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草业学报 ›› 2025, Vol. 34 ›› Issue (5): 40-50.DOI: 10.11686/cyxb2024221

• 研究论文 • 上一篇    下一篇

菌磷配施对紫花苜蓿根系非结构碳水化合物及碳氮磷化学计量特征的影响

魏孔钦(), 张盈盈, 回金峰, 马春晖, 张前兵()   

  1. 石河子大学动物科技学院,新疆 石河子 832003
  • 收稿日期:2024-06-11 修回日期:2024-07-15 出版日期:2025-05-20 发布日期:2025-03-20
  • 通讯作者: 张前兵
  • 作者简介:E-mail: qbz102@163.com
    魏孔钦(1998-),男,甘肃榆中人,在读硕士。E-mail: 1609913844@qq.com
  • 基金资助:
    国家自然科学基金项目(32260347);新疆维吾尔自治区重点研发任务专项(2023B02031);国家现代农业产业技术体系资助

Effect of phosphate-solubilizing bacteria and phosphorus on non-structural carbohydrate content and the carbon∶nitrogen∶phosphorus stoichiometry of alfalfa roots

Kong-qin WEI(), Ying-ying ZHANG, Jin-feng HUI, Chun-hui MA, Qian-bing ZHANG()   

  1. College of Animal Science & Technology,Shihezi University,Shihezi 832003,China
  • Received:2024-06-11 Revised:2024-07-15 Online:2025-05-20 Published:2025-03-20
  • Contact: Qian-bing ZHANG

摘要:

为揭示磷肥配施解磷细菌对紫花苜蓿根系非结构碳水化合物及化学计量特征的影响,采用双因素完全随机设计,设置了2个施磷(P2O5)水平:0(P0)和100 mg·kg-1(P1),4个接菌处理:不接菌(J0)、单接种胶质芽孢杆菌(J1)、单接种巨大芽孢杆菌(J2)和混合接菌(J3),共8个处理。测定了紫花苜蓿的根系活力、可溶性糖、可溶性蛋白、淀粉、丙二醛、根际土-根系碳(C)、氮(N)、磷(P)含量。双因素方差分析表明:施磷和接菌处理显著改变了紫花苜蓿的根系活力、丙二醛、可溶性糖、淀粉含量、根际土N/P、根系C/N、C/P及N/P(P<0.05),但对根系可溶性蛋白的影响不显著(P>0.05)。进一步分析表明,在相同施磷水平下,与不接菌相比,接种解磷菌提高了紫花苜蓿的根系活力、可溶性糖、可溶性蛋白(除J2P0和J2P1)、淀粉(除J1P1)、根际土-根系C、N、P含量(除J2P1的根系C及J1P0和J2P0的根系N含量)及根际土C/P(除J3P0)和N/P,降低了根际土C/N及根系丙二醛含量(除J1P1和J2P1)。在相同接菌处理下,与不施磷相比,施磷处理提高了紫花苜蓿的根系活力、可溶性糖、可溶性蛋白、淀粉、根际土C、根际土P、根系N及P含量,降低了根系C/N、C/P、N/P、丙二醛及根际土N/P。综合分析表明,不同处理的综合得分依次为:J3P1>J2P1>J1P1>J0P1>J3P0>J2P0>J1P0>J0P0。综上,施磷(100 mg·kg-1)和混合接种胶质芽孢杆菌及巨大芽孢杆菌,可以有效提高紫花苜蓿根际土养分含量并促进根系非结构碳水化合物的积累。

关键词: 解磷细菌, 磷, 紫花苜蓿, 非结构碳水化合物, 化学计量特征

Abstract:

The aim of this study was to determine the effects of phosphorus fertilizer applied with phosphate-solubilizing bacteria on the non-structural carbohydrate content and stoichiometric characteristics of alfalfa (Medicago sativa) roots. An experiment with a two-factor completely randomized design was established with two phosphorus (P2O5) fertilizer levels: 0 (P0) and 100 mg·kg-1 (P1); and four inoculation treatments: no inoculation (J0), single inoculation with Bacillus mucilaginosus (J1), single inoculation with Bacillus megaterium (J2) and mixed inoculation (J3), making a total of eight treatments. The root vigor, contents of soluble sugars, soluble protein, starch, and malondialdehyde, and the contents of carbon (C), nitrogen (N) and phosphorus (P) in the rhizosphere soil and roots of alfalfa were determined. Two-way ANOVA showed that phosphorus application and bacterial inoculation significantly affected the root vigor, the contents of malondialdehyde, soluble sugars, and starch in the roots, rhizosphere soil N∶P, and root C∶N, C∶P, and N∶P (P<0.05), but did not significantly affect the root soluble protein content (P>0.05). Further analyses showed that at the same level of phosphorus application, inoculation with phosphate-solubilizing bacteria increased alfalfa root vigor, soluble sugar content, and soluble protein content (except for J2P0 and J2P1); increased root starch content (except for J1P1); increased rhizosphere soil and root C, N, and P contents (except for root C in J2P1 and root N content in J1P0 and J2P0); and increased rhizosphere soil C∶P (except for J3P0) and N∶P; but reduced the rhizosphere soil C∶N and root malondialdehyde content (except for J1P1 and J2P1). Under the same inoculation treatment, phosphorus application increased root vigor and the contents of soluble sugars, soluble protein, and starch in the roots, increased rhizosphere soil C and P and root N and P contents, and decreased root C∶N, C∶P, N∶P, malondialdehyde content, and rhizosphere soil N∶P, compared with their respective values in the no-phosphorus control. On the basis of these comprehensive analyses, the treatments could be ranked, from the highest composite score to lowest, as follows: J3P1>J2P1>J1P1>J0P1>J3P0>J2P0>J1P0>J0P0. In conclusion, phosphorus application (100 mg·kg-1) and mixed inoculation with B. mucilaginosus and B. megaterium effectively increased the nutrient content of alfalfa rhizosphere soil and increased the accumulation of non-structural carbohydrates in alfalfa roots.

Key words: phosphate-solubilizing bacteria, phosphorus, alfalfa, non-structural carbohydrates, stoichiometry