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Mycorrhizal fungi mitigate nitrogen losses of an experimental grassland by facilitating plant uptake and soil microbial immobilization

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Pedosphere 2024年第2期34卷 399-410页

作者： Yangyang JIA Marcel G.A.VAn DER HEIJDEn Alain Y.VALZAnO-HELD Markus JOCHER Florian WALDER Postdoctoral Mobile Station of Ecology College of Ecology and EnvironmentXinjiang UniversityÜrümqi 830046China Research Group Plant-Soil Interactions AgroscopeZürich 8046Switzerland Research Group Climate and Agriculture AgroscopeZürich 8046Switzerland Department of Plant and Microbial Biology University of ZürichZürich 8008Switzerland Research Group Soil Quality and Soil Use AgroscopeZürich 8046Switzerland

nitrogen(n)is one of the most limited nutrients of terrestrial ecosystems,whose losses are prevented in tightly coupled cycles in finely tuned *** change-induced n enrichment through atmospheric deposition and application of vast amounts of fertilizer are now challenging the terrestrial n *** mycorrhizal fungi(AMF)are known drivers of plant-soil nutrient fluxes,but a comprehensive assessment of AMF involvement in n cycling under global change is still ***,we simulated n enrichment by fertilization(low/high)in experimental grassland microcosms under greenhouse conditions in the presence or absence of AMF and continuously monitored different n pathways over nine *** found that high n enrichment by fertilization decreased the relative abundance of legumes and the plant species dominating the plant community changed from grasses to forbs in the presence of AMF,based on aboveground *** presence of AMF always maintained plant n:phosphorus(P)ratios between 14 and 16,no matter how the soil n availability *** in plant n:P ratios due to the increased plant n and P uptake might thus be a primary pathway of AMF altering plant community ***,we constructed a comprehensive picture of AMF’s role in n cycling,highlighting that AMF reduced n losses primarily by mitigating n leaching,while n_(2)O emissions played a marginal *** mycorrhizal fungi reduced n_(2)O emissions directly through the promotion of n_(2)O-consuming *** underlying mechanism for reducing n leaching is mainly the AMF-mediated improved nutrient uptake and AMF-associated microbial *** results indicate that synergies between AMF and other soil microorganisms cannot be ignored in n cycling and that the integral role of AMF in n cycling terrestrial ecosystems can buffer the upcoming global changes.

关键词： n cycling n enrichment n uptake n:P ratio plant community structure symbiotic soil fungi

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Characteristics of nutrients in the Jiulong River and its impact on Xiamen Water, China

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Chinese Journal of Oceanology and Limnology 2013年第5期31卷 1055-1063页

作者：陈宝红暨卫东陈金民林彩黄海宁霍云龙纪贤标 Third Institute of Oceanography State Oceanic Administration College of Information Science and Technology Xiamen University

Water samples were collected at 20 sites on 4 occasions in 2009 （twice in May, and once in both August and november） along the Jiulong River, South China to examine how nutrient inputs from the Jiulong River could affect the nutrient status of the Xiamen Water. Samples were analyzed for nitrite （nO2-n）, nitrate （nO3-n）, ammonium （nH4-n）, phosphate （PO4-P）, silicate （SiO3-Si）, salinity, and temperature, to determine the nutrient and trophic status of the river. The results indicate that nutrients are derived mainly from river runoff. nO3-n was the main form of DIn in most parts of the river. In addition, nO3-n, DIn, and SiO3-Si behave conservatively. There is a surplus of DIn and SiO3-Si in the river, and PO4-P is a limitation on phytoplankton growth. The concentration of DIn is typically above 0.60 mg/dm3, and higher than 1.00 mg/dm3 in most parts of the river. The concentration of PO4-P is typically above 0.02 mg/dm3, while the concentration of SiO3-Si is higher than 1.00 rag/din3. Between 2003 and 2008, samples were collected 3 times per year （May, August and november） at 27 sites in the Xiamen Water and analyzed for nO2-n, nO3-n, nH4-n, PO4-P, salinity, and temperature. We discovered that the Jiulong River was the key source of DIn into the Xiamen Water, but not PO4-P, indicating the reason of the n/P molar ratio imbalance in the Xiamen Water. In the future, the effects of high DIn concentrations on the phytoplankton communities and marine ecosystems of the Xiamen Water shall be studied.

关键词： nutrient molar ratio eutrophication n enrichment the Jiulong River

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