Effects of Shrub Expansion on Soil Microbial Diversity in Wetlands of Sanjiang Plain

doi:10.11924/j.issn.1000-6850.casb2024-0585

Abstract

Abstract:

Shrub expansion affects plant growth and soil physicochemical properties, leading to changes in the metabolic pathway of the soil microbiota. However, little is known about the relationship between different intensities of shrub expansion and the soil microbial community structure and diversity in the short term. In this study, we investigated the changes in soil microbial community structure under varying intensities of shrub expansion in the wetlands of the Sanjiang Plain using phospholipid fatty acids (PLFA) technology. The results showed that soil microbial taxa at different shrub expansion intensities were dominated by Gram-positive bacteria, Gram-negative bacteria, fungi, saprophytic fungi, and tufted mycorrhizal fungi. Additionally, the cumulative concentrations of all PLFA biomarkers were ranked as followed: CK>MI>HI>SI. Shrub expansion altered soil microbial abundance; however, the effect on their relative abundance was not significant. Different intensities of shrub invasion had a significant impact on soil microbial composition (β-diversity) but not on α-diversity when compared to CK. The primary physicochemical drivers of the differences in soil microbial communities caused by shrub expansion were total nitrogen (TN), soil organic carbon (SOC), total phosphorus (TP) and available phosphorus (AP). The findings of this study aim to support the scientific management of integrated wetland systems, such as the restoration of marsh ecosystems in the Sanjiang Plain and the stabilization of ecosystem structure.

Key words: phospholipid fatty acid (PLFA), shrub expansion, soil microorganism, Sanjiang Plain

WANG Shenzheng, ZHANG Rongtao, LI Lin, CHAI Chunrong. Effects of Shrub Expansion on Soil Microbial Diversity in Wetlands of Sanjiang Plain[J]. Chinese Agricultural Science Bulletin, 2025, 41(11): 82-89.

Figures/Tables 9

References 39

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Site	PH	TN/(g/kg)	SOC/(g/kg)	TP/(g/kg)	AP/(mg/kg)	NH₄⁺/(mg/kg)	NO₃^-/(mg/kg)
CK	5.35±0.12a	3.00±0.24a	33.48±3.87a	0.84±0.07a	8.75±1.617a	14.04±5.74ab	1.99±0.75a
SI	5.23±0.12a	3.75±0.84a	39.85±8.91a	1.03±0.15a	8.26±4.14a	8.09±2.53b	1.82±0.03a
MI	5.26±0.14a	3.27±1.65a	35.42±19.41a	1.07±0.17a	8.17±2.92a	16.01±2.53a	1.56±0.18a
HI	5.20±0.12a	3.31±1.20a	34.44±13.59a	1.09±0.10a	10.17±3.88a	7.34±0.84b	1.49±0.45a

Site	PH	TN/(g/kg)	SOC/(g/kg)	TP/(g/kg)	AP/(mg/kg)	NH₄⁺/(mg/kg)	NO₃^-/(mg/kg)
CK	5.35±0.12a	3.00±0.24a	33.48±3.87a	0.84±0.07a	8.75±1.617a	14.04±5.74ab	1.99±0.75a
SI	5.23±0.12a	3.75±0.84a	39.85±8.91a	1.03±0.15a	8.26±4.14a	8.09±2.53b	1.82±0.03a
MI	5.26±0.14a	3.27±1.65a	35.42±19.41a	1.07±0.17a	8.17±2.92a	16.01±2.53a	1.56±0.18a
HI	5.20±0.12a	3.31±1.20a	34.44±13.59a	1.09±0.10a	10.17±3.88a	7.34±0.84b	1.49±0.45a