Soil organic carbon and soil aggregate stability associated with aggregate fractions in a chronosequence of citrus orchards plantations

2021 ◽  
Vol 293 ◽  
pp. 112847
Author(s):  
Sheng Cao ◽  
Yuzhou Zhou ◽  
Yaoyu Zhou ◽  
Xuan Zhou ◽  
Weijun Zhou
Keyword(s):  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Aggregate Stability ◽  
Soil Aggregate ◽  
Soil Aggregate Stability ◽  
Aggregate Fractions ◽  
Citrus Orchards

scholarly journals Dynamics of Soil Organic Carbon and Labile Carbon Fractions in Soil Aggregates Affected by Different Tillage Managements

2021 ◽  
Vol 13 (3) ◽  
pp. 1541
Author(s):  
Xiaolin Shen ◽  
Lili Wang ◽  
Qichen Yang ◽  
Weiming Xiu ◽  
Gang Li ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Soil Aggregates ◽  
Aggregate Stability ◽  
Soil Aggregate ◽  
No Tillage ◽  
Labile Carbon ◽  
Carbon Fractions ◽  
Soil Aggregate Stability ◽  
Positive Effects

Our study aimed to provide a scientific basis for an appropriate tillage management of wheat-maize rotation system, which is beneficial to the sustainable development of agriculture in the fluvo-aquic soil areas in China. Four tillage treatments were investigated after maize harvest, including rotary tillage with straw returning (RT), deep ploughing with straw returning (DP), subsoiling with straw returning (SS), and no tillage with straw mulching (NT). We evaluated soil organic carbon (SOC), dissolved organic carbon (DOC), permanganate oxidizable carbon (POXC), microbial biomass carbon (MBC), and particulate organic carbon (POC) in bulk soil and soil aggregates with five particle sizes (>5 mm, 5–2 mm, 2–1 mm, 1–0.25 mm, and <0.25 mm) under different tillage managements. Results showed that compared with RT treatment, NT treatment not only increased soil aggregate stability, but also enhanced SOC, DOC, and POC contents, especially those in large size macroaggregates. DP treatment also showed positive effects on soil aggregate stability and labile carbon fractions (DOC and POXC). Consequently, we suggest that no tillage or deep ploughing, rather than rotary tillage, could be better tillage management considering carbon storage. Meanwhile, we implied that mass fractal dimension (Dm) and POXC could be effective indicators of soil quality, as affected by tillage managements.

scholarly journals Nitrogen addition increases the contents of glomalin-related soil protein and soil organic carbon but retains aggregate stability in a Pinus tabulaeformis forest

2018 ◽  
Author(s):  
Lipeng Sun ◽  
Guoliang Wang ◽  
Hang Jing ◽  
Guobin Liu
Keyword(s):  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Geometric Mean ◽  
Aggregate Stability ◽  
Soil Aggregate ◽  
Pinus Tabulaeformis ◽  
N Addition ◽  
Short Term ◽  
Aggregate Fractions ◽  
Soil Protein

Background: Glomalin-related soil protein (GRSP) and soil organic carbon (SOC) contribute to the formation and stability of soil aggregates, but the mechanism by which global atmospheric nitrogen (N) deposition changes soil aggregate stability when it alters the distribution of GRSP and SOC in different aggregate fractions remains unknown. Methods: We used a gradient N addition (0–9 g N–2 y–1) in Pinus tabulaeformis forest for 2 years in northeast China and then examined the changes in SOC contents, total GRSP (T-GRSP), and easily extractable GRSP (EE-GRSP) contents in three soil aggregate fractions (macro-aggregate: >250 μm, micro-aggregate: 250–53 μm, and clay–silt aggregate: <53 μm) and their relationship with aggregate stability. Results: (1) The soil was dominated by macro-aggregates. Short term N addition had no significant effect on mean weight diameter (MWD) and geometric mean diameter (GMD). (2) GRSP varied among aggregate fractions, and N addition had variable effects on the distribution of GRSP in aggregate fractions. The EE-GRSP content in the macro-aggregates increased initially and then decreased with increasing N addition levels, having a peak value of 0.480 mg/g at 6 g N–2 y–1. The micro-aggregates had the lowest EE-GRSP content (0.148 mg/g) at 6 g N–2 y–1. Furthermore, the T-GRSP content significantly increased in the aggregate fractions with the N addition levels. (3) The macro-aggregate had the highest SOC content, followed by the micro-aggregate and the clay–silt aggregate had the lowest SOC content. N addition significantly increased the SOC content in all the aggregate fractions. (4) GRSP and SOC contents were not significantly correlated with MWD. Conclusion: The distributions of GRSP and SOC varied with aggregate fractions. GRSP and SOC contents increased by N addition, but this increase did not enhance aggregate stability in short term, and the improvement of stability might depend on binding agents and incubation time.

scholarly journals Nitrogen addition increases the contents of glomalin-related soil protein and soil organic carbon but retains aggregate stability in a Pinus tabulaeformis forest

PeerJ ◽  
2018 ◽  
Vol 6 ◽  
pp. e5039 ◽  
Author(s):  
Lipeng Sun ◽  
Hang Jing ◽  
Guoliang Wang ◽  
Guobin Liu
Keyword(s):  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Aggregate Stability ◽  
Soil Aggregate ◽  
Pinus Tabulaeformis ◽  
N Addition ◽  
Short Term ◽  
Fine Material ◽  
Aggregate Fractions ◽  
Soil Protein

Background Glomalin-related soil protein (GRSP) and soil organic carbon (SOC) contribute to the formation and stability of soil aggregates, but the mechanism by which global atmospheric nitrogen (N) deposition changes soil aggregate stability by altering the distribution of GRSP and SOC in different aggregate fractions remains unknown. Methods We used a gradient N addition (0–9 g N m−2 y−1) in Pinus tabulaeformis forest for two years in northeast China and then examined the changes in SOC contents, total GRSP (T-GRSP), and easily extractable GRSP (EE-GRSP) contents in three soil aggregate fractions (macro-aggregate: >250 μm, micro-aggregate: 250–53 μm, and fine material: <53 μm) and their relationship with aggregate stability. Results (1) The soil was dominated by macro-aggregates. Short term N addition had no significant effect on mean weight diameter (MWD) and geometric mean diameter (GMD). (2) GRSP varied among aggregate fractions, and N addition had different effects on the distribution of GRSP in aggregate fractions. The EE-GRSP content in the macro-aggregates increased initially and then decreased with increasing N addition levels, having a peak value of 0.480 mg g−1 at 6 g N m−2 y−1. The micro-aggregates had the lowest EE-GRSP content (0.148 mg g−1) at 6 g N m−2 y−1. Furthermore, the T-GRSP content significantly increased in the aggregate fractions with the N addition levels. (3) The macro-aggregate had the highest SOC content, followed by the micro-aggregate and the fine material had the lowest SOC content. N addition significantly increased the SOC content in all the aggregate fractions. (4) GRSP and SOC contents were not significantly correlated with MWD. Conclusion Glomalin-related soil protein and SOC contents increased by N addition, but this increase did not enhance aggregate stability in short term, and the improvement of stability might depend on binding agents and incubation time.

scholarly journals Effects of Soil Aggregate Stability on Soil Organic Carbon and Nitrogen under Land Use Change in an Erodible Region in Southwest China

2019 ◽  
Vol 16 (20) ◽  
pp. 3809 ◽  
Author(s):  
Man Liu ◽  
Guilin Han ◽  
Qian Zhang
Keyword(s):  
Land Use ◽  
Organic Carbon ◽  
Land Use Change ◽  
Soil Organic Carbon ◽  
Southwest China ◽  
Aggregate Stability ◽  
Soil Aggregate ◽  
Soil Erodibility ◽  
Agricultural Abandonment ◽  
Soil Aggregate Stability

Soil aggregate stability can indicate soil quality, and affects soil organic carbon (SOC) and soil organic nitrogen (SON) sequestration. However, for erodible soils, the effects of soil aggregate stability on SOC and SON under land use change are not well known. In this study, soil aggregate distribution, SOC and SON content, soil aggregate stability, and soil erodibility were determined in the soils at different depths along the stages following agricultural abandonment, including cropland, abandoned cropland, and native vegetation land in an erodible region of Southwest China. Soil aggregation, soil aggregate stability, and SOC and SON content in the 0–20 cm depth soils increased after agricultural abandonment, but soil texture and soil erodibility were not affected by land use change. Soil erodibility remained in a low level when SOC contents were over 20 g·kg−1, and it significantly increased with the loss of soil organic matter (SOM). The SOC and SON contents increased with soil aggregate stability. This study suggests that rapidly recovered soil aggregate stability after agricultural abandonment promotes SOM sequestration, whereas sufficient SOM can effectively maintain soil quality in karst ecological restoration.

scholarly journals Nitrogen addition increases the contents of glomalin-related soil protein and soil organic carbon but retains aggregate stability in a Pinus tabulaeformis forest

2018 ◽  
Author(s):  
Lipeng Sun ◽  
Guoliang Wang ◽  
Hang Jing ◽  
Guobin Liu
Keyword(s):  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Geometric Mean ◽  
Aggregate Stability ◽  
Soil Aggregate ◽  
Pinus Tabulaeformis ◽  
N Addition ◽  
Short Term ◽  
Aggregate Fractions ◽  
Soil Protein

Background: Glomalin-related soil protein (GRSP) and soil organic carbon (SOC) contribute to the formation and stability of soil aggregates, but the mechanism by which global atmospheric nitrogen (N) deposition changes soil aggregate stability when it alters the distribution of GRSP and SOC in different aggregate fractions remains unknown. Methods: We used a gradient N addition (0–9 g N–2 y–1) in Pinus tabulaeformis forest for 2 years in northeast China and then examined the changes in SOC contents, total GRSP (T-GRSP), and easily extractable GRSP (EE-GRSP) contents in three soil aggregate fractions (macro-aggregate: >250 μm, micro-aggregate: 250–53 μm, and clay–silt aggregate: <53 μm) and their relationship with aggregate stability. Results: (1) The soil was dominated by macro-aggregates. Short term N addition had no significant effect on mean weight diameter (MWD) and geometric mean diameter (GMD). (2) GRSP varied among aggregate fractions, and N addition had variable effects on the distribution of GRSP in aggregate fractions. The EE-GRSP content in the macro-aggregates increased initially and then decreased with increasing N addition levels, having a peak value of 0.480 mg/g at 6 g N–2 y–1. The micro-aggregates had the lowest EE-GRSP content (0.148 mg/g) at 6 g N–2 y–1. Furthermore, the T-GRSP content significantly increased in the aggregate fractions with the N addition levels. (3) The macro-aggregate had the highest SOC content, followed by the micro-aggregate and the clay–silt aggregate had the lowest SOC content. N addition significantly increased the SOC content in all the aggregate fractions. (4) GRSP and SOC contents were not significantly correlated with MWD. Conclusion: The distributions of GRSP and SOC varied with aggregate fractions. GRSP and SOC contents increased by N addition, but this increase did not enhance aggregate stability in short term, and the improvement of stability might depend on binding agents and incubation time.

scholarly journals Rice-husk biochar effects on organic carbon, aggregate stability and nitrogen-fertility of coarse-textured Ultisols evaluated using Celosia argentea growth

2021 ◽  
Vol 18 (2) ◽  
pp. 177
Author(s):  
Nancy E. Ebido ◽  
Ifeoma G. Edeh ◽  
Benedict O. Unagwu ◽  
Ogorchukwu V. Ozongwu ◽  
Sunday Ewele Obalum ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Plant Height ◽  
Aggregate Stability ◽  
Tropical Soils ◽  
Soil Aggregate ◽  
Soil Aggregate Stability ◽  
Nitrogen Fertility ◽  
Celosia Argentea ◽  
Rice Husk Biochar

There are insufficient data supporting the enormous potential of biochar in highly weathered tropical soils. This glasshouse study assessed rice-husk biochar (RHB) effects on soil organic carbon, aggregate stability and nitrogen fertility of sandy-loam Ultisols which were evaluated using spinach (<em>Celosia argentea</em>) growth. Five RHB rates 0, 5, 10, 20, and 40 g per two-kg-soil (0, 7.5, 15, 30 and 60 t ha<sup>−1</sup>, respectively) were studied under 0, 4, 8, and 12 weeks of incubation (WOI). Batched potting of treatments enabled sowing on one date. Treatment effects on soil quality were assessed at sowing and spinach growth six weeks later. Soil organic carbon generally increased with RHB rate, with the greatest increments (37%) in maximum rate relative to no-biochar control for 8 WOI. Aggregate stability also generally increased with RHB rate, the range being 7.21%-17.21% for 8 WOI, beyond which it decreased in 10 and 20 but not 40 g pot<sup>–1</sup>. Total nitrogen was always highest in maximum rate, increasing with rate only for 8 WOI. Treatment affected plant height more clearly than leaf count. Optimum rates were 5 or 10 g pot<sup>–1</sup> for 8 and 4 WOI, respectively (plant height) and 10 g pot<sup>–1</sup> for 8 WOI (leaf count). Soil organic carbon influenced soil aggregate stability (R<sup>2</sup> = 0.505) which in turn was quadratically related to plant height (R<sup>2</sup> = 0.517), indicating stability threshold for spinach. Adding RHB at 40 g pot<sup>–1</sup> (≈ 60 t ha<sup>−1</sup>) to coarse-textured tropical soils is suggested to sustain its soil aggregating effect beyond the growth phase of short-cycle leafy vegetables which require a lower rate (10 g pot<sup>–1</sup>) 8 weeks before sowing. The observed role of soil aggregate stability in spinach growth rather than the overall effects of RHB should guide further search for edapho-agronomic optimum rate of RHB.

Medium-term Effects of Mineral Fertilizer and Organic Amendments on Aggregate and Soil Organic Carbon and Nitrogen Dynamics in Rhizosphere and Bulk Soil

2021 ◽  
Author(s):  
Wenhai Mi ◽  
Taotao Zha ◽  
Qiang Gao ◽  
Haitao Zhao
Keyword(s):  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Organic Amendments ◽  
Aggregate Stability ◽  
Mineral Fertilizer ◽  
Soil Aggregate ◽  
Bulk Soil ◽  
Medium Term ◽  
Soil Aggregate Stability ◽  
Carbon And Nitrogen

Abstract Soil aggregate stability is one of the important physical properties affecting rice (Oryza sativa L.) production and soil sustainability. This study was undertaken to evaluate the influence of different medium-term fertilization regimes on soil aggregate stability and aggregate associated carbon and nitrogen in rhizosphere and bulk soil. This experiment consisted of three treatments including mineral fertilizer alone (NPK), mineral fertilizer plus rice straw (NPK + RS), and controlled-release blended fertilizer plus cattle manure (CRF + CM). The results showed that bulk soil contained higher mean weight diameter (MWD) than in rhizosphere soil at the rice jointing and maturity stages. Compared to the NPK alone, combined application of NPK with organic amendments improved the proportion of > 0.25 mm macroaggregate, soil organic carbon (SOC), total nitrogen (TN) concentrations, and MWD in both rhizosphere and bulk soil. In rhizosphere, the proportion of macroaggregate was significantly positively (p < 0.01) correlated with root biomass while had no significant correlations with SOC in all sizes aggregates. By contrast, bulk soil had a significantly (p < 0.01) positive relationship between the proportion of > 2 mm class and organic C associated with smaller particle-size aggregates (0.25–2 mm and < 0.25 mm). During the rice-growing season, the highest MWD value was observed at the jointing stage except for the NPK + RS treatment in bulk soil. Overall, the results suggested that the medium-term application of mineral fertilizer with organic amendments is beneficial to improve soil aggregate stability and C and N accumulation.

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