scholarly journals Nitrogen addition alters elemental stoichiometry within soil aggregates in a temperate steppe

2016 ◽  
Author(s):  
Jinfei Yin ◽  
Ruzhen Wang ◽  
Heyong Liu ◽  
Xue Feng ◽  
Zhuwen Xu ◽  
...  
Keyword(s):  
Soil Aggregates ◽  
Terrestrial Ecosystems ◽  
Nitrogen Addition ◽  
Soil Aggregate ◽  
Soil Parameters ◽  
Available Phosphorus ◽  
Elemental Stoichiometry ◽  
Aggregate Fractions ◽  
Anthropogenic Nitrogen ◽  
Soil Aggregate Fractions

Abstract. Ongoing increases in anthropogenic nitrogen (N) inputs have largely affected soil carbon (C) and nutrients cycling in most terrestrial ecosystems. Numerous studies have concerned the effects of elevated N inputs on soil dissolved organic carbon (DOC), dissolved inorganic N (DIN), available phosphorus (AP), exchangeable calcium (Ca) and magnesium (Mg), and available iron (Fe) and manganese (Mn). However, little has emphasized on stoichiometric traits of these soil parameters, especially within different soil aggregate fractions. In a semi-arid grassland of Inner Mongolia, we studied effect of N addition on the ratios of DOC : DIN, DOC : AP, DIN : AP, exchangeable Ca:Mg, available Fe : Mn within three soil aggregate classes of large macroaggregates (> 2000 μm), small macroaggregates (250–2000 μm), and microaggregates (

scholarly journals Nitrogen addition alters elemental stoichiometry within soil aggregates in a temperate steppe

Solid Earth ◽  
2016 ◽  
Vol 7 (6) ◽  
pp. 1565-1575 ◽  
Author(s):  
Jinfei Yin ◽  
Ruzhen Wang ◽  
Heyong Liu ◽  
Xue Feng ◽  
Zhuwen Xu ◽  
...  
Keyword(s):  
Soil Aggregates ◽  
Nutrient Retention ◽  
Terrestrial Ecosystems ◽  
Nitrogen Addition ◽  
Soil Aggregate ◽  
Soil Parameters ◽  
Available Phosphorus ◽  
N Addition ◽  
Retention Capacity ◽  
Elemental Stoichiometry

Abstract. Ongoing increases in anthropogenic nitrogen (N) inputs have largely affected soil carbon (C) and nutrient cycling in most terrestrial ecosystems. Numerous studies have concerned the effects of elevated N inputs on soil dissolved organic carbon (DOC), dissolved inorganic N (DIN), available phosphorus (AP), exchangeable calcium (Ca) and magnesium (Mg), and available iron (Fe) and manganese (Mn). However, few have emphasized the stoichiometric traits of these soil parameters, especially within different soil aggregate fractions. In a semiarid grassland of Inner Mongolia, we studied the effect of N addition on the ratios of DOC : DIN, DOC : AP, DIN : AP, exchangeable Ca : Mg, available Fe : Mn within three soil aggregate classes of large macroaggregates (> 2000 µm), small macroaggregates (250–2000 µm), and microaggregates (< 250 µm). Elevated N inputs significantly decreased the DOC : DIN ratio within three soil aggregates. The soil DOC : AP ratio significantly decreased along with increasing N gradients within large macroaggregates and microaggregates. Nitrogen significantly decreased the ratio of exchangeable Ca : Mg within soil macroaggregates. The ratio of available Fe : Mn decreased with N addition within three soil aggregate classes. Alteration of elemental stoichiometry within soil fractions that are characterized by different nutrient retention capacity will influence the chemical composition of soil microorganisms and plant quality.

scholarly journals Conversion of alpine pastureland to artificial grassland altered CO2 and N2O emissions by decreasing C and N in different soil aggregates

PeerJ ◽  
2021 ◽  
Vol 9 ◽  
pp. e11807
Author(s):  
Mei Zhang ◽  
Dianpeng Li ◽  
Xuyang Wang ◽  
Maidinuer Abulaiz ◽  
Pujia Yu ◽  
...  
Keyword(s):  
Land Use ◽  
Soil Aggregates ◽  
Soil Aggregate ◽  
Alpine Grassland ◽  
Aggregate Structure ◽  
Significant Difference ◽  
Aggregate Fractions ◽  
Soil Aggregate Fractions ◽  
Artificial Grassland ◽  
Natural Grassland

Background The impacts of land use on greenhouse gases (GHGs) emissions have been extensively studied. However, the underlying mechanisms on how soil aggregate structure, soil organic carbon (SOC) and total N (TN) distributions in different soil aggregate sizes influencing carbon dioxide (CO2), and nitrous oxide (N2O) emissions from alpine grassland ecosystems remain largely unexplored. Methods A microcosm experiment was conducted to investigate the effect of land use change on CO2and N2O emissions from different soil aggregate fractions. Soil samples were collected from three land use types, i.e., non-grazing natural grassland (CK), grazing grassland (GG), and artificial grassland (GC) in the Bayinbuluk alpine pastureland. Soil aggregate fractionation was performed using a wet-sieving method. The variations of soil aggregate structure, SOC, and TN in different soil aggregates were measured. The fluxes of CO2 and N2O were measured by a gas chromatograph. Results Compared to CK and GG, GC treatment significantly decreased SOC (by 24.9–45.2%) and TN (by 20.6–41.6%) across all soil aggregate sizes, and altered their distributions among soil aggregate fractions. The cumulative emissions of CO2 and N2O in soil aggregate fractions in the treatments of CK and GG were 39.5–76.1% and 92.7–96.7% higher than in the GC treatment, respectively. Moreover, cumulative CO2emissions from different soil aggregate sizes in the treatments of CK and GG followed the order of small macroaggregates (2–0.25 mm) > large macroaggregates (> 2 mm) > micro aggregates (0.25–0.053 mm) > clay +silt (< 0.053 mm), whereas it decreased with aggregate sizes decreasing in the GC treatment. Additionally, soil CO2 emissions were positively correlated with SOC and TN contents. The highest cumulative N2O emission occurred in micro aggregates under the treatments of CK and GG, and N2O emissions among different aggregate sizes almost no significant difference under the GC treatment. Conclusions Conversion of natural grassland to artificial grassland changed the pattern of CO2 emissions from different soil aggregate fractions by deteriorating soil aggregate structure and altering soil SOC and TN distributions. Our findings will be helpful to develop a pragmatic management strategy for mitigating GHGs emissions from alpine grassland.

Phosphorus cycling within soil aggregate fractions of a highly weathered tropical soil: A conceptual model

2018 ◽  
Vol 116 ◽  
pp. 91-98 ◽  
Author(s):  
Gina Garland ◽  
E.K. Bünemann ◽  
A. Oberson ◽  
E. Frossard ◽  
S. Snapp ◽  
...  
Keyword(s):  
Conceptual Model ◽  
Soil Aggregate ◽  
Tropical Soil ◽  
Phosphorus Cycling ◽  
Aggregate Fractions ◽  
Soil Aggregate Fractions

Manure application increases microbiome complexity in soil aggregate fractions: Results of an 18-year field experiment

2021 ◽  
Vol 307 ◽  
pp. 107249
Author(s):  
Guiping Ye ◽  
Samiran Banerjee ◽  
Ji-Zheng He ◽  
Jianbo Fan ◽  
Zonghua Wang ◽  
...  
Keyword(s):  
Field Experiment ◽  
Soil Aggregate ◽  
Manure Application ◽  
Aggregate Fractions ◽  
Soil Aggregate Fractions

scholarly journals Soil structure and carbon distribution in subsoil affected by vegetation restoration

2014 ◽  
Vol 60 (No. 1) ◽  
pp. 21-26 ◽  
Author(s):  
Zhao FZ ◽  
Han XH ◽  
Yang GH ◽  
Feng YZ ◽  
Ren GX
Keyword(s):  
Soil Depth ◽  
Soil Aggregate ◽  
Vegetation Restoration ◽  
Pinus Tabulaeformis ◽  
Soil Stability ◽  
Particle Size Fractions ◽  
Platycladus Orientalis ◽  
Aggregate Fractions ◽  
Test Soil ◽  
Soil Aggregate Fractions

The depth of sampling is an important factor for evaluating soil stability. The objective of this study was to test soil aggregate particle-size fractions and soil organic carbon (SOC) in water-stable aggregate by vegetation restoration through 0&ndash;60 cm soil profile. We collected soil samples in 30 years old Robinia psendoacacia (Rr); Platycladus orientalis (Po); Pinus tabulaeformis (Pt); abandoned land (Ab), and slope cropland (Sc), which were separated into &gt; 2, 2&ndash;1, 1&ndash;0.25, 0.25&ndash;0.053, and &lt; 0.053 mm fractions. The &gt; 0.25 mm water-stable aggregates (WSA) and mean weight diameter (MWD) were calculated in 0&ndash;60 cm soil depth. Results showed that soil aggregate fractions<br /> (&gt; 0.25 mm) of four vegetation types were significantly (P &lt; 0.05) higher in 40&ndash;60 cm soil depth under Po, Pt, and Ab compared with Sc and the SOC distribution in macro-aggregates (&gt; 0.25 mm) under Rr, Po, Pt, and Ab was higher more than 37.7, 92.4, 92.5, 79.1%, respectively in 40&ndash;60 cm compared with Sc additionally, &gt; 0.25 mm WSA and MWD was significantly higher in Pt soil in 20&ndash;40 cm, 40&ndash;60 cm soil depth (P &lt; 0.05). The results demonstrated that soil stability was enhanced and SOC content was increased after converting slope cropland to forest, especially under Pt forest that greatly influenced the subsoil.

Short-term effects of tillage practices on soil aggregate fractions in a Chinese Mollisol

2011 ◽  
Vol 61 (6) ◽  
pp. 535-542 ◽  
Author(s):  
Aizhen Liang ◽  
Neil B. McLaughlin ◽  
Xiaoping Zhang ◽  
Yan Shen ◽  
Xiuhuan Shi ◽  
...  
Keyword(s):  
Soil Aggregate ◽  
Short Term ◽  
Tillage Practices ◽  
Aggregate Fractions ◽  
Soil Aggregate Fractions ◽  
Short Term Effects

Organic matter mineralization in different soil aggregate fractions

2010 ◽  
Vol 43 (2) ◽  
pp. 141-148 ◽  
Author(s):  
V. M. Semenov ◽  
L. A. Ivannikova ◽  
N. A. Semenova ◽  
A. K. Khodzhaeva ◽  
S. N. Udal’tsov
Keyword(s):  
Organic Matter ◽  
Soil Aggregate ◽  
Organic Matter Mineralization ◽  
Aggregate Fractions ◽  
Soil Aggregate Fractions

scholarly journals Potential Effects of Microplastic on Arbuscular Mycorrhizal Fungi

2021 ◽  
Vol 12 ◽  
Author(s):  
Eva F. Leifheit ◽  
Anika Lehmann ◽  
Matthias C. Rillig
Keyword(s):  
Arbuscular Mycorrhizal Fungi ◽  
Mycorrhizal Fungi ◽  
Net Primary Production ◽  
Soil Aggregates ◽  
Arbuscular Mycorrhizal ◽  
Terrestrial Ecosystems ◽  
Root Diameter ◽  
Future Research ◽  
Soil Parameters ◽  
The Impact

Microplastics (MPs) are ubiquitously found in terrestrial ecosystems and are increasingly recognized as a factor of global change (GCF). Current research shows that MP can alter plant growth, soil inherent properties, and the composition and activity of microbial communities. However, knowledge about how microplastic affects arbuscular mycorrhizal fungi (AMF) is scarce. For plants it has been shown that microplastic can both increase and decrease the aboveground biomass and reduce the root diameter, which could indirectly cause a change in AMF abundance and activity. One of the main direct effects of microplastic is the reduction of the soil bulk density, which translates to an altered soil pore structure and water transport. Moreover, especially fibers can have considerable impacts on soil structure, namely the size distribution and stability of soil aggregates. Therefore, microplastic alters a number of soil parameters that determine habitat space and conditions for AMF. We expect that this will influence functions mediated by AMF, such as soil aggregation, water and nutrient transport. We discuss how the impacts of microplastic on AMF could alter how plants deal with other GCFs in the context of sustainable food production. The co-occurrence of several GCFs, e.g., elevated temperature, drought, pesticides, and microplastic could modify the impact of microplastic on AMF. Furthermore, the ubiquitous presence of microplastic also relates to earth system processes, e.g., net primary production (NPP), carbon and nitrogen cycling, which involve AMF as key soil organisms. For future research, we outline which experiments should be prioritized.

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