Guangxi Key Laboratory of Agrio-Environment and Agric-Product Safety, National Demonstration Center for Experimental Plant Science Education, College of Agriculturo, Guangxi University, Nanning, Guangxi, 530004, People's Republic of China.
Environ Sci Pollut Res Int. 2022 Nov;29(52):79579-79593. doi: 10.1007/s11356-022-21480-8. Epub 2022 Jun 17.
Rhizosphere microorganisms can greatly affect plant growth, especially the plant growth-promoting rhizobacteria (PGPR), which can improve plant root development and growth because they contain various biological functions including nitrogen fixation, phosphate solubilization, and phytosiderophore production. This study demonstrates that Cyperus rotundus L. is capable of developing and forming complex underground reproductive systems at arbitrary burial depths and cutting modes due to its extremely strong multiplication and regeneration ability. With the densities of C. rotundus increasing, the abundance of PGPR, soil enzymes invertase and urease, the nutrient contents of the field soil, and maize quality were impacted. Notably, more abundance of PGPR-most notably, the nitrogen-fixing microorganisms (NFMs) such as Azospirillum, Burkholderia, Mycobacterium, and Rhizobium-enriches in the rhizosphere of C. rotundus than in that of maize. In addition, the activities of soil enzymes invertase (S_SC) and urease (S_SU) were significantly higher in its rhizosphere than in maize, further proving that more NFMs enrich the C. rotundus rhizosphere. The nutrient contents of the field soil of TN, SOM, and SOC were reduced, indicating that the presence of C. rotundus made the soil infertile. Hence, these pieces of evidence indicate that C. rotundus may drive the field soil infertile as reflected by reduced soil nutrients via altering rhizosphere bacteria community structure.
根际微生物可以极大地影响植物的生长，特别是植物促生根际细菌（PGPR），它们可以通过固氮、溶磷和产生植物铁载体等各种生物功能来促进植物根系的发育和生长。本研究表明，由于香蒲具有极强的繁殖和再生能力，它能够在任意埋藏深度和切割模式下发育和形成复杂的地下生殖系统。随着香蒲密度的增加，PGPR、土壤酶转化酶和脲酶、田间土壤养分含量和玉米质量受到影响。值得注意的是，香蒲根际中 PGPR（如固氮微生物）的丰度增加，尤其是固氮微生物如 Azospirillum、Burkholderia、Mycobacterium 和 Rhizobium 比玉米根际中的丰度更高。此外，香蒲根际土壤酶转化酶（S_SC）和脲酶（S_SU）的活性明显高于玉米，进一步证明更多的 NFMs 富集在香蒲根际中。田间土壤 TN、SOM 和 SOC 的养分含量减少，表明香蒲的存在使土壤贫瘠。因此，这些证据表明，香蒲可能通过改变根际细菌群落结构来驱动土壤贫瘠，从而导致土壤养分减少。
