Maize-soybean intercropping facilitates chemical and microbial transformations of phosphorus fractions in a calcareous soil.
Maize-soybean intercropping facilitates chemical and microbial transformations of phosphorus fractions in a calcareous soil.
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DOI：
10.3389/fmicb.2022.1028969
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发表时间：
2022
影响因子：
5.2
通讯作者：
Sui, Peng
中科院分区：
文献类型：
--
作者：
Liu, Jin;Li, Yang;Han, Chaoqun;Yang, Dongling;Yang, Jianjun;Cade-Menun, Barbara J. J.;Chen, Yuanquan;Sui, Peng
与单作相比，间作可显著提高植物对磷的有效性，这可能是土壤遗留磷恢复和农业生产的有效策略。然而，植物，微生物和土壤之间的土壤地球化学相互作用，动员磷在间作系统仍然在很大程度上未知。通过盆栽试验，采用连续提取法和Illumina MiSeq测序法研究了石灰性土壤中玉米-大豆间作条件下无机磷（Pi）和有机磷（Po）的化学和生物转化机制。与单作相比，玉米-大豆间作通过活化Ca 2-Pi（碳酸氢盐（NaHCO 3）提取）、Al-Pi/Po（氟化铵（NH 4F）提取）和Fe-Pi（氢氧化钠和碳酸钠（NaOH-Na 2CO 3）提取）组分，显著提高了两种作物对磷的吸收。与单作相比，玉米-大豆间作土壤有机碳含量、碱性磷酸单酯酶（ALP）和磷酸二酯酶（PDE）活性以及微管藻属（Microvirga）、溶杆菌属（Lysobacter）、新月藻属（Microlunatus）和鞘氨醇单胞菌属（Sphingomonas）的丰度均显著增加。与单作相比，玉米-大豆间作对土壤pH值没有显著影响。因此，玉米-大豆间作对磷素的吸收可能是根际有机碳存款、ALP和PDE活性增加以及与土壤磷素形态相关的微生物（Microvirga、Lysobacter、Microlunatus和Sphingomonas）的协同作用的结果，但不存在普遍认为的根际酸化现象。此外，所选择的细菌属在大豆根际表现出更紧密的网络相比，玉米，这表明在大豆根际细菌之间的相互作用增强。研究结果为玉米-大豆间作恢复土壤残留磷提供了理论依据。
Intercropping often substantially increases phosphorus (P) availability to plants compared with monocropping, which could be an effective strategy for soil legacy P recovery and agricultural production. However, the biogeochemical interactions among plants, microbes, and soil that mobilize P remain largely unknown in intercropping systems. Pot experiments with maize-soybean intercropping in a calcareous soil were conducted to investigate the potential chemical and biological transformation mechanisms of inorganic P (Pi) and organic P (Po) using sequential extraction and Illumina MiSeq sequencing. Compared to monocropping of each crop, maize-soybean intercropping significantly enhanced total P uptake of the two crops by mobilizing Ca2-Pi [extracted by bicarbonate (NaHCO3)], Al-Pi/Po [extracted by ammonium fluoride (NH4F)] and Fe-Pi [extracted by sodium hydroxide and sodium carbonate (NaOH-Na2CO3)] fractions. Furthermore, there were significant increases in the organic carbon content and alkaline phosphomonoesterase (ALP) and phosphodiesterase (PDE) activities as well as the abundances of Microvirga, Lysobacter, Microlunatus and Sphingomonas under maize-soybean intercropping relative to monocropping. In contrast, compared to monocroppping, no significant change in the soil pH was observed under maize-soybean intercropping. Therefore, the enhanced P uptake of the maize-soybean intercropping probably resulted from a synergistic effect of rhizosphere organic carbon deposit, increased activities of ALP and PDE, together with the bacteria (Microvirga, Lysobacter, Microlunatus and Sphingomonas) which showed correlation with soil P forms, while the generally recognized rhizosphere acidification was excluded in this investigated calcareous soil. Moreover, the selected bacterial genera exhibited a closer network in the rhizosphere of soybean compared to maize, suggesting enhanced interactions among bacteria in the soybean rhizosphere. These results provide theoretical bases for the recovery of soil legacy P by maize-soybean intercropping.
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DOI：
10.1073/pnas.0704591104
发表时间：
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影响因子：
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