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

Cao, Sheng Xian; Zhou, Yuzhou; Zhou, Yaoyu; Zhou, Xuan; Zhou, Weijun

doi:10.1016/j.jenvman.2021.112847

Cited by 66 publications

(39 citation statements)

References 39 publications

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“…The mean weight diameter (MWD) was calculated to indicate the stability of soil aggregates as follows in Equation 1:

\begin{equation}{\rm{MWD}} = \sum\nolimits_{i = 1}^n {{x_i}{w_i}} \end{equation}

Where x i is the average diameter of two adjacent particle diameters, w i is the weight of a certain size aggregate. Higher MWD values indicate more stable soil aggregates (Algayer et al., 2014; Cao et al., 2021). Soil pH was measured using a soil pH meter (PHS‐3C).…”

Section: Methodsmentioning

confidence: 99%

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Biological conservation measures are better than engineering conservation measures in improving soil quality of eroded orchards in southern China

Qin

Zhang

et al. 2022

Soil Science Soc of Amer J

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Both biological and engineering measures have proven to be effective soil and water conservation practices for eroded environments, whereas how the soil quality varies with them remains unclear. In this study, we measured soil properties in the 0-to-100-cm soil layer of eroded orchards in southern China after 17-yr of application of different conservation measures. The purpose of the experiment was to examine the effect of biological (grass planting, intercropping) and engineering measures (terrace) on the soil quality of eroded orchards. We selected an orchard plot with traditional clean-tillage as control. In comparison, soil pH, organic carbon, total phosphorus, microbial carbon, available potassium, and available microelements contents increased significantly in orchards with biological measures, and the improvements were more dramatic in orchards planting grass in strips. However, biological measures significantly reduced the mean weight diameter of aggregates. Engineering measures significantly increased the soil pH of orchards but decreased the contents of available iron and available manganese. The soil quality index (SQI)

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“…The mean weight diameter (MWD) was calculated to indicate the stability of soil aggregates as follows in Equation 1:

\begin{equation}{\rm{MWD}} = \sum\nolimits_{i = 1}^n {{x_i}{w_i}} \end{equation}

Section: Methodsmentioning

confidence: 99%

“…Where x i is the average diameter of two adjacent particle diameters, w i is the weight of a certain size aggregate. Higher MWD values indicate more stable soil aggregates (Algayer et al, 2014;Cao et al, 2021). Soil pH was measured using a soil pH meter (PHS-3C).…”

Section: Soil Sampling and Laboratory Analysismentioning

confidence: 99%

Biological conservation measures are better than engineering conservation measures in improving soil quality of eroded orchards in southern China

Qin

Zhang

et al. 2022

Soil Science Soc of Amer J

View full text Add to dashboard Cite

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“…Indeed, aggregate formation and breakdown and the SOC distribution in the different soil aggregate fractions play a key role in understanding C sequestration and stabilization processes [35,36]. Moreover, the diverse aggregates composition of different sizes class is influenced by human impacts, among which land use modification and management plays a vital role in altering the soil aggregates composition [37].…”

Section: Introductionmentioning

confidence: 99%

Crop Diversification Effects on Soil Aggregation and Aggregate-Associated Carbon and Nitrogen in Short-Term Rainfed Olive Groves under Semiarid Mediterranean Conditions

et al. 2022

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Soil particle aggregation and their associated carbon (C) and nitrogen (N) content can provide valuable diagnostic indicators of changes in soil properties in response to the implementation of different agricultural management practices. In this sense, there is limited knowledge regarding the impact of intercropping on soil organic carbon (SOC) and total nitrogen (TN) pools in aggregates. This study aimed to evaluate the short-term effect (4 years) of three crop diversifications in rainfed olive orchards on soil aggregation, SOC and TN concentration and SOC stocks (SOC-S) under semi-arid Mediterranean conditions. Olive orchards were diversified with Crocus sativus (D-S), Vicia sativa and Avena sativa in rotation (D-O) and Lavandula x intermedia (D-L) and compared with monocropping system (CT). Soil samples were collected at two depths (0–10 and 10–30 cm) and analysed for soil aggregate mass, SOC and TN content in aggregate-size fractions obtained by the wet-sieving method. Changes caused by crop diversifications on SOC-S were also determined. Overall, after 4 years, a reduction in aggregation values was observed. However, D-S increased the macroaggregates (>250 μm) percentage, Mean Weigh Diameter values, and Geometric Mean Value in the 0–10 cm. Across treatments, aggregate-associated C in 0–10 cm was higher in the D-S treatment, while in the 10–30 cm soil layer, the greatest values were found in CT. Regarding the SOC-S, after 4 years, significant losses were recorded under CT management in 0–10 cm (−1.21 Mg ha−1) and 10–30 cm (−0.84 Mg ha−1), while D-O and D-L showed similar values to those obtained at the beginning of the study. The highest increases in SOC-S were found in D-S, with an increase of 5.88% in the 0–10 cm and 14.47% in the 10–30 cm. Our results showed the high potential of the diversified cropping system to increase soil stability and SOC sequestration.

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“…Soil aggregates are heterogeneous combinations of organic matter and mineral particles, which are generally regarded as the nucleus of SOC stocks processes (Zhong et al, 2019). Soil aggregates are spatially heterogeneous, which leads to significant differences in the distribution and sequestration of SOC among the aggregates (Cao et al, 2021; Liu et al, 2020). For example, most SOC is occluded by macro‐aggregates, so its SOC content is frequently higher than that of other aggregates (Zhong et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

The formation of small macro‐aggregates induces soil organic carbon stocks in the restoration process used on cut slopes in alpine regions of China

et al. 2022

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Road construction in mountainous areas of China has formed bare slopes on a large scale, which has aggravated soil erosion and carbon loss, and the restoration processes have changed soil structure and fertility. However, there are few reports regarding the differences of soil aggregate dynamics and SOC sequestration under different restoration process for cut slopes. In this study, three types of cut slopes [cut slope restored naturally (CSN); cut slope restored with three‐dimensional mesh (CST); cut slope restored with galvanized wire mesh (CSG)] and natural slope (NS) in alpine regions were selected as the research objects. SOC stocks and their key driving factors were then analyzed. The results showed that CSG was more beneficial to the formation of macro‐aggregates than CSN and CST. There were significant differences in wet‐sieved aggregate stability under different restoration process, where the sort by strength of stability was NS > CSG > CST > CSN. Aggregate size was a more important factor for SOC stocks than restoration process. The increase of SOC stocks was mainly due to that within small macro‐aggregates. RandomForest analysis revealed that the mass proportion of micro‐aggregates was the most important factor affected SOC stocks, while SOC stocks within large macro‐aggregates and small macro‐aggregates and porosity significantly affected SOC stocks. Partial least squares path modelling analysis found the particle size and stability of aggregates had negative total effects on SOC stocks, and SOC content had positive total effect on that. Overall, for the ecological restoration of cut slope in alpine regions, CSG was most beneficial to increase soil aggregate stability and SOC stocks.

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

Cited by 66 publications

References 39 publications

Biological conservation measures are better than engineering conservation measures in improving soil quality of eroded orchards in southern China

Biological conservation measures are better than engineering conservation measures in improving soil quality of eroded orchards in southern China

Crop Diversification Effects on Soil Aggregation and Aggregate-Associated Carbon and Nitrogen in Short-Term Rainfed Olive Groves under Semiarid Mediterranean Conditions

The formation of small macro‐aggregates induces soil organic carbon stocks in the restoration process used on cut slopes in alpine regions of China

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