Water-Stable Aggregates and Associated Carbon in a Subtropical Rice Soil Under Variable Tillage

Ou, Haiyan; Liu, Xihui; Chen, Qiu-Shi; Yin-hui, Huang; He, Mingzhu; Tan, Hao; Xu, Fu-Liu; Li, Yang–Rui; Gu, Minghong

doi:10.1590/18069657rbcs20150145

Cited by 12 publications

(22 citation statements)

References 34 publications

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“…Ou et al. (2016) indicated that the conversion from CT to MT increased SOC storage by increasing the formation and stabilization of aggregates, followed by increased physical protection of SOC within aggregates under the double rice systems. Our results with MT agreed with the findings of Jiang et al.…”

Section: Discussionmentioning

confidence: 99%

Cropping diversity with rice influences soil aggregate formation and nutrient storage under different tillage systems

Jahangir

Jahiruddin

Akter

et al. 2020

J. Plant Nutr. Soil Sci.

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Background: The soils under continuous rice monocropping are currently facing a serious threat of accelerated soil and environmental quality degradation. Aims: Examining the impact of tillage and cropping diversity on soil aggregate stability and associated nutrients in a sub‐tropical rice ecosystem. Methods: A split‐plot experiment with tillage (minimum, MT vs. conventional, CT) as a main plot and cropping diversity [mustard (Brassica napus)–rice (Oryza sativa)–rice (M–R–R), wheat (Triticum aestivum)–rice–rice (W–R–R), and lentil (Lens esculenta)–rice–rice (L–R–R)] as a sub‐plot was repeated for four years. Soil aggregate properties were measured using wet sieving techniques. Soil organic carbon (SOC) and nutrients were measured in different aggregate size groups as well as in the bulk soil samples. Results: Results show that all the aggregate size groups were similar in both MT and CT, except in 0.85–0.30 mm. Likewise, cropping diversities increased soil aggregation, being higher aggregate size of < 0.053 mm in M–R–R relative to the W–R–R and L–R–R, where the latter two were alike. By contrast, > 2 mm aggregates were higher in L–R–R than in M–R–R and W–R–R, where the latter two were similar. The MT increased aggregate mean weight diameter (MWD) by 14% in W–R–R, and by 29% in L–R–R. Soil organic carbon (SOC), total N (TN), and available P were higher in MT than in CT, while it was alike for exchangeable K and available S. While W–R–R had a higher aggregate‐associated SOC, available P, and available S, L–R–R had a higher TN, and M–R–R had a higher exchangeable K. While SOC, TN, and exchangeable K accumulated more in the > 0.85 mm size aggregates, the available P, in contrast, accumulated more in < 0.85 mm size aggregates. Conclusion: Wheat–rice–rice diversity, coupled with minimum tillage, has a higher potential for soil fertility sustenance and crop productivity through better nutrient protection.

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Section: Discussionmentioning

confidence: 99%

Cropping diversity with rice influences soil aggregate formation and nutrient storage under different tillage systems

Jahangir

Jahiruddin

Akter

et al. 2020

J. Plant Nutr. Soil Sci.

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“…Soil organic carbon (SOC) is of great importance for soil quality (Plaza-Bonilla et al, 2013;Yang et al, 2014;Yu et al, 2015;Yazdanpanah et al, 2016) and the sustainable development of the environment (Benbi et al, 2016;Ou et al, 2016). It is important to ensure the long-term sustainability of SOC in agro-ecosystems to maintain soil fertility (Liang et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Distribution of soil aggregates and organic carbon in deep soil under long-term conservation tillage with residual retention in dryland

et al. 2019

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To ascertain the effects of long-term conservation tillage and residue retention on soil organic carbon (SOC) content and aggregate distribution in a deep soil (>20-cm depth) in a dryland environment, this paper analyzed the SOC and aggregate distribution in soil, and the aggregate-associated organic carbon (OC) and SOC physical fractions. Conservation tillage (reduced tillage with residue incorporated (RT) and no-tillage with residue mulch (NT)) significantly increased SOC sequestration and soil aggregation in deep soil compared with conventional tillage with residue removal (CT). Compared with CT, RT significantly increased the proportion of small macroaggregates by 23%-81% in the 10-80 cm layer, and the OC content in small macroaggregates by 1%-58% in the 0-80 cm layer. RT significantly increased (by 24%-90%) the OC content in mineral-SOC within small macroaggregates in the 0-60 cm layer, while there was a 23%-80% increase in the 0-40 cm layer with NT. These results indicated that: (1) conservation tillage treatments are beneficial for soil aggregation and SOC sequestration in a deep soil in a dryland environment; and (2) the SOC in mineral-associated OC plays important roles in soil aggregation and SOC sequestration. In conclusion, RT with NT is recommended as an agricultural management tool in dryland soils because of its role in improving soil aggregation and SOC sequestration.

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“…Hui-Ping Ou et al, (2016) reported that the average humic and fulvic acids concentrations for all the aggregate size fractions was43.9% higher in NT-S than in MP-S, and 20.5% higher in NT+S than in MP+S in the 0.00-0.05 m layer. However, an opposite trend was observed in the 0.05-0.20 and 0.20-0.30 m layers.…”

Section: Aggregate Size Distributionmentioning

confidence: 99%

“…Moreover, less labile and nonlabile fractions contribute more than 50% of TOC, indicating more recalcitrant form of carbon in the soil. Ou et al, (2016) reported that the tillage systems obviously affected the distribution of soil aggregates with different sizes. The proportion of the >2 mm aggregate fraction in NT+S was 7.1 % higher than that in NT-S in the 0.00-0.05 m layer.…”

Section: Aggregate Size Distributionmentioning

confidence: 99%

Conservation Tillage and Fertilization Impact on Carbon Sequestration and Mineralization in Soil Aggregates in the North West IGP under an Irrigated Rice-Wheat Rotation: A Review

Yadav¹,

Naresh²,

Kumar³

et al. 2020

Int.J.Curr.Microbiol.App.Sci

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Understanding the process of soil organic carbon (SOC) sequestration and mineralization in aggregates is pertinent to mitigate climate change and minimize risks of soil degradation. The NT system increased the proportion of >2 mm aggregate fraction and reduced the proportion of <0.053 mm aggregates in both 0.00-0.05 and 0.05-0.20 m layers. The SOC concentration, SOC stock and humic and fulvic acids within the >0.25 mm macro-aggregate fraction also significantly increased in the 0.00-0.5 m layer in NT system. However, those within the 2.00-0.25 mm aggregate fraction were significantly reduced in the 0.05-0.200 m layer under NT system. Straw incorporation increased not only the SOC stock in bulk soil, but also the proportion of macro-aggregate, aggregate associated with SOC and humic and fulvic acids concentration within the aggregate. Compared to conventional tillage, the percentages of >2 mm macro-aggregates and water-stable macro-aggregates in rice-wheat double conservation tillage (zero-tillage and straw incorporation) were increased 17.22% and 36.38% in the 0-15 cm soil layer and 28.93% and 66.34% in the 15-30 cm soil layer, respectively. Furthermore, the large macro-aggregates (> 2 mm) with the highest proportion of size distribution represented the major pool of SOC stock (47.3-51.2%) and mineralization amount (38.2-43.6%) in the 0-30 cm layer, followed by that in the small macro-aggregates (0.25-2 mm), regardless of tillage practices. However, the mineralization quotient (mineralization per unit SOC concentration) of macro-aggregates (> 0.25 mm) was lower than that for the other size classes. The NTS enhanced the macro-aggregate formation in the 0-20 cm layer and associated SOC concentration in the 0-10 cm layer. Furthermore, NTS decreased total potential mineralization in the 0-30 cm layer compared with the other tillage practices, attributed to decrease in the large macro-aggregates (30.0-51.4%) with low particulate organic carbon (POC) concentration. Zero tillage and straw incorporation also increased the mean weight diameter and stability of the soil aggregate. In surface soil (0-15 cm), the maximum proportion of total aggregated carbon was retained with 0.25-0.106 mm aggregates, and rice-wheat double-conservation tillage had the greatest ability to hold the organic carbon (33.64 g kg −1 ). In the NPK + FYM treatment, LOC was ∼16% significantly higher in topsoil than the subsurface soil. Aggregate size of > 2000, 250-2000, 53-250 and <53 μm had ∼18, 26, 34 and 18% higher soil aggregate-associated organic C in topsoil than 5-15 cm soil layer, respectively. Decreasing trend of soil aggregate-associated C was observed with decrease in size fraction from > 2000 to < 53 μm. Plots with fertilization of 50% NPK + 50% GM (1.8 t ha −1 ) had significantly higher total soil organic C (TOC), LOC, macro-aggregate-associated C concentrations, and soil aggregation than other treatments. These collected review demonstrated that conservation agriculture that integrates application of nutrient management, tillage and cr...

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Water-Stable Aggregates and Associated Carbon in a Subtropical Rice Soil Under Variable Tillage

Cited by 12 publications

References 34 publications

Cropping diversity with rice influences soil aggregate formation and nutrient storage under different tillage systems

Cropping diversity with rice influences soil aggregate formation and nutrient storage under different tillage systems

Distribution of soil aggregates and organic carbon in deep soil under long-term conservation tillage with residual retention in dryland

Conservation Tillage and Fertilization Impact on Carbon Sequestration and Mineralization in Soil Aggregates in the North West IGP under an Irrigated Rice-Wheat Rotation: A Review

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