The Effect of Four Types of Broad-Leaved Trees on Soil C and N Storage and Mineralization in Forest Areas of Noor City

The importance of labile soil carbon (C) and nitrogen (N) in soil biogeochemical processes is now well recognized. However, the quantification of labile soil C and N in soils and the assessment of their contribution to ecosystem C and N budgets is often constrained by limited information on spatial variability. To address this, we examined spatial variability in dissolved organic carbon (DOC) and dissolved total nitrogen (DTN) in a Sitka spruce forest in central Ireland. The results showed moderate variations in the concentrations of DOC and DTN based on the mean, minimum, and maximum, as well as the coefficients of variation. Residual values of DOC and DTN were shown to have moderate spatial autocorrelations, and the nugget sill ratios were 0.09% and 0.10%, respectively. Distribution maps revealed that both DOC and DTN concentrations in the study area decreased from the southeast. The variability of both DOC and DTN increased as the sampling area expanded and could be well parameterized as a power function of the sampling area. The cokriging technique performed better than the ordinary kriging for predictions of DOC and DTN, which are highly correlated. This study provides a statistically based assessment of spatial variations in DOC and DTN and identifies the sampling effort required for their accurate quantification, leading to improved assessments of forest ecosystem C and N budgets.

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Impacts of irrigation on soil C and N stocks in grazed grasslands depends on aridity and irrigation duration

Geoderma ◽

10.1016/j.geoderma.2021.115109 ◽

2021 ◽

Vol 399 ◽

pp. 115109

Author(s):

Paul L. Mudge ◽

Jamie Millar ◽

Jack Pronger ◽

Alesha Roulston ◽

Veronica Penny ◽

...

Keyword(s):

Soil C ◽

Soil C And N ◽

C And N

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C and N urban soil budget and its spatial differentiation in comparison with natural areas in the Wroclaw region of Poland

E3S Web of Conferences ◽

10.1051/e3sconf/20184500085 ◽

2018 ◽

Vol 45 ◽

pp. 00085

Author(s):

Izabela Sówka ◽

Yaroslav Bezyk ◽

Maxim Dorodnikov

Keyword(s):

Urban Soil ◽

Spatial Differentiation ◽

Clay Content ◽

Dry Mass ◽

Microbial Biomass C ◽

Natural Areas ◽

Soil C ◽

Soil C And N ◽

C And N ◽

Natural Grassland

An assessment of C and N balance in urban soil compared to the natural environment was carried out to evaluate the influence of biological processes along with human-induced forcing. Soil C and N stocks were quantified on the samples (n=18) collected at 5 - 10 cm depth from dominated green areas and arable lands in the city of Wroclaw (Poland) and the relatively natural grassland located ca. 36 km south-west. Higher soil carbon and nitrogen levels (C/N ratio = 11.8) and greater microbial biomass C and N values (MBC = 95.3, MBN = 14.4 mg N kg-1) were measured in natural grassland compared with the citywide lawn sites (C/N ratio = 15.17, MBC = 84.3 mg C kg-1, MBN = 11.9 mg N kg-1), respectively. In contrast to the natural areas, the higher C and N concentration was measured in urban grass dominated soils (C = 2.7 % and N = 0.18 % of dry mass), which can be explained mainly due to the high soil bulk density and water holding capacity (13.8 % clay content). The limited availability of soil C and N content was seen under the arable soil (C = 1.23 %, N = 0.13 %) than in the studied grasslands. In fact, the significantly increased C/N ratios in urban grasslands are largely associated with land conversion and demonstrate that urban soils have the potential to be an important reservoir of C.

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Comparison of carbon and nitrogen storage in mineral soils of graminoid and shrub tundra sites, western Greenland

Arctic Science ◽

10.1139/as-2015-0023 ◽

2016 ◽

Vol 2 (4) ◽

pp. 165-182 ◽

Cited By ~ 5

Author(s):

Chelsea L. Petrenko ◽

Julia Bradley-Cook ◽

Emily M. Lacroix ◽

Andrew J. Friedland ◽

Ross A. Virginia

Keyword(s):

Vegetation Type ◽

Mineral Soil ◽

Biotic Interactions ◽

The Arctic ◽

Soil C ◽

N Storage ◽

C Storage ◽

Arctic Soils ◽

C Pools ◽

C And N

Shrub species are expanding across the Arctic in response to climate change and biotic interactions. Changes in belowground carbon (C) and nitrogen (N) storage are of global importance because Arctic soils store approximately half of global soil C. We collected 10 (60 cm) soil cores each from graminoid- and shrub-dominated soils in western Greenland and determined soil texture, pH, C and N pools, and C:N ratios by depth for the mineral soil. To investigate the relative chemical stability of soil C between vegetation types, we employed a novel sequential extraction method for measuring organo-mineral C pools of increasing bond strength. We found that (i) mineral soil C and N storage was significantly greater under graminoids than shrubs (29.0 ± 1.8 versus 22.5 ± 3.0 kg·C·m−2 and 1.9 ± .12 versus 1.4 ± 1.9 kg·N·m−2), (ii) chemical mechanisms of C storage in the organo-mineral soil fraction did not differ between graminoid and shrub soils, and (iii) weak adsorption to mineral surfaces accounted for 40%–60% of C storage in organo-mineral fractions — a pool that is relatively sensitive to environmental disturbance. Differences in these C pools suggest that rates of C accumulation and retention differ by vegetation type, which could have implications for predicting future soil C pool storage.

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