vegetation distributions (Chen et al, 2003(Chen et al, , 2005Chinea and Helmer, 2003;Kerr et al, 2003;Yang et al, 2002;Yue et al, 2001;Xu and Yan, 2001;Peng, 2000;Kirilenko et al, 2000;Powell et al, 2000;Dixon et al, 1999;Metternicht and Zinck, 1998;Belotelov et al, 1996;Smith et al, 1992;Post et al, 1982).…”

Section: Introductionmentioning

confidence: 99%

Changes of major terrestrial ecosystems in China since 1960

Tian

Fan

Liu

2005

Global and Planetary Change

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A one-compartment model to study soil carbon decomposition rate at equilibrium situation

Cited by 24 publications

References 33 publications

Modeling Potential Distribution and Carbon Dynamics of Natural Terrestrial Ecosystems: A Case Study of Turkey

Modeling Potential Distribution and Carbon Dynamics of Natural Terrestrial Ecosystems: A Case Study of Turkey

The global-scale temperature and moisture dependencies of soil organic carbon decomposition: an analysis using a mechanistic decomposition model

Changes of major terrestrial ecosystems in China since 1960

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