The Impact of Sheep Grazing on Net Nitrogen Mineralization Rate in Two Temperate Salt Marshes

Kiehl, Kathrin; Esselink, Peter; Gettner, Sabine; Bakker, Jan P.

doi:10.1055/s-2001-17730

Cited by 26 publications

(24 citation statements)

References 27 publications

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“…Inorganic nitrogen showed higher contents in wetland soils during spring and early summer before water and sediment regulation, except for the tidal flooding wetland which might be greatly affected by tidal fluctuation. During this period, labile C and N were easily available from overwinter decomposition with increasing temperature 29. Then the inorganic N decreased after June because nitrogen was probably incorporated in plant biomass and immobilized by soil microbial biomass 30.…”

Section: Discussionmentioning

confidence: 99%

Soil Net Nitrogen Mineralization in Salt Marshes with Different Flooding Periods in the Yellow River Delta, China

Gao

Bai

Xiao

et al. 2012

CLEAN Soil Air Water

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Seasonal variation of inorganic nitrogen and net nitrogen mineralization of soils were investigated by using in situ incubation method in three wetlands with different flooding periods (i.e., short‐term, seasonal, and tidal flooding) in the Yellow River Delta, China. Results showed that N mineralization in short‐term and seasonal flooding wetlands could be classified into one group. Inorganic nitrogen showed higher concentrations during the period from spring to early summer, and then it decreased after June for short‐term and seasonal flooding wetlands. Net N mineralization rate appeared negative value but sequently increased and reached the positive maximum value during the period from late autumn to early winter. However, in tidal flooding wetland, both inorganic N and N mineralization rate kept relative constant. The effects of inundation due to water and sediment regulation were different on three wetlands. Inorganic N contents in soil decreased in short‐term and seasonal flooding wetlands whereas increased in tidal flooding wetland. The changing tendency of net N mineralization rate was opposite to that of ammonium rate.

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Section: Discussionmentioning

confidence: 99%

Soil Net Nitrogen Mineralization in Salt Marshes with Different Flooding Periods in the Yellow River Delta, China

Gao

Bai

Xiao

et al. 2012

CLEAN Soil Air Water

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“…Consequences of these activities include the incorporation into the lake basin of large amounts of agricultural soil, drained from ploughed fields during the rainy periods, concentration of fertilizers or pesticides in the lake, washed from adjacent treated fields, direct changes in soil structure as sheep step on the salt shores (Fig. 13e), and nitrification and vegetation changes by sheep activity (Kiehl et al 2001, Knisley 2011). Trails and dirt roads are used traditionally by agricultural vehicles (Fig.…”

Section: Discussionmentioning

confidence: 99%

Salt lakes of La Mancha (Central Spain): A hot spot for tiger beetle (Carabidae, Cicindelinae) species diversity

Rodríguez‐Flores¹,

Gutiérrez‐Rodríguez²,

Aguirre-Ruiz³

et al. 2016

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The tiger beetle assemblage of the wetlands of La Mancha (central Spain) comprises nine species: Calomera littoralis littoralis, Cephalota maura maura, Cephalota circumdata imperialis, Cephalota dulcinea, Cicindela campestris campestris, Cicindela maroccana, Cylindera paludosa, Lophyra flexuosa flexuosa, and Myriochila melancholica melancholica. This assemblage represents the largest concentration of tiger beetles in a single 1º latitude / longitude square in Europe. General patterns of spatial and temporal segregation among species are discussed based on observations of 1462 specimens registered during an observation period of one year, from April to August. The different species of Cicindelini appear to be distributed over space and time, with little overlapping among them. Three sets of species replace each other phenologically as the season goes on. Most of the species occupy drying or dried salt lakes and salt marshes, with sparse vegetation cover. Spatial segregation is marked in terms of substrate and vegetation use. Calomera littoralis and M. melancholica have been observed mainly on wet soils; C. circumdata on dry open saline flats; C. dulcinea and C. paludosa in granulated substrates with typical halophytic vegetation; C. maura is often present in man-modified areas. Cephalota circumdata and C. dulcinea are included as species of special interest in the list of protected species in Castilla-La Mancha. Conservation problems for the Cicindelini assemblage arise from agricultural activities and inadequate use of sport vehicles. Attempts at restoring the original habitat, supressing old semi-industrial structures, may affect the spatial heterogeneity of the lakes, and have an effect on Cicindelinae diversity.

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“…Trampling by livestock leads to compaction of the soil and, thus, decreased accretion (e.g. Kiehl et al 2001;Schrama et al 2013). Several studies have shown that defoliation alters vegetation composition and positively affects soil salinity (e.g.…”

Section: Salinization and Managementmentioning

confidence: 99%

Salinization during salt-marsh restoration after managed realignment

et al. 2015

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Salt marshes provide an important and unique habitat for plants and animals. To restore salt marshes, numerous coastal realignment projects have been carried out, but restored marshes often show persistent ecological differences from natural marshes. We evaluate the effects of elevation and marsh topography, which are in turn affected by drainage and livestock grazing, on soil salinity after de-embankment. Salinity in the topsoil was monitored during the first 10 years after de-embankment and compared with salinity in an adjacent reference marsh. Additionally, salinity at greater depths (down to 1.2 m below the marsh surface) was monitored during the first 4 years by measuring the electrical conductivity of the groundwater. Chloride concentration in the top soil strongly decreased with increasing elevation; however, it was not affected by marsh topography, i.e. distance to creek or breach. Chloride concentrations higher than 2 g Cl − /litre were found at elevations below 0.6 m + MHT. Salinization of the groundwater, however, took several years. At low marsh elevations, the salinity of the deep groundwater (at 1.2 m depth) increased slowly throughout the full 4-year period of monitoring but did not reach the level of seawater. Compared to the ungrazed treatment, the grazed treatment led to lower accretion rates, lower soil-moisture content and higher chloride content of soil moisture. The de-embankment of the agricultural grasslands resulted in a rapid increase of soil salinity, although deeper ground-water levels showed a much slower response. Elevation accounted for most of the variation in the salinization of the soil. Grazing may enhance salinity of the top soil.

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The Impact of Sheep Grazing on Net Nitrogen Mineralization Rate in Two Temperate Salt Marshes

Cited by 26 publications

References 27 publications

Soil Net Nitrogen Mineralization in Salt Marshes with Different Flooding Periods in the Yellow River Delta, China

Soil Net Nitrogen Mineralization in Salt Marshes with Different Flooding Periods in the Yellow River Delta, China

Salt lakes of La Mancha (Central Spain): A hot spot for tiger beetle (Carabidae, Cicindelinae) species diversity

Salinization during salt-marsh restoration after managed realignment

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