Nitrate Transport in the Unsaturated Zone

Bosompemaa, Patience; Peterson, Eric D.; Perry, Bill; Seyoum, Wondwosen M.

doi:10.1130/abs/2019am-339771

Cited by 1 publication

(1 citation statement)

References 42 publications

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“…For example, riparian soils intercept water resources and nutrients in rivers by regulating plant resource acquisition, soil conservation, and microbial fixation or slowly release downstream through hydrological processes, thereby forming natural nutrient and water gradients (Mitsch and Gosselink, 2000). Nevertheless, most of the current research on riparian zones has focused on the above-ground plant community composition and their distribution patterns (Acker et al, 2003;Bosompemaa et al, 2021;Qin et al, 2021). This unique natural environment also provides suitable conditions for microbial biogeography research and helps answer fundamental scientific questions in microbial ecology, such as the spatial distribution pattern of microbial communities and their maintaining mechanism.…”

Section: Introductionmentioning

confidence: 99%

Soil moisture and pH differentially drive arbuscular mycorrhizal fungal composition in the riparian zone along an alpine river of Nam Co watershed

Zhou

Chen²,

Muneer³

et al. 2022

Front. Microbiol.

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The riparian zone is an important ecological corridor connecting the upstream and downstream rivers. Its highly complex biological and physical environments significantly affect the biogeographical pattern of species and various ecosystem functions. However, in alpine riparian ecosystems, the distribution patterns and drivers of arbuscular mycorrhizal (AM) fungi, a group of functionally important root-associated microorganisms, remain poorly understood. In this study, we investigated the AM fungal diversity and community composition in near-bank (wetland) and far-bank (alpine meadows) soils along the Niaqu River in the Nam Co watershed, and assessed the relative importance of abiotic and biotic filtering in shaping these distributions. Overall, 184 OTUs were identified in the riparian ecosystem, predominantly belonging to the genus Glomus, especially in the downstream soils, and Claroideoglomus in near-bank soils. AM fungal colonization, spore density, and α diversity showed an overall increasing trend along the river, while the extraradical hyphae declined dramatically from the middle of the river. AM fungal communities significantly varied between the wetland and alpine meadows in the riparian zone, mainly driven by the geographic distance, soil water content, soil pH, and plant communities. Specifically, soil pH was the principal predictor of AM fungal community in near-bank wetland soils, while soil water content had a most substantial direct effect in alpine meadows. These findings indicate that abiotic factors are the most important divers in shaping AM fungal communities at the watershed scale, which could be helpful in alpine riparian biodiversity conservation and management.

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