An underground tale: contribution of microbial activity to plant iron acquisition via ecological processes

Chong Wei Jin; Yi Quan Ye; Shao Jian Zheng

doi:10.1093/aob/mct249

River flow controls ecological processes and invertebrate assemblages in subsurface flowpaths of an ephemeral river reach

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/f08-075 ◽

2008 ◽

Vol 65 (8) ◽

pp. 1532-1544 ◽

Cited By ~ 22

Author(s):

Thibault Datry ◽

Scott T. Larned

Keyword(s):

Microbial Activity ◽

River Flow ◽

Riparian Zone ◽

Taxon Richness ◽

Ecological Processes ◽

Zone Length ◽

Nutrient Sources ◽

Subsurface Zones ◽

Invertebrate Assemblages ◽

Reactive Phosphorus

We present the first measurements of solutes, invertebrates, and microbial activity in the semi-perched hyporheic, parafluvial, and riparian flowpaths of an ephemeral river channel. Dissolved organic carbon (DOC), nitrogen (DON), and phosphorus (DOP) concentrations decreased as water from an adjacent river mainstem moved through the flowpaths. DOC, DON, and DOP processing rates decreased with increasing mainstem flow and increased with parafluvial zone length. These patterns suggest that the surface water zones of perched river systems are organic nutrient sources to subsurface flowpaths and that parafluvial zones of these systems are strong sinks for organic matter. No longitudinal changes were detected in NO3–concentrations, and relationships between NO3–processing and hydrological variables were not significant. NO3–concentrations were uniformly high, and microbial activity and DOC and dissolved reactive phosphorus (DRP) concentrations were low, suggesting that biological NO3–removal was carbon- or phosphorus-limited. Invertebrate assemblages also varied between subsurface zones: density and taxon richness in the hyporheic and parafluvial zones were higher than in the riparian zone, and evenness was higher in the riparian zone than in the hyporheic or parafluvial zones. Distinct invertebrate assemblages in riparian zones may reflect greater hydrologic stability compared with hyporheic and parafluvial zones.

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The central role of microbial activity for iron acquisition in maize and sunflower

Biology and Fertility of Soils ◽

10.1007/s003740050021 ◽

2000 ◽

Vol 30 (5-6) ◽

pp. 433-439 ◽

Cited By ~ 130

Author(s):

J. Masalha ◽

H. Kosegarten ◽

Ö. Elmaci ◽

K. Mengel

Keyword(s):

Microbial Activity ◽

Iron Acquisition

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Microbial activity in the benthic boundary layer: Small-scale distribution and its relationship to the hydrodynamic regime

Netherlands Journal of Sea Research ◽

10.1016/s0077-7579(96)90047-2 ◽

1996 ◽

Vol 36 (3-4) ◽

pp. 171-180 ◽

Cited By ~ 2

Author(s):

W Ritzrau

Keyword(s):

Boundary Layer ◽

Microbial Activity ◽

Hydrodynamic Regime ◽

Small Scale ◽

Benthic Boundary Layer

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Inferring ecological processes underlying the latitudinal diversity gradient in New World swallowtail butterflies (Papilio, Heraclides, andPterourus)

10.1603/ice.2016.109466 ◽

2016 ◽

Author(s):

Hannah L Owens

Keyword(s):

New World ◽

Ecological Processes ◽

Latitudinal Diversity Gradient ◽

Diversity Gradient ◽

Swallowtail Butterflies

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Adoption Decision and Sustainable Utilization of Soil Conservation Technologies: Empirical Evidence from North West Ethiopia

JOURNAL OF ADVANCES IN AGRICULTURE ◽

10.24297/jaa.v10i0.8283 ◽

2019 ◽

Vol 10 ◽

pp. 1853-1863

Author(s):

Kassaye Gurebiyaw Legese ◽

Taye Melese ◽

Tadie Mire ◽

Abebe Birara ◽

Kefale Eniyew

Keyword(s):

Water Conservation ◽

Soil Conservation ◽

Sampling Technique ◽

Household Survey ◽

Ecological Processes ◽

Related Factors ◽

Severe Problem ◽

North West ◽

Household Heads ◽

North Gondar Zone

Soil is a crucial and precious natural resource that govern numerous ecological processes. However, in Ethiopia particularly in north Gondar zone, soil erosion is a severe problem and a major cause of the decline of agricultural productivity. The adoption and diffusion of soil and water conservation practices (SWC), as a way to tackle this challenge, has become an important issue in the development policy agenda in the zone. Therefore, this study was to identify factors affecting Soil conservation investments in the North Gondar zone. Data was collected through interviewed schedule, filed observation and focus group discussion. The multistage sampling technique was employed to select 206 sample households. Both descriptive and econometrics model was used to analyze the collected data. A multivariate profit (MPV) model was used to analyze the effect of demographic, socioeconomic, market, institutional and biophysical related factors on the interdependent investment decisions of SWC practices using household survey. The MPV model analysis indicates that farmers invest a combination of practices at parcel level by considering substitution and complementarity effects of the practices. The results also revealed that age of household heads, literacy status of household heads, off-farm activity, distance of farmlands from homesteads, tropical livestock unit, and access to training were influence farmers’ investments in SWC practices. The overall results indicate that the identified physical, socioeconomic, and institutional factors influence promote or hinder investments in SWC practice so, policymakers should take into consideration these various factors in designing and implementing SWC policies and Programmers.

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