Soil Structural Stability during Rapid Wetting: Influence of Land Use on Some Aggregate Properties

Caron, Jean; Espíndola, Carlos Roberto; Angers, Denis A.

doi:10.2136/sssaj1996.03615995006000030032x

Cited by 71 publications

(34 citation statements)

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“…The soil of the SDle treatment had passed through tillage only a year before the collection and testing of the soil samples, so that the SDle aggregates were the least age-hardened (Utomo and Dexter, 1981). Thus, the rapid entrance of water into the soil pores during the testing of the dry aggregates in the rain simulator may have led to their rupture (Caron et al, 1996), thereby compromising the soil structural stability. Cerrado).…”

Section: Resultsmentioning

confidence: 99%

Recovery of an Oxisol Degraded by the Construction of a Hydroelectric Power Plant

Carvalho

Espíndola

Alves

et al. 2015

Rev. Bras. Ciênc. Solo

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the removal of thick layers of soil under native scrubland (Cerrado) on the right bank of the Paraná River in selvíria (state of Mato grosso do sul, brazil) for construction of the ilha solteira hydroelectric Power Plant caused environmental damage, affecting the revegetation process of the stripped soil. over the years, various kinds of land use and management systems have been tried, and the aim of this study was to assess the effects of these attempts to restore the structural quality of the soil. The experiment was conducted considering five treatments and thirty replications. the following treatments were applied: stripped soil without anthropic intervention and total absence of plant cover; stripped soil treated with sewage sludge and planted to eucalyptus and grass a year ago; stripped soil developing natural secondary vegetation (capoeira) since 1969; pastureland since 1978, replacing the native vegetation; and soil under native vegetation (Cerrado). in the 0.00-0.20 m layer, the soil was chemically characterized for each experimental treatment. a 30-point sampling grid was used to assess soil porosity and bulk density, and to assess aggregate stability in terms of mean weight diameter (MwD) and geometric mean diameter (gMD). aggregate stability was also determined using simulated rainfall. the results show that using sewage sludge incorporated with a rotary hoe improved the chemical fertility of the soil and produced more uniform soil pore size distribution. leaving the land to develop secondary vegetation or turning it

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Section: Resultsmentioning

confidence: 99%

Recovery of an Oxisol Degraded by the Construction of a Hydroelectric Power Plant

Carvalho

Espíndola

Alves

et al. 2015

Rev. Bras. Ciênc. Solo

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“…Bulk density data showed the expected difference between management regimes, due to the high degree of stability and settlement of the non-tilled soil. In NT soil, colloidal organic particles could support the occlusion of pores (Caron et al, 1996), decreasing the coarse porosity and increasing the very fine porosity (Table 2). Moreover, the CT site on the MPC soil had been recently ploughed, although it was impossible to detect wheel tracks.…”

Section: General Characteristics Of Soilsmentioning

confidence: 99%

Shear strength of aggregates compared with bulk soil of two haploxerolls from Chile

Fuentes

Seguel

Casanova

2013

J. Soil Sci. Plant Nutr.

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Shear strength of aggregates and the bulk soil matrix in two Haploxeroll of central Chile was assessed in order to determine: (1) the effect of previous tillage on shear parameters between aggregates and in the soil matrix and (2) the effects of structure development on differences between dry-wet mechanical parameters. Undisturbed soil cylinders and single aggregates (0-10 cm layer) were collected from untilled and conventionally tilled sites in the Santiago (STG) and Mapocho Soil Series (MPC). General soil properties and shear parameters were determined. The shear tests were conducted on confined and free-draining aggregates and on soil cores, equilibrated at field capacity and air-dried, to obtain data on cohesion and angle of internal friction in the samples. Dry aggregates from the tilled sites showed 40 and 70% greater cohesion compared to untilled sites in STG and MPC soils, respectively, associated with a decrease in coarse porosity in the STG soil and a decrease in organic matter in the MPC soil, thus reducing its friability. In air-dried condition, aggregates from untilled sites developed 6-7 fold strength compared with soil matrix and the difference increased (9-13 fold) in samples from tilled sites. Undisturbed soil cores showed higher friction values when air-dried (68º in average, compared with 43º in individual aggregates), but at -33kPa water tension the tendency was reversed. The results of this study confirm that smaller differences between wet and dry behaviour are associated with better structural development and lower tillage intensity.

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“…Pore character of soil aggregates is the main factor influencing wetting speed, such as pore size and camber. Caron reported that pore camber indexes in NT is three times more compared to in CT, water immerse rate decreased by 70% and increased aggregates stability (Mazurak et al, 1950;Caron et al, 1996). It is suitable to form soil structure for soil pore type and quantity and soil density which was lower in NTR-r and NTRw-r compared to PUR-r that was caused by stable heat capability, relative stable electrical field, continuous immersing and strong water retention ability of labile organic matters which were rotted from root straw internal or external soil pore (Xie et al, 2002;Wei et al, 2006).…”

Section: Organic Carbon In Aggregatesmentioning

confidence: 99%

Mechanisms of Soil Aggregates Stability in Purple Paddy Soil under Conservation Tillage of Sichuan Basin, China

Tang

Luo

et al. 2012

Computer and Computing Technologies in Agriculture V

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Abstract. Ridge culture is a special conservation tillage method, but the longterm influence of this tillage system on soil aggregate-size stability in paddy fields is largely unknown in southwest of china. The objectives of this paper are to evaluate soil aggregates stability and to determine the relationship between SOC and soil aggregate stability. Soil samples at 0-20 cm layer were adopted from a long-term (16 yr) field experiment including conventional tillage: plain culture, summer rice crop and winter upland crop under drained conditions (PUR-r), and conservation tillage: ridge culture without tillage, summer rice and winter fallow with floodwater layer annually (NTR-f), and winter upland crop under drained conditions (NTR-r), and wide ridge culture without tillage, summer rice crop and winter upland crop under conditions (NTRw-r), respectively. The determination of aggregate-size stability distribution involves the assumptions that soil aggregates can be categorized in terms of their size and water stability (slaking resistance). Experimentally this procedure involves the slaked and capillary-wetted pretreatments; and a subsequent slaking treatment of aggregates >0.250 mm in size. WSMA and NMWD were applied to simulate the breakdown mechanisms of aggregates for studying soil stability based on aggregate resistance to slaking in paddy soil. The results showed that the amount of aggregates-size was greatly observed in the fraction of 2~6.72 mm under ridge culture in paddy soil (more than 50%) under slaking and capillary-wetting pretreatment. The proportion of soil macro-aggregates (＞0.25 mm) in conservation tillage was greatly higher than that in conventional tillage under subsequent slaking treatment. Minimal differences of aggregate stability between slaking and wetting were observed, while significant differences were found between ridge culture and plain culture. The aggregates stability under slaking treatment ranked in the order of NTR-r＞NTRw-r＞NTR-f＞PUR-r, while under wetting was NTRw-r ＞ NTR-r ＞ NTR-f ＞ PUR-r, respectively. There was a positive correlation between the aggregates stability and SOC concentrations under wetting, and low correlation was observed under slaking pretreatment. Soil exposure with tillage and lack of rice/rape-seed stubble inputs caused declines in aggregation and organic carbon, both of which make soil susceptible to water erosion. Adoption of ridge culture with no-tillage

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Soil Structural Stability during Rapid Wetting: Influence of Land Use on Some Aggregate Properties

Cited by 71 publications

References 0 publications

Recovery of an Oxisol Degraded by the Construction of a Hydroelectric Power Plant

Recovery of an Oxisol Degraded by the Construction of a Hydroelectric Power Plant

Shear strength of aggregates compared with bulk soil of two haploxerolls from Chile

Mechanisms of Soil Aggregates Stability in Purple Paddy Soil under Conservation Tillage of Sichuan Basin, China

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