Fine root mineralization, soil organic matter and exchangeable cation dynamics in slash and burn agriculture in the semi-arid northeast of Brazil

Lessa, Armando; Anderson, Daniel W.; Moir, J. O.

doi:10.1016/0167-8809(96)01044-4

Cited by 22 publications

(14 citation statements)

References 23 publications

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“…Likewisely, balanced mineral fertilization in the mono-cropping system obtain only half the amount of carbon input of that in the double cropping system, hence results in a decreasing trend in SOC in the arid and semi-arid areas. A similar decreasing trend in SOC was also observed in the semi-arid Brazil (Lessa et al, 1996). Manure applications sustain a significantly increasing trend in SOC, not only in the humid and semi-humid warm temperate areas with the double cropping system, but also in arid and semi-arid areas with the mono-cropping systems, which is widely documented all over the world (Cuvardic et al, 2004;Mando et al, 2005;Galantini and Rosell, 2006;Shen et al, 2007).…”

Section: Effect Of Long-term Fertilization On Socsupporting

confidence: 50%

Soil organic carbon dynamics under long-term fertilizations in arable land of northern China

et al. 2010

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Abstract. Soil carbon sequestration is a complex process influenced by agricultural practices, climate and soil conditions. This paper reports a study of long-term fertilization impacts on soil organic carbon (SOC) dynamic from six long-term experiments. The experiment sites are located from warm-temperate zone with a double-cropping system of corn (Zea mays L.) -wheat (Triticum Aestivium L.) rotation, to mild-temperate zones with mono-cropping systems of continuous corn, or a three-year rotation of corn-wheatwheat. Mineral fertilizer applications result in an increasing trend in SOC except in the arid and semi-arid areas with the mono-cropping systems. Additional manure application is important to maintain SOC level in the arid and semi-arid areas. Carbon conversion rate is significant lower in the warmtemperate zone with double cropping system (6.8%-7.7%) than that in the mild-temperate areas with mono-cropping systems (15.8%-31.0%). The conversion rate is significantly correlated with annual precipitation and active accumulative temperature, i.e., higher conversion rate under lower precipitation and/or temperature conditions. Moreover, soil high in clay content has higher conversion rate than soils low in clay content. Soil carbon sequestration rate ranges from 0.07 to 1.461 t ha −1 year −1 in the upland of northern China. There is significantly linear correlation between soil carbon sequestration and carbon input at most sites, indicating that these soils are not carbon-saturated thus have potential to migrate more CO 2 from atmosphere.

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Section: Effect Of Long-term Fertilization On Socsupporting

confidence: 50%

Soil organic carbon dynamics under long-term fertilizations in arable land of northern China

et al. 2010

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“…test (Table 2). Several authors observed that soil pH increased from 0.3 to 3.0 units of pH after burning and that this increase could be due to K + and Na + oxides, hydroxides, and carbonates from wood ash or soil OM (Ballcoelho et al, 1993;Ulery et al, 1993;Lessa et al, 1996;Lynham et al, 1998;Mills and Fey, 2004). Bentonite and montmorillonite pH increased 0.3-1.4 units of pH after heating at 650°C as shown by S.N.K.…”

Section: Resultsmentioning

confidence: 88%

“…test) (Table 3). Lessa et al (1996) and Ketterings and Bigham (2000) observed a decrease in Al 3+ , while Andrade et al (2002) observed an increase in exchangeable Al 3+ in soils after heating at temperatures over 300°C. As pointed out by Lessa et al (1996), the increase in Al 3+ could result in poor conditions for the cassava crop (family of euforbiáceas-manihot utilíssima), which it is widely grown in Paraná state.…”

Section: Resultsmentioning

confidence: 88%

“…Ketterings and Bigham (2000) observed that most carbon is depleted at soil surface temperatures over 600°C. A significant decrease in soil OM due to burning was also observed in different field experiments (Lessa et al, 1996;Bird et al, 2000;Ketterings and Bigham, 2000;Mills and Fey, 2004). Soil and clay pH was measured in distilled water and 1.0 mol L − 1 KCl ( Table 2).…”

Section: Resultsmentioning

confidence: 96%

“…plantation. Experiments have shown that depending on burning temperature several changes can occur in soils such as almost complete depletion of OM; increase in pH and pH pzc , mainly because of the destruction of OM and input of exchangeable cations (Na + , K + ); changes in exchangeable cations (Al 3+ , Ca 2+ , Mg 2+ , Na + , K + ); and decrease in cation exchange capacity (CEC) due to OM depletion (Ballcoelho et al, 1993;Lessa et al, 1996;Bird et al, 2000;Ketterings and Bigham, 2000;Alleoni et al, 2003;Mills and Fey, 2004). Therefore, in the short term burn farming can stimulate productivity, but in the long term productivity is reduced because of lost soil, low nutrient concentrations, and increased soil crusting (Yang et al, 2003;Mills and Fey, 2004).…”

Section: Introductionmentioning

confidence: 99%

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Effect in glyphosate adsorption on clays and soils heated and characterization by FT–IR spectroscopy

et al. 2006

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Ash Physical Characteristics Affects Differently Soil Hydrology and Erosion Subprocesses

Thomaz

2017

Land Degrad Dev

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After slash‐and‐burn agriculture, topsoil becomes covered by ash layers of various colors. The different colored ashes have particular properties that may affect the hydro‐erosional processes on hillslopes in different ways. In the present study, the effects of black and gray ashes on the hydro‐erosional processes were examined in the context of slash‐and‐burn, and the soil erosion subprocesses responsible for soil loss were identified. Black and gray ashes were collected in the field after two slash‐and‐burn fires. The experiment was conducted in wettable, clay‐textured, brown oxisols. In the laboratory, the ash was spread carefully by hand over a plot of 0·14 m2. Simulated rainfall was discharged from a height of 6 m from the central plot for a period of 30 min with a rainfall intensity of 58 mm h−1. Gray ash reduced infiltration five times more than black ash and four times more than bare soil. The runoff coefficient showed black ash with minor runoff of ~7%, bare soil displayed intermediate runoff of ~12%, and gray ash exhibited the major runoff coefficient of 19%. Gray ash generated six and three and a half times more sediment than black ash and bare soil, respectively. This study determined that soil hydrology is affected more by ash cover than soil loss. Black ash protects against soil erosion and improves soil water infiltration; gray ash dramatically changes the topsoil hydrology and interill erosion processes; and bare soil and soil cover with different ash colors lose soil through different erosion subprocesses. Copyright © 2017 John Wiley & Sons, Ltd.

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Fine root mineralization, soil organic matter and exchangeable cation dynamics in slash and burn agriculture in the semi-arid northeast of Brazil

Cited by 22 publications

References 23 publications

Soil organic carbon dynamics under long-term fertilizations in arable land of northern China

Soil organic carbon dynamics under long-term fertilizations in arable land of northern China

Effect in glyphosate adsorption on clays and soils heated and characterization by FT–IR spectroscopy

Ash Physical Characteristics Affects Differently Soil Hydrology and Erosion Subprocesses

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