Effect of soil macroaggregates crushing on C mineralization in a tropical deciduous forest ecosystem

García‐Oliva, Felipe; Oliva, M; Sveshtarova, Biserka

doi:10.1023/b:plso.0000020978.38282.dc

Cited by 24 publications

(13 citation statements)

References 28 publications

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“…In general, there are two basic size classes of aggregates considered in a soil structure that has 'hierarchical organization' (where smaller structural units are joined to make progressively larger ones): macro-aggregates ( /0.25 mm) and micro-aggregates ( B/ 0.25 mm) (Tisdall & Oades, 1982;Oades, 1984;Elliott, 1986;Gupta & Germida, 1988;Oades & Waters, 1991;Golchin et al, 1995;Six et al, 2002;Mikha & Rice, 2004;García-Oliva et al, 2004;Bayhan et al, 2005). The relative increase or decrease of the number of macro-aggregates in soil can be used to infer the effect of crop rotations and management on structural stability, soil quality and general sustainability of agricultural systems (Carter et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

The effect of crop-pasture rotations on the C, N and S contents of soil aggregates and structural stability in a volcanic soil of south-central Chile

Sandoval

Stolpe

Zagal

et al. 2007

Acta Agriculturae Scandinavica, Section B - Soil & Plant Sc

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The effects of six crop-pasture rotations were evaluated on properties of soil aggregates in a volcanic soil (Humic Haploxerand) of south-central Chile. Rotations that included intensive cropping without pastures, and crops with short-or long-term pastures were maintained for 12 years after which soil samples were taken at 0 Á5 and 5 Á10 cm depths for analysis of the C, N and S contents in the different grades of water-stable aggregates. The mean weight diameter of the aggregates was also determined as an indicator of structural stability. The results showed that the rotations which included long-term pastures of alfalfa (Medicago sativa L.) or white clover (Trifolium repens L.) had higher contents of C, N and S in soil and there was a higher concentration of these elements in macro-aggregates ( /0.5 mm) than in micro-aggregates ( B/0.5 mm). Additionally, the rotations with pastures also produced greater structural stability of the soil aggregates. Consequently, crop rotations that included pastures, particularly those of longer duration, improved the soil and were therefore a more sustainable use of the soil resource compared to the more intensive rotations. Additionally, there was evidence of hierarchical organization of the soil structure, which is a previously non-described feature of volcanic soils.

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Section: Introductionmentioning

confidence: 99%

The effect of crop-pasture rotations on the C, N and S contents of soil aggregates and structural stability in a volcanic soil of south-central Chile

Sandoval

Stolpe

Zagal

et al. 2007

Acta Agriculturae Scandinavica, Section B - Soil & Plant Sc

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“…One way to quantify the proportion of macro-aggregateprotected soil OC is to compare mineralization rates from intact and crushed macro-aggregates. Previous studies found an increase of soil OC mineralization after macro-aggregate crushing (Beare et al, 1994;Bossuyt et al, 2002;Elliott, 1986;Gupta and Germida, 1988;Pulleman and Marinissen, 2004), though not all studies revealed consistent results (Garcia-Oliva et al, 2004;Goebel et al, 2009;Plante et al, 2009;Tian et al, 2015). Moreover, OC mineralization after macro-aggregate crushing differed also with respect to land use.…”

Section: Introductionmentioning

confidence: 89%

Limited protection of macro-aggregate-occluded organic carbon in Siberian steppe soils

et al. 2017

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Abstract. Macro-aggregates especially in agricultural steppe soils are supposed to play a vital role for soil organic carbon (OC) stabilization at a decadal timescale. While most research on soil OC stabilization in steppes focused on North American prairie soils of the Great Plains with information mainly provided by short-term incubation experiments, little is known about the agricultural steppes in southwestern Siberia, though they belong to the greatest conversion areas in the world and occupy an area larger than that in the Great Plains. To quantify the proportion of macro-aggregate-protected OC under different land use as function of land use intensity and time since land use change (LUC) from pasture to arable land in Siberian steppe soils, we determined OC mineralization rates of intact (250–2000 µm) and crushed (< 250 µm) macro-aggregates in long-term incubations over 401 days (20 °C; 60 % water holding capacity) along two agricultural chronosequences in the Siberian Kulunda steppe. Additionally, we incubated bulk soil (< 2000 µm) to determine the effect of LUC and subsequent agricultural use on a fast and a slow soil OC pool (labile vs. more stable OC), as derived from fitting exponential-decay models to incubation data. We hypothesized that (i) macro-aggregate crushing leads to increased OC mineralization due to an increasing microbial accessibility of a previously occluded labile macro-aggregate OC fraction, and (ii) bulk soil OC mineralization rates and the size of the fast OC pool are higher in pasture than in arable soils with decreasing bulk soil OC mineralization rates and size of the fast OC pool as land use intensity and time since LUC increase. Against our hypothesis, OC mineralization rates of crushed macro-aggregates were similar to those of intact macro-aggregates under all land use regimes. Macro-aggregate-protected OC was almost absent and accounted for < 1 % of the total macro-aggregate OC content and to a maximum of 8 ± 4 % of mineralized OC. In accordance to our second hypothesis, highest bulk soil OC mineralization rates and sizes of the fast OC pool were determined under pasture, but mineralization rates and pool sizes were unaffected by land use intensity and time since LUC. However, at one chronosequence mean residence times of the fast and slow OC pool tended to decrease with increasing time since establishment of arable use. We conclude that the tillage-induced breakdown of macro-aggregates has not reduced the OC contents in the soils under study. The decline of OC after LUC is probably attributed to the faster soil OC turnover under arable land as compared to pasture at a reduced plant residue input.

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“…The OM has a key role in the formation and stability of macroaggregates (Tisdall and Oades, 1982), and protects soil against soil erosion (Roldán et al, 1996). Additionally, the contribution of MO is a primary source of microbial biomass C and soil fungus (García-Oliva et al, 2004), important agents in the formation of the structure (Curaqueo et al, 2010).…”

Section: Aggregate Distribution and Macroaggregates Stabilitymentioning

confidence: 99%

Effect of sewage sludge and sawdust in association with hybrid ryegrass (Lolium x hybrydum Hausskin.) on soil macroaggregates and water content

E¹,

Celis²,

P³

2012

Chilean J. Agric. Res.

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Chilean soils degradation is a serious problem affecting directly the productivity of most of the crops. Some evidence indicates sewage sludge can improve soil physical properties, especially when combined with sawdust. The objective of this work was to evaluate the effect of different mixtures of sewage sludge (LU) and sawdust (RA) on water-stable aggregates and available water content of a degraded Alfisol cropped with hybrid ryegrass (Lolium × hybridum Hausskn.), under greenhouse conditions. The experimental design was a completely randomized with a factorial arrangement of 2 × 9 (ryegrass × rates of sludge and sawdust). Treatments were 25 and 50 Mg LU ha -1 mixed with 10, 25, and 50 Mg RA ha -1 . Ratio mixtures of LU/RA were set in pots with hybrid ryegrass. Soil available water content (AW), percentage of macroaggregates (MA) and water-stable aggregates (AWD) were evaluated. Ryegrass aboveground biomass was also measured. Mixtures of LU/RA amended to the soil increased MA and AWD, an effect that was most evident at 50 Mg ha -1 . The AW value was greater when LU was amended to 50 Mg ha -1 mixed with RA at doses of 10, 25, and 50 Mg ha -1. There was greater aboveground biomass of hybrid ryegrass, directly related to increasing doses of LU and RA in the mixtures. The addition to soil of both organic residues combined, LU and RA, improved the physical parameters studied, especially in the presence of hybrid ryegrass.

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Effect of soil macroaggregates crushing on C mineralization in a tropical deciduous forest ecosystem

Cited by 24 publications

References 28 publications

The effect of crop-pasture rotations on the C, N and S contents of soil aggregates and structural stability in a volcanic soil of south-central Chile

The effect of crop-pasture rotations on the C, N and S contents of soil aggregates and structural stability in a volcanic soil of south-central Chile

Limited protection of macro-aggregate-occluded organic carbon in Siberian steppe soils

Effect of sewage sludge and sawdust in association with hybrid ryegrass (Lolium x hybrydum Hausskin.) on soil macroaggregates and water content

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