Study on the simulation of soil carbon sink in grassland ecological management in China — based on IPCC inventory method

doi:10.12006/j.issn.1673-1719.2022.255

Abstract

Abstract:

Grassland is an important ecosystem carbon pool in China. Several grassland ecological protection projects have been implemented to control grassland degradation and desertification in China. To reveal the impact of ecological management on ecosystem carbon sequestration, four future scenarios of grassland ecological management were set based on the current intensity of grassland ecological managements. Grassland soil carbon sequestration was estimated in China from 2001 to 2030 by using the IPCC Method for National Greenhouse Gas Inventories. The results showed that the mean grassland carbon sequestration was -0.54×10⁸ t CO₂ eq/a from 2001 to 2010 in China. The grassland soil carbon sequestration significantly increased to -1.00×10⁸ t CO₂ eq/a on average during 2011-2017. Under different grassland ecological management scenarios, the grassland soil carbon sequestration is -0.42×10⁸ to -2.00×10⁸ t CO₂ eq/a in China. And grassland soil will sequestrate -5.46×10⁸ to -26.01×10⁸ t CO₂ eq accumulatively from 2018 to 2030. This study provides reference for the formulation of future grassland ecological management policies.

Key words: Grassland ecological management, Soil carbon sequestration, IPCC inventory, Simulation

HU Guo-Zheng, HASBAGAN Ganjurjav, LI Ming-Jie, YU Pei-Dong, GAO Qing-Zhu. Study on the simulation of soil carbon sink in grassland ecological management in China — based on IPCC inventory method[J]. Climate Change Research, 2023, 19(3): 371-380.

Figures/Tables 9

Table 1 Grassland ecological projects in China from 2000 to 2015

Table 2 Emission factors of grassland ecological managements and degradation

Table 3 Soil organic matter, buck density, area ratio and degradation ratio of each grassland type

Fig. 1 Grassland ecological management area of China. (Orange area represents the confident range. The uncertainty of scenario 1 is the confident range of moving average. The uncertainty of simulation and other scenarios are the predictive range of linear models)

Table 4 Grassland carbon sequestration comparation between this study and other studies

Fig. 2 Grassland carbon sequestration of China in every 5 years during 2001-2017

Fig. 3 Grassland carbon sequestration dynamics of China from 2001 to 2030

Fig. 4 Greenhouse gas (GHG) emission of “grassland remaining grassland” of each country

Fig. 5 GHG emission of “grassland remaining grassland” of world major economies from 1990 to 2019

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