气候变化领域集成服务门户(CCPortal): Dynamics and fractions of soil organic carbon in response to 35 years of afforestation in subtropical China

CCPortal

DOI	10.1007/s11104-024-06493-1
	Dynamics and fractions of soil organic carbon in response to 35 years of afforestation in subtropical China
	Yang, Lu; Song, Xianwei; Lyu, Sidan; Shen, Weijun; Gao, Yang
发表日期	2024
ISSN	0032-079X
EISSN	1573-5036
英文摘要	Background and aims The accumulation of soil organic carbon (SOC) is a crucial process in mitigating climate change and ensuring soil quality. Subtropical plantations in China have shown high potential for enhancing SOC sequestration due to their high carbon sink capacity. However, the dynamics and compositions of SOC after long term afforestation are still poorly understood. Methods We examined the dynamics of SOC and its fractions of different soil layers (0-5 cm, 5-10 cm, 10-20 cm, 20-40 cm, 40-80 cm, 80-100 cm) in a mixed broadleaf-conifer plantation (BCP), a Masson pine plantation (MP), and a Slash pine plantation (SP), and an enclosed forest (EF) in subtropical China. Both physical fractions (particulate organic carbon (POC), soil clay organic carbon (SOCclay), soil silt organic carbon (SOCsilt)) and chemical fractions (iron-aluminum-bound organic carbon (Fe/Al-OC), and calcium-bound organic carbon (Ca-OC)) were determined. Additionally, soil physicochemical properties were further analyzed. Results Our results showed the SOC storage in the EF, BCP, MP, and SP in 2019 increased by 82%, 238%, 126%, and 103% respectively compared to 1984. The proportions of MAOC to SOC were respectively as follows: SP (65.9%) > BCP (64.9%) > EF (61.6%) > MP (53.9%). The mean proportions of SOC(clay )to MAOC were as follows: BCP (71.1%) > EF (66.9%) > MP (58.5%) > SP (51.0%). The mean proportions of Fe/Al-OC to MAOC were as follows: EF (53.3%) > SP (48.3%) > MP (47.9%) > BCP (39.8%). All these proportion increased with soil depth. RDA and PLS-SEM analysis revealed that soil nitrogen content and electrochemical properties (pH and EC) were the main factors that controlled SOC content and fractions. Conclusions Subtropical plantations have significant soil carbon sequestration capabilities, but they are currently nearing saturation. Soil nitrogen content may be key factor limiting further enhancement of carbon sequestration. Due to the high proportion of MAOC and relative consistent SOC storage, BCP and SP are recommended as priorities for plantation regeneration in subtropical China.
英文关键词	Forest type; Soil organic carbon; Particulate organic carbon; Mineral-associated organic carbon
语种	英语
WOS研究方向	Agriculture ; Plant Sciences
WOS类目	Agronomy ; Plant Sciences ; Soil Science
WOS记录号	WOS:001161807600003
来源期刊	PLANT AND SOIL
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/304293
作者单位	Guangxi University; Chinese Academy of Sciences; Institute of Geographic Sciences & Natural Resources Research, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS
推荐引用方式 GB/T 7714	Yang, Lu,Song, Xianwei,Lyu, Sidan,et al. Dynamics and fractions of soil organic carbon in response to 35 years of afforestation in subtropical China[J],2024.
APA	Yang, Lu,Song, Xianwei,Lyu, Sidan,Shen, Weijun,&Gao, Yang.(2024).Dynamics and fractions of soil organic carbon in response to 35 years of afforestation in subtropical China.PLANT AND SOIL.
MLA	Yang, Lu,et al."Dynamics and fractions of soil organic carbon in response to 35 years of afforestation in subtropical China".PLANT AND SOIL (2024).