scholarly journals Three Decades of Divergent Land Use and Plant Community Change Alters Soil C and N Content in Tallgrass Prairie

2020 ◽  
Vol 125 (8) ◽  
Author(s):  
R. Kent Connell ◽  
Jesse B. Nippert ◽  
John M. Blair
Keyword(s):  
Land Use ◽  
Plant Community ◽  
Tallgrass Prairie ◽  
Community Change ◽  
N Content ◽  
Soil C ◽  
Soil C And N ◽  
C And N

scholarly journals Using Diffuse Reflectance Spectroscopy as a High Throughput Method for Quantifying Soil C and N and Their Distribution in Particulate and Mineral-Associated Organic Matter Fractions

2021 ◽  
Vol 9 ◽  
Author(s):  
Paulina B. Ramírez ◽  
Francisco J. Calderón ◽  
Michelle Haddix ◽  
Emanuele Lugato ◽  
M. Francesca Cotrufo
Keyword(s):  
Land Use ◽  
Organic Matter ◽  
High Throughput ◽  
Diffuse Reflectance ◽  
N Content ◽  
Soil C ◽  
Mir Spectroscopy ◽  
C Pools ◽  
Soil C And N ◽  
C And N

Large-scale quantification of soil organic carbon (C) and nitrogen (N) stocks and their distribution between particulate (POM) and mineral-associated (MAOM) organic matter is deemed necessary to develop land management strategies to mitigate climate change and sustain food production. To this end, diffuse reflectance mid-infrared spectroscopy (MIR) coupled with partial least square (PLS) analysis has been proposed as a promising method because of its low labor and cost, high throughput and the potential to estimate multiple soil attributes. In this paper, we applied MIR spectroscopy to predict C and N content in bulk soils, and in POM and MAOM, as well as soil properties influencing soil C storage. A heterogeneous dataset including 349 topsoil samples were collected under different soil types, land use and climate conditions across the European Union and the United Kingdom. The samples were analyzed for various soil properties to determine the feasibility of developing MIR-based predictive calibrations. We obtained accurate predictions for total soil C and N content, MAOM C and N content, pH, clay, and sand (R2> 0.7; RPD>1.8). In contrast, POM C and N content were predicted with lower accuracies due to non-linear dependencies, suggesting the need for additional calibration across similar soils. Furthermore, the information provided by MIR spectroscopy was able to differentiate spectral bands and patterns across different C pools. The strength of the correlation between C pools, minerals, and C functional groups was land use-dependent, suggesting that the use of this approach for long-term soil C monitoring programs should use land-use specific calibrations.

Decoupled Soil Labile Carbon and Nitrogen Dynamics Triggered by Urban Vegetation

2021 ◽  
Author(s):  
Xiaolin Dou ◽  
Meng Lu ◽  
Liding Chen
Keyword(s):  
Land Use ◽  
Urban Forest ◽  
Urban Ecosystems ◽  
Isotopic Analysis ◽  
C Sequestration ◽  
Bare Soil ◽  
N Dynamics ◽  
Soil C ◽  
Soil C And N ◽  
C And N

Abstract Purpose Studies about soil carbon (C) and nitrogen (N) dynamics with land use change are urgently needed for urban ecosystems. We used fractionation of soils combined with stable isotopic analysis to examine soil C and N cycles after decadal forest and lawn planting in the Pearl River Delta, China. Methods Soil samples from bare soil (CK) and four land use treatments (55 and 20 years of forest plantation, F-55 and F-20; 55 and 20 years of lawn plantation, L-55 and L-20) were split into different chemical fractions. Then we analyzed the C and N contents, C/N ratio, δ13C and δ15N, C and N recalcitrant indices (RIC, RIN), and a C pool management index (CPMI).Results Forest vegetation substantially enhanced soil organic carbon (SOC) caused by the recalcitrant (RC) and labile C (LC) pools, while the larger soil organic nitrogen (SON) was ascribed to the increased recalcitrant N (RN). Enhanced LC but minor changes in labile N (LN) suggested a decoupled C and N in labile fractions of the forest soils. In contrast, the larger LN, and the enhanced decomposition of SOC, indicated that the lawns may have inhibited N mineralization of labile pools, also suggesting a decoupled C and N turnover and leading to low RIN values. Conclusions Urban forest and lawn plantations significantly changed the soil C and N dynamics, and emphasized the inconsistency between C and N processes, especially in labile pools, which would eventually lead to minor changes in N and limit the ecosystem C sequestration.

scholarly journals Land-Use Change on Soil C and N Stocks in the Humid Savannah Agro-Ecological Zone of Ghana

2022 ◽  
Vol 13 (01) ◽  
pp. 32-68
Author(s):  
Johnny Kofi Awoonor ◽  
Fowzia Adiyah ◽  
Bright Fafali Dogbey
Keyword(s):  
Land Use ◽  
Land Use Change ◽  
Ecological Zone ◽  
Soil C ◽  
Soil C And N ◽  
C And N

Soil C and N Content Under Evolving Landscapes in an Arid Inland River Basin of Northwest China

2004 ◽  
Vol 19 (6) ◽  
pp. 621-629 ◽  
Author(s):  
Wang Genxu ◽  
Yao Jinzhong ◽  
Luo Lin ◽  
Qian Ju
Keyword(s):  
River Basin ◽  
Northwest China ◽  
N Content ◽  
Soil C ◽  
Inland River ◽  
Inland River Basin ◽  
Soil C And N ◽  
C And N

Soil aggregate stability and soil organic matter fractions under agropastoral systems established in native savanna

Soil Research ◽  
1996 ◽  
Vol 34 (6) ◽  
pp. 891 ◽  
Author(s):  
AJ Gijsman
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Aggregate Stability ◽  
Aggregate Size ◽  
Soil Disturbance ◽  
N Content ◽  
Soil C ◽  
Size Classes ◽  
Soil C And N ◽  
C And N

An area of native savanna on an Oxisol in the Eastern Plains of Colombia was opened and sown to various rotations of grass or grass-legume pasture with rice. After 4.5 years, the soil was sampled for studying the effect of land conversion on soil aggregation and on the distribution of total and particulate soil organic matter across the aggregate size classes. The size distribution of undisturbed aggregates did not vary among treatments. Five different methods were used to measure wet aggregate stability (WAS). The choice of method affected the WAS average across treatments as well as the differences among treatments. The only consistent observation was the lower WAS under monocropped rice compared with the other treatments. Inclusion of a legume in a pasture hardly affected aggregate stability. In contrast to the WAS measurements, which were carried out with soil aggregates of 1-2 mm, wet sieving of whole-soil samples revealed additional differences among treatments: large macroaggregates (>2 mm) proved less stable under those treatments that involved soil disturbance through ploughing and harvesting. Total soil C and N content did not vary among treatments, despite considerable differences in plant production levels. The C concentration, but not the N concentration, declined with decreasing aggregate size. The distribution of whole-soil C and N content across aggregate size classes depended more on the amount of soil in a certain size class than on the size class's C or N concentration. Those treatments that involved frequent soil disturbance had a smaller fraction of large macroaggregates (>2 mm) and, as a consequence, less C and N in the large macroaggregate fraction. The particulate organic matter (POM) fraction accounted for only 6.2-8.5% of total soil carbon. The small size of this pool makes it unlikely that POM can serve in these Oxisols for estimating the amount of soil organic matter with medium turnover rate, as suggested by others.

scholarly journals Soil nitrogen-hydrolyzing enzyme activity and stoichiometry following a subtropical land use change

2021 ◽  
Author(s):  
Qian Zhang ◽  
Dandan Zhang ◽  
Junjun Wu ◽  
Jinsheng Li ◽  
Jiao Feng ◽  
...  
Keyword(s):  
Land Use ◽  
Enzyme Activity ◽  
Land Use Change ◽  
Soil Nitrogen ◽  
Enzyme Activities ◽  
Specific Enzyme ◽  
Soil C ◽  
Soil C And N ◽  
C And N

Afforestation; Soil ecoenzymatic C: N: P; Specific enzyme activities; Soil C and N contents.

scholarly journals Carbon and nitrogen dynamics in native Leymus chinensis grasslands along a 1000 km longitudinal transect in northeast China

2014 ◽  
Vol 11 (8) ◽  
pp. 12159-12182 ◽  
Author(s):  
L. Ma ◽  
C. Guo ◽  
S. Yuan ◽  
R. Wang
Keyword(s):  
Water Availability ◽  
Root Biomass ◽  
Northeastern China ◽  
Leymus Chinensis ◽  
Precipitation Regime ◽  
N Content ◽  
Soil C ◽  
C And N Mineralization ◽  
Soil C And N ◽  
C And N

Abstract. The unprecedented variations in global precipitation regime could profoundly impact terrestrial ecosystem structure and function, with consequent feedback to climatic change. However, little is known about complexity in precipitation effects on grassland ecosystem carbon (C) and nitrogen (N) processes at regional scales. We investigated the patterns of shoot and root biomass, litter mass, soil C and N content, microbial community composition and C and N mineralization at 18 sites along a 1000 km precipitation gradient in native Leymus chinensis grasslands of northeastern China. The results show that, with increasing mean annual precipitation (MAP), the biomass of total plant, shoot and litter gradually increased while root biomass remained nearly constant along the gradient. Surprisingly, both soil C and N mineralization rates showed quadratic relationships with MAP, likely due to the relative changes in temperature, soil arbuscular mycorrhizal fungi biomass and N availability. Although soil total C and N content presented sustained increases with water availability, heavy fractions of C and N content reached stable and saturated phases in mesic sites. Overall, ecosystem C and N sequestration enhanced with water availability in terms of C and N storage in shoot, root, litter, and soil along the precipitation gradient. It was concluded from the current study that regional precipitation regime and the indirect effects of precipitation on changes in soil properties and microbial communities would strongly influence on ecosystem C and N dynamics. The temperate grasslands of northeastern China could be utilized as significant ecosystem C and N sinks in the context of mitigating climate change.

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