Abstract
Purpose
The water-level-fluctuating zone (WLFZ) is the buffer zone of energy and material exchange between terrestrial and aquatic ecosystems. Artificial vegetation restoration of WLFZ can improve the interception capacity of P pollution. The purpose of this study is to explore the effect of artificial vegetation restoration on the bioavailability of soil phosphorus (P) in the WLFZ.
Material and methods
Soil samples from different spatial locations (natural vegetation zone, artificial vegetation restoration zone) and different altitudes of the WLFZ were collected in the Three Gorges Reservoir (TGR) region, Chongqing, China. Soil P fraction, microbial biomass P (MBP), and phosphatase activity were measured.
Results and discussion
Artificial vegetation restoration changed the spatial distribution patterns of soil bioavailable P (Bio-P) in the WLFZ. The soil bioavailable inorganic P (Bio-Pi) in the artificial vegetation restoration zone was significantly higher than those at the natural vegetation zone (p < 0.05) and its content decreased with the decrease of altitude. The content of bioavailable organic P (Bio-Po) in the two transects was not significantly different in general, but was different at different altitudes. Phosphodiesterase (PDE) activity was negatively correlated with Bio-Po in artificial vegetation restoration zone (p < 0.01, R2 = 0.21), but significantly positively correlated with in natural vegetation zone (p < 0.05, R2 = 0.17); this suggests that the relationship between Bio-Po and PDE activity was altered by vegetation restoration. Moreover, the factors controlling the bioavailability of P in the WLFZ are discussed.
Conclusion
Artificial vegetation restoration and altitude are the control factors of soil P fractions and bioavailability in WLFZ. Vegetation restoration can increase soil TP and Bio-Pi in general but has little effect on Bio-Po.
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Funding
This study was sponsored jointly by the National Key Research and Development Project (2021YFC3201002), the Strategic Priority Research Program of CAS (XDB40020400), the National Natural Science Foundation of China (41977296, 42277253, 51809287, U2040211), the Guizhou Science and Technology Department Fund ([2020] 4Y006, [2019]1042), the Central Leading Local Science and Technology Development Fund Project ([2021]4028), the Youth Innovation Promotion Association CAS (No. 2019389), and the Follow-up Work of the Three Gorges Project (2136902).
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Qiu, S., Wang, Y., Wang, J. et al. Effects of artificial vegetation restoration on the fractions and availability of soil phosphorus in the water-level-fluctuating zone of Three Gorges Reservoir, China. J Soils Sediments (2023). https://doi.org/10.1007/s11368-023-03603-x
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DOI: https://doi.org/10.1007/s11368-023-03603-x