Post-agricultural succession affects the accumulation and enzymatic transformation of organic phosphorus in a karst area, southwest China

文献类型： 外文期刊

第一作者： Peng, Song

作者： Peng, Song;Kuang, Xizhi;Cai, Kunzheng;Tian, Jihui;Cheng, Hanting;Wei, Kai

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关键词： Land use change; Karst region; Phosphorus fraction; P-31 NMR; Phosphatase activity; Vegetation succession

期刊名称：PLANT AND SOIL （ 影响因子：4.9； 五年影响因子：5.2 ）

ISSN： 0032-079X

年卷期： 2023 年

页码：

收录情况： SCI

摘要： BackgroundSoil phosphorus (P) availability is crucial for the restoration of degraded ecosystems, but how soil organic P transforms during post-agricultural succession remains poorly understood in karst ecosystems.MethodsA typical recovery gradient including manual (orchard) and natural (grassland and secondary forest) vegetation restoration after agricultural abandonment was established in a karst region of southwest China. Sequential fractionation, solution P-31 nuclear magnetic resonance (NMR) and enzyme assays were performed to investigate the chemical nature and biochemical transformation of organic P during post-agricultural succession in a karst region of southwest China.ResultsWe found significant redistributions of soil P fractions from inorganic P to organic P after agricultural abandonment. Specifically, orthophosphate decreased by 10.5% to 34.6%, while phosphomonoester and phosphodiester increased from 9.0% to 33.9% and 0.79% to 2.64%, respectively, during post-agricultural succession. The increased P limitation and organic P substrates induced higher phosphatase activities, with the highest acid phosphomonoesterase activity observed in secondary forest while the highest phosphodiesterase and alkaline phosphomonoesterase activities observed in grassland. Moreover, structural equation modelling demonstrated a clear increase in microbial production of alkaline phosphomonoesterase and the potential hydrolysis of phosphomonoesters under elevated P limitation.ConclusionsIn summary, our findings suggested that agricultural abandonment caused redistributions of soil inorganic P to organic P, with alkaline phosphomonoesterase-mediated phosphomonoester turnover playing a crucial role in soil P availability during post-agricultural succession in karst ecosystem.

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