Source and degradation of soil organic matter in different vegetations along a salinity gradient in the Yellow River Delta wetland

IF 5.4 1区 农林科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
Xin Ni , Guangming Zhao , John R. White , Peng Yao , Kehui Xu , Yadav Sapkota , Jiancong Liu , Hao Zheng , Dapeng Su , Lei He , Qiang Liu , Shixiong Yang , Hongming Yuan , Xigui Ding , Yao Zhang , Siyuan Ye
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引用次数: 0

Abstract

Salt marsh wetlands exhibit high carbon capture and storage capabilities, which are crucial for mitigating climate change. However, the mechanisms of soil organic carbon (SOC) sequestration in coastal deltaic salt marsh wetlands are not well understood. To bridge this gap, we present new findings on the distribution, sources, and decomposition of SOC in the Yellow River Delta wetland, focusing on four vegetation types along a salinity gradient: Phragmites australis, Tamarix chinensis, Suaeda salsa, and Spartina alterniflora. The input of litter was found to be the primary factor affecting SOC at the depth from 20 to 100 cm, while microbial degradation and clay content were the main factors in the deeper soil layers between 20 and 100 cm. The SOC in all four communities was predominantly derived from recalcitrant organic carbon (81 %–99 %). A Monte Carlo model revealed that terrestrial sources accounted for 61 % of SOC, plant sources for 31 %, and marine sources for 8 %. The vertical distribution of δ13C profiles in Phragmites australis and Spartina alterniflora communities was influenced by preferential utilization of 12C and substrate, with SOC degradation rate constants of 0.28 and 1.02 per annum (a−1), respectively. The invasion of Spartina alterniflora has led to a significant increase in the easily oxidizable carbon (EOC) to SOC ratio, thus reducing SOC stability, which underscores the importance of mitigating Spartina alterniflora invasion. SOC stability was increased by evaluated salinity in the Yellow River Delta wetland, which was higher than that in Chinese coastal wetlands.
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来源期刊
Catena
Catena 环境科学-地球科学综合
CiteScore
10.50
自引率
9.70%
发文量
816
审稿时长
54 days
期刊介绍: Catena publishes papers describing original field and laboratory investigations and reviews on geoecology and landscape evolution with emphasis on interdisciplinary aspects of soil science, hydrology and geomorphology. It aims to disseminate new knowledge and foster better understanding of the physical environment, of evolutionary sequences that have resulted in past and current landscapes, and of the natural processes that are likely to determine the fate of our terrestrial environment. Papers within any one of the above topics are welcome provided they are of sufficiently wide interest and relevance.
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