量化磷肥分布以及肥料和土壤残留磷对玉米磷吸收的贡献 - 32P 标签研究,Food and Energy Security

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量化磷肥分布以及肥料和土壤残留磷对玉米磷吸收的贡献 - 32P 标签研究
Food and Energy Security ( IF 4.0 ) Pub Date : 2023-07-03 , DOI: 10.1002/fes3.476
Dongfang Zheng ₁ , Huimin Yuan ₁ , Guojiang Yang ₂ , Gu Feng ₁ , Zed Rengel _{3,

4} , Jianbo Shen ₁

Affiliation

由于复杂的土壤磷固定过程，施用到土壤中的磷 (P) 肥料的有效性会迅速减少。然而，肥料磷在土壤磷组分中的定量分布尚不完全清楚。^{这里，使用32} P标记的 KH ₂ PO ₄在温室中进行了两个实验(i) 量化磷肥在对比土壤中生长的土壤部分、微生物和玉米芽中的分布；(ii) 表征种植玉米对土壤磷含量的影响，以及 (iii) 确定来自肥料与土壤的植物磷含量。根据土壤类型的不同，74.1%–84.1% 的标记磷保留在土壤中，11.4%–14.5% 存在于玉米芽中，0.7%–4.5% 存在于微生物中。施用的磷在土壤中磷组分的分布取决于土壤类型，大多数磷在红土中以 NaOH-Pi 和残留磷的形式存在，在潮土中以 HCl-P 的形式存在。根系介导的过程参与了所有三种土壤中残留磷的动员，其中红土中的 NaOH-Pi、黑土中的 NaOH-Pi 和 HCl-P 以及潮水土中的 HCl-P 显着消耗。土壤。在所有三种土壤中，来自肥料和土壤的植物磷随着磷添加率的增加而增加。在磷利用率低的土壤中，肥料为植物提供的磷多于土壤，而在最初磷含量高的土壤中，情况恰恰相反。总之，肥料磷在不同土壤磷组分中的分配取决于土壤类型，肥料磷对玉米磷吸收的贡献与土壤残留磷成反比。

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Quantifying phosphorus fertilizer distribution and the contribution of fertilizer and soil legacy phosphorus to phosphorus uptake by maize – A 32P-labelling study

The availability of phosphorus (P) fertilizer applied to soil can diminish rapidly because of the complex soil P immobilization processes. However, the quantitative distribution of fertilizer P in the soil P fractions is not fully understood. Here, two experiments were conducted in a greenhouse using ³²P-labelled KH₂PO₄ to (i) quantify the distribution of P fertilizer in soil fractions, microorganisms and maize shoots grown in contrasting soils; (ii) characterize the effect of planting maize on soil P fractions and (iii) determine the amount of plant P derived from fertilizer vs. soil. Depending on the soil type, 74.1%–84.1% of the labelled P was retained in the soil, 11.4%–14.5% was found in maize shoots and 0.7%–4.5% was present in microorganisms. Distribution of applied P in the soil P fractions was dependent on soil type, with most P present as NaOH-Pi and residual-P in the Red soil, and as HCl-P in the Fluvo-aquic soil. Root-mediated processes were involved in mobilisation of residual-P in all three soils, with significant depletion of NaOH-Pi in the Red soil, NaOH-Pi and HCl-P in the Black soil, and HCl-P in the Fluvo-aquic soil. The plant P derived from fertilizer and soil increased with increasing P addition rates in all three soils. In the soils with low-P availability, fertilizer contributed more P to plants than soil, whereas in the initially high-P soil, the opposite occurred. In conclusion, the partitioning of fertilizer P to various soil P fractions is dependent on the soil type, and the contribution of P derived from fertilizer to maize P uptake was related inversely to the soil legacy P.

更新日期：2023-07-03

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