Soil Inorganic Carbon Stocks in Terrestrial Biomes

Lorenz, Klaus; Lal, Rattan

doi:10.1007/978-3-030-95193-1_4

Cited by 3 publications

(1 citation statement)

References 61 publications

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“…Maintaining higher levels of SOC is an indicator of good soil health [13] that increases soil fertility [14], whereas the loss of SOC contributes to soil and land degradation [15,16], global Land 2024, 13, 378 2 of 15 warming [17], and negative effects on soil functions [15]. Therefore, SOC is considered a key environmental indicator for several global environmental issues, including land degradation, and food security [18,19].…”

Section: Introductionmentioning

confidence: 99%

Spatial Distribution of Soil Organic Carbon in the Forests of Nepal

Malla,

Neupane

2024

Land

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Soil organic carbon (SOC) is the major constituent of the soil organic matter. SOC stocks are determined by several factors such as altitude, slope, aspect, canopy cover, and vegetation type. Using the Third National Forest Inventory (2010–2014) data of Nepal, we assessed SOC status in forests at a national scale for the better understanding of the SOC distribution within Nepal. In this study, we estimated SOC against different factors and tested the spatial distribution of SOC using analysis of variance (ANOVA). The results showed that the forests located at a higher altitude have higher SOC accumulation. In particular, broadleaved forests exhibit a higher amount of carbon stock compared to other forest types. Moreover, forests with a larger canopy cover, located on a higher slope, and with a cooler aspect are associated with a higher accumulation of SOC. The SOC stock in the forest varies according to altitude, slope, aspect, canopy cover, and forest type, which might be attributed to the change in the microclimate of the area. The significant increase in SOC amount with the increase in slope, altitude, and crown cover helps to understand the extent of SOC distribution in forests. Broadleaved forests with a larger canopy cover in the higher altitude region have a higher SOC retention potential, which is likely to contribute to mitigating the impacts of climate change by sinking more carbon into the soil.

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Section: Introductionmentioning

confidence: 99%

Spatial Distribution of Soil Organic Carbon in the Forests of Nepal

Malla,

Neupane

2024

Land

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Soil profile distribution of organic, inorganic, and labile carbon and nitrogen fractions vary in semi‐arid drylands under long‐term conservation tillage systems

Badrari,

Ghimire,

Aryal

et al. 2024

Soil Use and Management

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Changes in soil carbon (C) and nutrients considerably influence soil health and agricultural sustainability. However, how agricultural management affects C and N allocation among various soil organic matter pools and their linkages with soil health are not clear for arid and semi‐arid regions. This study aimed to evaluate the soil profile distribution of selected C and N fractions and associated soil health properties in conventional tillage (CT), no‐tillage (NT), and strip tillage (ST) fields and quantify the relationship of labile and inorganic C and N fractions to soil organic carbon (SOC) sequestration in semi‐arid dryland cropping systems. Crop rotation was a 4‐year cycle of corn (Zea mays L.)—sorghum (Sorghum bicolor L. Moench)—winter wheat (Triticum aestivum L.)—fallow across all tillage systems. Soil samples were collected from 0–20, 20–40, and 40–60 cm depths of each plot in July 2022, after 9 years of plot establishment, and analysed for potentially mineralizable carbon (PMC), microbial biomass carbon (MBC), SOC, soil inorganic (SIC), soil total carbon (STC), soil inorganic nitrogen (SIN), total labile nitrogen (TLN), total organic nitrogen (SON), and labile organic nitrogen (LON) and other soil health indicators. The results indicate that PMC was 31% more and LON was 23% more in NT than in CT, whilst ST resulted in lower pH and had only 10%, 9%, and 24% more SON, STN, and LON, respectively, than CT in 0–60 cm profile. The SIC stock was negatively correlated with MBC, PMC, SON, STN, LON, TLN, and SIN, whilst positively correlated with depth, STC, and pH. After 9 years of conservation tillage, whilst depth‐wise distribution varied among tillage systems, soil C sequestration rate was negative in the 0–60 cm profile under both NT and ST compared with CT, mainly owing to more SIC accumulation in deeper depth of conventional system. These results show the complexity of soil C and N allocation under different tillage systems, with NT and ST supporting greater C and N storage in the surface soil and CT supporting more C and N storage in the deeper depth. Soil biological activity indicators appear to drive surface SOC accumulation, whilst soil pH and N availability influenced SIC accumulation in lower depths.

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Elevation gradient drives distribution of soil carbon in a semiarid grassland of British Columbia

et al. 2023

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A sequence of Brown, Dark Brown and Black Chernozems spanning a 600 m elevation gradient in a semiarid bunchgrass ecosystem (Lac du Bois Grassland) near Kamloops, British Columbia was first described in 1961. More soil organic carbon (SOC) at higher elevations along the sequence was attributed to increasing effective precipitation with increasing elevation. Since the 1961 study, plant community composition has shifted towards the desired climax community due to improved livestock management instituted in the 1970s; however, changes in soil carbon stocks remain unknown. The objective of this study was to quantify SOC and SIC (soil inorganic carbon) stocks using the same site selection criteria as used in 1961. SOC stocks (kg m-2 ± SD; 0-60 cm) were similar for Brown (5.73±1.7) and Dark Brown Chernozems (5.87±0.76) but increased sharply (10.11±2.5) for the higher elevation Black Chernozems. SIC increased with depth in all three soil zones, representing 33-50% of total C from the 30-60 cm soil depth. To evaluate changes in SOC (0-20 cm) from the 1961 measurements, three different approaches for calculating SOC stocks were used based on the inclusion or exclusion of coarse fragments. Results varied across the three soil zones from no change to a 20% increase in the Brown, an increase of 7% to a reduction of 26% in the Dark Brown, and a decrease of 12 to 35% in the Black soil zone. Information about soil coarse fragments and the distribution of SOC and SIC stocks within the soil profile is crucial for accurate comparisons across studies or resampling events.

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Soil Inorganic Carbon Stocks in Terrestrial Biomes

Cited by 3 publications

References 61 publications

Spatial Distribution of Soil Organic Carbon in the Forests of Nepal

Spatial Distribution of Soil Organic Carbon in the Forests of Nepal

Soil profile distribution of organic, inorganic, and labile carbon and nitrogen fractions vary in semi‐arid drylands under long‐term conservation tillage systems

Elevation gradient drives distribution of soil carbon in a semiarid grassland of British Columbia

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