Elucidating the kinetics of phosphorus (P) sorption and desorption in soil aggregates of different sizes has important implications for the regulation of plant growth and development in revegetation desert ecosystems. In this study, the Freundlich models were used to describe the kinetics of P sorption and desorption by soil aggregates of five sizes (0.5–0.25, 0.25–0.15, 0.15–0.10, 0.10–0.05 and <0.05 mm) in a long-term revegetation desert ecosystem. The results showed that long-term (>65 years) revegetation significantly improved the properties of desert soil in terms of P fractions (p < 0.05), soil bulk density (p < 0.05), and soil type. The Freundlich models well-described P sorption and desorption by soil aggregates in the revegetated desert. Soil aggregates of 0.25–0.15 mm adsorbed the lowest amount of P (P adsorbed: K_F = 0.26, n = 0.97) but desorbed the highest amount of P (P desorbed: K_F = 2.41, n = −0.97). Soil aggregates of <0.05 mm adsorbed the most P (P adsorbed: K_F = 0.60, n = 0.85) but desorbed the lowest P (P desorbed: K_F = 1.67, n = −1.00). Furthermore, P sorption was fastest when the added P was 0–1.0 mg L⁻¹, and P desorption was fastest at 1–3 hr. Soil aggregates that were 0.25–0.15 mm in size had the highest mass proportion in the long-term revegetation desert and played a key role in supporting available P for plant development. Soil aggregates of <0.05 mm adsorbed the most P; however, their contribution was constrained because they had the smallest mass proportion and the lowest amount of P desorption.

中文翻译：

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长期植被恢复荒漠生态系统中土壤团聚体对磷的吸附/解吸动力学

阐明不同尺寸土壤团聚体中磷 (P) 吸附和解吸的动力学对于调控沙漠再植被生态系统中植物的生长和发育具有重要意义。在本研究中，Freundlich 模型用于长期描述 5 种尺寸（0.5-0.25、0.25-0.15、0.15-0.10、0.10-0.05 和 <0.05 mm）土壤团聚体对磷的吸附和解吸动力学。重新植被沙漠生态系统。结果表明，长期（>65 年）植被恢复显着改善了荒漠土壤的 P 组分（p  < 0.05）、土壤容重（p < 0.05) 和土壤类型。Freundlich 模型很好地描述了重新植被沙漠中土壤聚集体对磷的吸附和解吸。0.25-0.15 mm 的土壤团聚体吸附 P 的量最低（吸附的 P：K _F  = 0.26，n  = 0.97），但解吸的 P 量最高（解吸的 P：K _F  = 2.41，n  = -0.97）。<0.05 mm 的土壤团聚体吸附的 P 最多（吸附的 P：K _F  = 0.60，n  = 0.85），但解吸的 P 最低（解吸的 P：K _F  = 1.67，n  = -1.00）。此外，当添加的 P 为 0-1.0 mg L ^{-1时，P 吸附最快}, P 解吸最快在 1-3 小时。0.25-0.15 mm大小的土壤团聚体在长期植被恢复沙漠中的质量比例最高，在支持植物发育的有效磷方面发挥了关键作用。<0.05 mm的土壤团聚体吸附P最多；然而，它们的贡献受到限制，因为它们具有最小的质量比例和最低的 P 解吸量。