Understanding the characteristics of soil phosphorus (P) sorption and desorption is essential for comprehending P biogeochemical cycling and effectively managing ecosystems in a desert revegetation chronosequence. The present study utilized the Freundlich model and enzymatic activity to characterize the features of P sorption–desorption, and microbial activity, which aims to elucidate the effect of P kinetics and microbial activity on P fractions in the soils of a desert revegetation chronosequence, consisting of 11, 31, 40, 57, and 65 years old revegetated deserts. The findings revealed that the 31 years old soil showed the highest alkaline phosphomonoesterase and phosphodiesterase activities, and the 40 years old displayed the highest inorganic pyrophosphatase activity. In revegetated desert soils, microbial activity changed P sorption–desorption kinetics by decreased or increased the parameters including sorption/desorption energy site, P sorption/desorption ability, and the maximum buffering capacity of P sorption/desorption. And in microbial activity soils of 31–40 years old, P desorption significantly decreased T‐P and A‐P concentrations (p < 0.05). P sorption process and enzyme activity explained 35.10% and 22.20% of P fraction variation, respectively; and P desorption process and enzyme activity explained 48.3% and 22.3% of P fraction variation, respectively. These findings provide valuable insights into the contribution of P kinetics coupled with microbial activity in desert ecosystems, aiding in the effective management of these fragile ecosystems.

中文翻译：

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磷吸附-解吸改变了沙漠植被恢复时间序列中的磷分数动态

了解土壤磷（P）吸附和解吸的特征对于理解磷生物地球化学循环和有效管理沙漠植被恢复时序中的生态系统至关重要。本研究利用Freundlich模型和酶活性来表征P吸附-解吸特征和微生物活性，旨在阐明P动力学和微生物活性对沙漠植被恢复土壤中P组分的影响时序，包括11、31、40、57 和 65 年的重新植被沙漠。研究结果显示，31年土壤表现出最高的碱性磷酸单酯酶和磷酸二酯酶活性，40年土壤表现出最高的无机焦磷酸酶活性。在恢复植被的沙漠土壤中，微生物活动通过降低或增加吸附/解吸能量位点、磷吸附/解吸能力和磷吸附/解吸最大缓冲能力等参数来改变磷吸附-解吸动力学。在 31-40 年的微生物活性土壤中，磷解吸显着降低了 T-P 和 A-P 浓度（p< 0.05）。 P吸附过程和酶活性分别解释了P分数变化的35.10%和22.20%； P解吸过程和酶活性分别解释了P分数变化的48.3%和22.3%。这些发现为了解沙漠生态系统中磷动力学与微生物活动的贡献提供了宝贵的见解，有助于有效管理这些脆弱的生态系统。