Role of cationic polarization in humus-increased soil aggregate stability

2016 ◽  
Vol 67 (3) ◽  
pp. 341-350 ◽  
Author(s):  
X. R. Huang ◽  
H. Li ◽  
S. Li ◽  
H. L. Xiong ◽  
X. J. Jiang
Keyword(s):  
Aggregate Stability ◽  
Soil Aggregate ◽  
Soil Aggregate Stability

The role of Ca-organic interactions in soil aggregate stability .III. Mechanisms and models

Soil Research ◽  
1989 ◽  
Vol 27 (2) ◽  
pp. 411 ◽  
Author(s):  
M Muneer ◽  
JM Oades
Keyword(s):  
Organic Matter ◽  
Organic Materials ◽  
Surface Soil ◽  
Aggregate Stability ◽  
Soil Aggregate ◽  
Soil Aggregate Stability ◽  
Colloidal Aggregates ◽  
Clay Aggregates ◽  
Binding Mechanisms

Serial additions of glucose after drying-wetting cycles led to substantial aggregation of the surface soil from a red-brown earth. Addition of glucose and Ca compounds resulted in up to 80% of the soil bound in particles >2000�m with only a small portion of the soil in particles 4 0 �m. Treatment of the soils with Na4P2O7 caused dispersion of most of the clay but did not disrupt larger aggregates. More disaggregation was caused by treatments with HCI (0.02 M and 0.1 M), indicating the presence of pyrophosphate-resistant binding mechanisms which were presumed to be due to Ca bridging. Addition of Ca to the soil reduced the efficiency of extraction of organic materials by NaOH. This effect was eliminated by a pretreatment with 1 M HCl, indicating a 'bridging' effect of Ca between polycarboxylic macromolecules (humic acids) and clays. The role of Ca in clay and organic matter flocculation, the bridging of clay aggregates to organic materials and interactions of these colloidal aggregates with the biologic cycle is illustrated in some pictorial models.

The role of Ca-organic interactions in soil aggregate stability .II. Field studies with 14C-labeled straw, CaCO3 and CaSO4.2.H2O

Soil Research ◽  
1989 ◽  
Vol 27 (2) ◽  
pp. 401 ◽  
Author(s):  
M Muneer ◽  
JM Oades
Keyword(s):  
Wheat Straw ◽  
Sandy Loam ◽  
Aggregate Stability ◽  
Field Studies ◽  
Soil Aggregate ◽  
Soil Aggregate Stability ◽  
Fine Sandy Loam ◽  
The Stability ◽  
Dispersible Clay

Uniformly 14C-labelled straw with or without CaCO3 or CaSO4.2H2O was incubated in a leached, fine sandy loam in the field. The addition of both Ca salts increased the residual 14C in the soil after several months decomposition, CaSO4.2H2O being more effective than CaCO3 in this respect. Addition of the Ca salts decreased the amount of dispersible clay and increased the proportion of particles 50-250 �m diameter. The addition of 14C-labelled wheat straw (with or without CaSO4.2H2O or CaCO3) increased the stability of aggregates >2000 pm diameter. Addition of Ca during decomposition of straw resulted in a synergistic stabilization of aggregates >1 mm. Moreover, the stabilization was prolonged in the presence of Ca.

The role of Ca-organic interactions in soil aggregate stability .I. Laboratory studies with glucose 14C, CaCO3 and CaSO4.2.H2O

Soil Research ◽  
1989 ◽  
Vol 27 (2) ◽  
pp. 389 ◽  
Author(s):  
M Muneer ◽  
JM Oades
Keyword(s):  
Sandy Loam ◽  
Aggregate Stability ◽  
Soil Aggregate ◽  
Control Soil ◽  
Laboratory Studies ◽  
Soil Aggregate Stability ◽  
Fine Sandy Loam ◽  
Water Stable Aggregates ◽  
Dispersible Clay

14C-glucose with or without CaCO3 or CaS04.2H2O was incubated in a leached fine sandy loam under controlled temperature and humidity for 120 days. The addition of CaSO4.2H2O decreased the release of 14CO2, compared with soil with 14C-glucose and CaCO3 and 14C-glucose only. Addition of CaCO3 initially stimulated release of 14CO2 but subsequently the release of 14CO2 was inhibited compared with treatments with no calcium additions. Addition of both CaSO4.2H20 and CaCO3 resulted in more residual 14C in the soil at the end of the incubation period than in the control soil to which no calcium was added. The addition of CaSO4.2H2O and CaCO3 led to increases in water-stable aggregates 50-250 �m diameter, and decreased the amount of dispersible clay. In the presence of calcium and glucose, the stabilization of aggregates >1000�m occurred and they persisted for a longer time than when no additions of calcium were made.

Dynamics of soil aggregate stability as induced by potassium in a soil-plant system

2021 ◽  
pp. 1-9
Author(s):  
Surachet Aramrak ◽  
Natthapol Chittamart ◽  
Worachart Wisawapipat ◽  
Wutthida Rattanapichai ◽  
Mutchima Phun-Iam ◽  
...  
Keyword(s):  
Aggregate Stability ◽  
Soil Aggregate ◽  
Soil Aggregate Stability ◽  
Plant System

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 Sludge amendment accelerating reclamation process of reconstructed mining substrates

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Dan Li ◽  
Ningning Yin ◽  
Ruiwei Xu ◽  
Liping Wang ◽  
Zhen Zhang ◽  
...  
Keyword(s):  
Soil Structure ◽  
Aggregate Stability ◽  
Soil Aggregate ◽  
Soil Reclamation ◽  
Soil Restoration ◽  
Total Biomass ◽  
Soil Aggregate Stability ◽  
Mining Soil ◽  
Positive Correlations ◽  
Reclamation Process

AbstractWe constructed a mining soil restoration system combining plant, complex substrate and microbe. Sludge was added to reconstructed mine substrates (RMS) to accelerate the reclamation process. The effect of sludge on plant growth, microbial activity, soil aggregate stability, and aggregation-associated soil characteristics was monitored during 10 years of reclamation. Results show that the height and total biomass of ryegrass increases with reclamation time. Sludge amendment increases the aggregate binding agent content and soil aggregate stability. Soil organic carbon (SOC) and light-fraction SOC (LFOC) in the RMS increase by 151% and 247% compared with those of the control, respectively. A similar trend was observed for the glomalin-related soil protein (GRSP). Stable soil aggregate indexes increase until the seventh year. In short, the variables of RMS determined after 3–7 years insignificantly differ from those of the untreated sample in the tenth-year. Furthermore, significant positive correlations between the GRSP and SOC and GRSP and soil structure-related variables were observed in RMS. Biological stimulation of the SOC and GRSP accelerates the recovery of the soil structure and ecosystem function. Consequently, the plant–complex substrate–microbe ecological restoration system can be used as an effective tool in early mining soil reclamation.

scholarly journals Short-Term Dynamics of Soil Aggregate Stability in the Field

2014 ◽  
Vol 78 (4) ◽  
pp. 1168-1176 ◽  
Author(s):  
Baptiste Algayer ◽  
Yves Le Bissonnais ◽  
Frédéric Darboux
Keyword(s):  
Aggregate Stability ◽  
Soil Aggregate ◽  
Short Term ◽  
Soil Aggregate Stability
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