Effects of conservation and conventional tillage systems after land clearing on soil properties and crop yield in Santa Cruz, Bolivia

Barber, R. G.; Orellana, Mabel; Reyes, Francisco Bruno Navarro; Díaz, Oscar; Soruco, M.A.

doi:10.1016/0167-1987(96)01012-4

Cited by 22 publications

(21 citation statements)

References 22 publications

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“…9). This more pronounced aggregation increase does, however, not seem to lead to an [3,26,[30][31][32]35,38,59,65,77,79,109,111,113,114,139,164,172,173,177,194,Paustian and Elliott,unpublished,214,219,220,241] for (sub)tropical soils and from [2,11,22,42,50,[54][55][56]58,67,72,78,84,85,89,93,95,96,104,105,133,134,136,146,…”

Section: Mechanisms Of C Sequestration Under No-tillagementioning

confidence: 99%

Soil organic matter, biota and aggregation in temperate and tropical soils - Effects of no-tillage

Feller²,

et al. 2002

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-The long-term stabilization of soil organic matter (SOM) in tropical and temperate regions is mediated by soil biota (e.g. fungi, bacteria, roots and earthworms), soil structure (e.g. aggregation) and their interactions. On average, soil C turnover was twice as fast in tropical compared with temperate regions, but no major differences were observed in SOM quality between the two regions. Probably due to the soil mineralogy dominated by 1:1 clay minerals and oxides in tropical regions, we found a higher aggregate stability, but a lower correlation between C contents and aggregate stability in tropical soils. In addition, a smaller amount of C associated with clay and silt particles was observed in tropical versus temperate soils. In both tropical and temperate soils, a general increase in C levels (≈ 325 ± 113 kg C·ha -1 ·yr -1 ) was observed under no-tillage compared with conventional tillage. On average, in temperate soils under no-tillage, compared with conventional tillage, CH 4 uptake (≈ 0.42 ± 0.10 kg C-CH 4 ·ha -1 ·yr -1 ) increased and N 2 O emissions increased (≈ 1.95 ± 0.45 kg N-N 2 O·ha -1 ·yr -1 ). These increased N 2 O emissions lead to a negative global warming potential when expressed on a CO 2 equivalent basis. La stabilisation à long terme de la matière organique du sol (MOS) dans les régions tempérées et intertropicales est sous la dépendance de l'activité biologique (champignons, bactéries, macrofaune et racines), de la structure du sol (agrégation) et de leurs interactions. En moyenne, si le turnover du carbone du sol (C) est environ deux fois plus rapide en régions intertropicales qu'en régions tempérées, peu de différences apparaissent toutefois quant à la qualité de la MOS sous ces climats différents. La stabilité de l'agrégation est plus élevée pour les sols des régions intertropicales, ceci étant probablement dû à leur minéralogie dominée par des argiles de type 1:1 associés à des oxihydroxides métalliques. Toutefois, pour les sols tropicaux, la corrélation entre teneur en C et stabilité de l'agrégation est plus faible et de moindres quantités de C sont associées avec les éléments fins (argile+limon). Aussi bien sous climats tempéré que tropical et subtropical, une augmentation générale des stocks de C du sol (≈ 325 ± 113 kg C·ha -1 ·an -1 ) est observée avec les pratiques de non labour. Pour les sols des régions tempérées, si une fixation de CH 4 (≈ 0.42 ± 0.10 kg C-CH 4 ·ha -1 ·an -1 ) est mesurée sous non-labour, parallèlement une émission de N 2 O est observée (≈ 1.95 ± 0.45 kg N-N 2 O·ha -1 ·an -1 ), conduisant finalement à un bilan négatif en terme de réchauffement global exprimé en équivalents de flux de C-CO 2 .carbone du sol / agrégation / émissions N 2 O / non-labour / régions tempérées et intertropicales INTRODUCTIONThe conservation of sufficient soil organic matter (SOM) levels is crucial for the biological, chemical and physical soil functioning in both temperate and tropical ecosystems. Appropriate levels of SOM ensure soil fertility and minimize agricultural impac...

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Section: Mechanisms Of C Sequestration Under No-tillagementioning

confidence: 99%

Soil organic matter, biota and aggregation in temperate and tropical soils - Effects of no-tillage

Feller²,

et al. 2002

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“…In contrast, less intensive practices, particularly no-till, reduce soil erosion through the development of a litter layer (Karlen et al 1994), and also enhance aggregate stability in the soil that slows decomposition of organic matter by providing protection within soil aggregates (Elliott 1986;Jastrow 1996;Six et al 1998Six et al , 2000. Consequently, reducing tillage intensity typically increases storage of SOC relative to conventional till practices (e.g., Mielke et al 1986;Lal et al 1994;Franzluebbers et al 1995;Larney et al 1997;Salinas-Garcia et al 1997;Doran et al 1998;Barber et al 1996;Sa et al 2001;Bayer et al 2002).…”

Section: Introductionmentioning

confidence: 99%

Agricultural management impacts on soil organic carbon storage under moist and dry climatic conditions of temperate and tropical regions

2005

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We conducted a meta-analysis to quantify the impact of changing agricultural land use and management on soil organic carbon (SOC) storage under moist and dry climatic conditions of temperate and tropical regions. We derived estimates of management impacts for a carbon accounting approach developed by the Intergovernmental Panel on Climate Change, addressing the impact of long-term cultivation, setting-aside land from crop production, changing tillage management, and modifying C input to the soil by varying cropping practices. We found 126 articles that met our criteria and analyzed the data in linear mixed-effect models. In general, management impacts were sensitive to climate in the following order from largest to smallest changes in SOC: tropical moist>tropical dry>temperate moist>temperate dry. For example, long-term cultivation caused the greatest loss of SOC in tropical moist climates, with cultivated soils having 0.58 AE 0.12, or 58% of the amount found under native vegetation, followed by tropical dry climates with 0.69 AE 0.13, temperate moist with 0.71 AE 0.04, and temperate dry with 0.82 AE 0.04. Similarly, converting from conventional tillage to no-till increased SOC storage over 20 years by a factor of 1.23 AE 0.05 in tropical moist climates, which is a 23% increase in SOC, while the corresponding change in tropical dry climates was 1.17 AE 0.05, temperate moist was 1.16 AE 0.02, and temperate dry was 1.10 AE 0.03. These results demonstrate that agricultural management impacts on SOC storage will vary depending on climatic conditions that influence the plant and soil processes driving soil organic matter dynamics.

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“…Na agricultura mecanizada, máquinas e implementos exercem pressões, podendo causar um rearranjo dos componentes sólidos do solo, desestruturando-o e o compactando, diminuindo, assim, sua porosidade. Deste modo e com o tempo, verifica-se maior densidade do solo sob manejo agrícola em relação ao encontrado em condições naturais (Anjos et al, 1994;Barber et al, 1996).…”

Section: Introductionunclassified

Atributos físicos de solos sob diferentes usos com irrigação no semiárido de Pernambuco

Corrêa

Freire

Ferreira

et al. 2010

Rev. bras. eng. agríc. ambient.

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RESUMOSolos sob clima semiárido têm sido degradados pela salinização, reduzindo a capacidade produtiva. Objetivou-se com este trabalho, avaliar atributos físicos dos solos de um perímetro irrigado no semiárido do Nordeste do Brasil e comparar diferentes usos utilizandose esses atributos. O trabalho foi desenvolvido no perímetro irrigado Icó-Mandantes, entre Petrolândia e Floresta, sertão de Pernambuco, no qual as populações foram estratificadas de acordo com os usos em áreas com culturas de ciclo curto (C), fruticultura (F), pastagem (P), áreas descartadas (D) e com vegetação nativa (V). Coletaram-se amostras de solo deformadas e indeformadas nas camadas de 0-10, 10-30 e 30-60 cm, para determinação dos atributos físicos. Os indicadores foram submetidos à análise multivariada, pela técnica de componentes principais e agrupamento pelo método Tocher. O uso agrícola promoveu alterações nos atributos físicos dos solos em relação à vegetação nativa. A qualidade do solo para os atributos físicos variou entre as camadas de 0-10 e 10-30 cm, exceto para o uso V, com qualidade similar nessas camadas. Os usos F e P indicaram melhor qualidade física do solo em relação ao uso C, de 0-10 e 10-30 cm, e o uso D mostrou a pior qualidade do solo nas camadas avaliadas.Palavras-chave: qualidade do solo, manejo do solo, vegetação nativa Physical attributes of soil under different uses with irrigation in semiarid Pernambuco ABSTRACT Soils in semiarid climate regions had been degraded by salinization, reducing their productive capacity. This work aimed to evaluate physical attributes of soil in an irrigated perimeter in the semiarid Northeast of Brazil and to compare different soil uses using these attributes. The study was carried out at Icó-Mandantes Irrigated Perimeter, between Petrolândia and Floresta, in semiarid region of Pernambuco, in which the populations were separated by their uses in annual crops (C), fruticulture (F), discarded lands (D), pasture (P), native vegetation (V). Undisturbed and disturbed soil samples were collected, in layers of 0-10, 10-30 and 30-60 cm, for physical analysis. The indicators were submitted to multivariate analysis, by Principal Component Analysis, and clustering by the Tocher method. The agricultural use promoted alterations in the physical attributes of soil in relation to soil under native vegetation. The soil quality for the physical attributes varied between the layers of 0-10 and 10-30 cm, except in use V, sohich presented similar quality in these layers. F and P uses had presented better physical soil quality than C use in the layers of 0-10 and 10-30 cm and D use presented the worst soil quality in the evaluated layers.

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Effects of conservation and conventional tillage systems after land clearing on soil properties and crop yield in Santa Cruz, Bolivia

Cited by 22 publications

References 22 publications

Soil organic matter, biota and aggregation in temperate and tropical soils - Effects of no-tillage

Soil organic matter, biota and aggregation in temperate and tropical soils - Effects of no-tillage

Agricultural management impacts on soil organic carbon storage under moist and dry climatic conditions of temperate and tropical regions

Atributos físicos de solos sob diferentes usos com irrigação no semiárido de Pernambuco

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