The balance between arbuscular mycorrhizal fungal diversity and plant growth benefits from optimizing nitrogen inputs in agroecosystems

Sun, Jianni; Zhao, Jiao; Huo, Jusong; Wang, Shuai; Xu, Ling; Chen, Xiaoyun; Qiu, Yunpeng; Liu, Manqiang

doi:10.1016/j.apsoil.2023.104834

Cited by 3 publications

(1 citation statement)

References 46 publications

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“…Yang, Schroeder-Moreno et al, 2018). In addition, under PCG-KC treatment, biological N fixation by KC could possibly be the reason for reduced dependence on AM fungal associations for N uptake as indicated by Sun et al (2023). It is important to note that our study did not directly measure the biological N fixation.…”

Section: Influence Of Treatments On Soil Microbial Biomass and Activi...mentioning

confidence: 88%

Intercropping prairie cordgrass with kura clover had little effect on soil biogeochemistry

Varikuti,

Bansal,

et al. 2024

Soil Science Soc of Amer J

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Intercropping kura clover (Trifolium ambiguum) (KC) with prairie cordgrass (Spartina pectinata) (PCG) has great potential for biofuel feedstock on marginal lands. This study evaluated the impacts of 10‐year PCG‐KC intercropping and PCG monoculture fertilized with different nitrogen (N) rates of granular urea (five treatments: PCG‐KC, PCG‐0N, PCG‐75N, PCG‐150N, and PCG‐225N) on soil biogeochemical properties: (i) in the surface soil (0‐ to 10‐cm depth) at three different sampling times during the crop growing season: spring (April, pre‐emergence), summer (June, active growth), and fall (November, post‐harvest); and (ii) at different soil depths (0–5, 5–15, 15–30, 30–45, and 45–60 cm) (only total carbon (C) and N) in fall 2021. All soil biogeochemical parameters were higher during summer as compared to spring and/or fall, except urease activity, ammonium‐N, microbial biomass C and N, and fluorescein diacetate (FDA). On average over the sampling times, PCG‐KC had significantly higher β‐glucosidase activity and hot‐water extractable organic N than PCG‐0N; but no significant difference between PCG‐KC and N‐fertilized PCG. Cold‐water extractable organic N was significantly lower than the highest N rate, but not significantly different from PCG‐0N and lower N rate treatments. Urease activity under PCG‐KC treatment was double that of PCG‐0N and PCG‐75N; FDA was higher in PCG‐KC than all monocultures. No treatment effect was found on soil total C and N, except that they decreased with depth. Overall, intercropping PCG‐KC showed some benefits in terms of promoting soil biogeochemical properties during crop growth periods, having lower residual reactive N in the soil, and maintaining biomass yield and quality on marginal lands.

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Section: Influence Of Treatments On Soil Microbial Biomass and Activi...mentioning

confidence: 88%

Intercropping prairie cordgrass with kura clover had little effect on soil biogeochemistry

Varikuti,

Bansal,

et al. 2024

Soil Science Soc of Amer J

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Mycorrhiza

Rigobelo

2024

Microbial Services for Cereal Crops

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Increased dependence on nitrogen-fixation of a native legume in response to alien plant invasion

Han,

Zhang,

Liu

et al. 2023

Preprint

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Background and aims Inhibition of nutrient acquisition by roots or their symbiotic microorganisms, such as mycorrhizal fungi and rhizobium, is an important for the success of alien plants invasion. However, we know little about how the invasive and native plants interact regarding the ‘quantity’ and ‘activity’ of the strategies, both of which are essential for plant nutrient acquisition. Methods Here we conducted a pot experiment by monoculture and mixed plantings of an invasive plant, Xanthium strumarium, and a widespread native legume, Glycine max, and a suite of traits of fine roots and nodules as well as mycorrhizal colonization were measured. Results Compared with monoculture, fine root ‘quantity’ (biomass, and surface area) and ‘activity’ (root nitrogen (N) concentration and acid phosphatase activity) of G. max both decreased in mixture plantings; nodule ‘quantity’ (biomass) decreased by 45%, while nodule N-fixing ‘activity’ (nifH gene copies) increased by 106%; mycorrhizal colonization rate remained unchanged. Contribution of N-fixation to leaf N content (%Ndfa) in G. max increased after mixed plantings; this arised from lowered rhizosphere soil N of G. max in mixed planting. Increased root ‘quantity’ and ‘activity’ together with higher mycorrhizal colonization rate of X. strumarium was observed in the mixed planting. Conclusion Although the legume plant can produce plenty of N resource through N-fixing of nodules, the invasive plant does not scavenge nutrients directly from N-fixing nodules, but rather deplete rhizosphere soil N of the legume crop through root strategy of the invasive plant, thereby inhibiting native root strategy while enhancing N-fixation ‘activity’.

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The balance between arbuscular mycorrhizal fungal diversity and plant growth benefits from optimizing nitrogen inputs in agroecosystems

Cited by 3 publications

References 46 publications

Intercropping prairie cordgrass with kura clover had little effect on soil biogeochemistry

Intercropping prairie cordgrass with kura clover had little effect on soil biogeochemistry

Mycorrhiza

Increased dependence on nitrogen-fixation of a native legume in response to alien plant invasion

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