[Response of Soil Organic Carbon Accumulation in Paddy Fields in Fujian Province to Future Temperature Increases]

Yan Che; Long-Xia Qiu; Ling-Yun Wu; Jun Long; Ting Wu; Jing Li; Shi-He Xing; Li-Ming Zhang

doi:10.13227/j.hjkx.202205036

[Response of Soil Organic Carbon Accumulation in Paddy Fields in Fujian Province to Future Temperature Increases]

Huan Jing Ke Xue. 2023 May 8;44(5):2775-2785. doi: 10.13227/j.hjkx.202205036.

[Article in Chinese]

Authors

Yan Che^{1

2}, Long-Xia Qiu^{1

2}, Ling-Yun Wu³, Jun Long⁴, Ting Wu^{1

2}, Jing Li^{1

2}, Shi-He Xing^{1

2}, Li-Ming Zhang^{1

2}

Affiliations

¹ College of Resource and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
² University Key Laboratory of Soil Ecosystem Health and Regulation in Fujian, Fuzhou 350002, China.
³ Fujian Crop Land Construction and Soil and Fertilizer Station, Fuzhou 350002, China.
⁴ School of Biological Science and Technology, Minnan Normal University, Zhangzhou 363000, China.

PMID: 37177950
DOI: 10.13227/j.hjkx.202205036

Abstract

Understanding the effect of the soil carbon "source-sink" in cropland in China under future warming scenarios is the basis for making reasonable carbon neutralization policies. This study focused on the paddy soil in Fujian Province, a typical subtropical region in China including 84 counties (cities and districts). We employed the 1:50000 soil database and biogeochemical process model (DNDC) to simulate the dynamic changes in paddy soil organic carbon under different warming scenarios for the period of 2017-2053. The results indicated that in the context of normal temperature (control run) and 2, 4, and 6℃ of warming, the total amounts of carbon sequestration of paddy soil in Fujian Province were 11.56,9.44, 7.08, and 4.91 Tg, respectively; accordingly, the average annual carbon sequestration rates (expressed by C) were 173, 141, 106, and 74 kg·(hm²·a)^-1, indicating that the rate of carbon sequestration was decreasing with the increase in future temperature. However, overall, the paddy field soil in the province was still a "carbon sink" under the warming of 6 (C. We also found that the gleyed paddy soil was mostly affected by the increase in temperature, and the decrease in carbon sequestration rate ranged from 20% to 69% using different treatments. In contrast, the salinized paddy soil was slightly affected, with a 14%-43% decrease in carbon sequestration rates. As for the different administrative regions, Sanming City was the most affected by temperature increase, with the rate of carbon sequestration decreasing by 27%-83% using different treatments. However, it was reduced by only 10%-41% and 14%-42% in Quanzhou and Putian (coastal areas), respectively. Overall, due to different soil properties, fertilization management, and climatic environment, there was a strong variability in the carbon sequestration rates of paddy soil for different soil subtypes and administrative regions in Fujian in response to future climatic warming.

Keywords: 1[DK1]:50000 soil database; Fujian Province; paddy soil; soil organic carbon; temperature.

Publication types

English Abstract