Chemical dynamics in slash-and-burn agriculture

Juo, A. S. R.; Manu, Andrew

doi:10.1016/0167-8809(95)00656-7

Cited by 170 publications

(111 citation statements)

References 27 publications

Supporting

Mentioning

103

Contrasting

Unclassified

Order By: Relevance

“…In slash-and-burn agriculture, soil attributes change as a consequence of the deposition of ash from the burned vegetation and increased rates of organic matter decomposition (Juo and Manu, 1996). Over time, nutrients are depleted and these attributes tend to return to their previous state.…”

Section: Discussionmentioning

confidence: 99%

Changes in land use alter the structure of bacterial communities in Western Amazon soils

et al. 2009

View full text Add to dashboard Cite

Here we show how agricultural practices by indigenous peoples as well as forest recovery relate to the structure and composition of Amazon soil bacterial communities. Soil samples were collected in different land use systems and bacterial community composition and diversity were explored by T-RFLP, cloning and sequencing, and data were analyzed with multivariate techniques. The main differences in bacterial community structure were related to changes in the soil attributes that, in turn, were correlated to land use. Community structure changed significantly along gradients of base saturation, [Al 3 þ ] and pH. The relationship with soil attributes accounted for about 31% of the variation of the studied communities. Clear differences were observed in community composition as shown by the differential distribution of Proteobacteria, Bacteroidetes, Firmicutes, Acidobacteria and Actinobacteria. Similarity between primary and secondary forest communities indicates the recovery of bacterial community structure during succession. Pasture and crop soil communities were among the most diverse, showing that these land use types did not deplete bacterial diversity under the conditions found in our sites.

show abstract

Section: Discussionmentioning

confidence: 99%

Changes in land use alter the structure of bacterial communities in Western Amazon soils

et al. 2009

View full text Add to dashboard Cite

show abstract

“…Several authors have previously studied the effect on soil after forest removal to make room for crops. Moreira et al (2009) studied the same soils considered in this study regarding their fertility and showed that agricultural soils are mainly related to high base saturation, exchangeable bases and Ca and Mg. Juo & Manu (1996) reported that in slash-and-burn agriculture, soil properties change as a consequence of the deposition of ash from the burned vegetation and increased rates of organic matter decomposition. Over time, nutrients become depleted and these properties tend to return to their previous state.…”

Section: Discussionmentioning

confidence: 99%

Land-use systems affect Archaeal community structure and functional diversity in western Amazon soils

Navarrete¹,

Taketani²,

Mendes³

et al. 2011

Rev. Bras. Ciênc. Solo

View full text Add to dashboard Cite

SUMMARYThe study of the ecology of soil microbial communities at relevant spatial scales is primordial in the wide Amazon region due to the current land use changes. In this study, the diversity of the Archaea domain (community structure) and ammonia-oxidizing Archaea (richness and community composition) were investigated using molecular biology- (H' = 1,9629; D = 0,1715), cultivo agrícola (H' = 1,4613; D = 0,3309) e floresta secundária (H' = 0,8633; D = 0,5405

show abstract

“…In addition, the soil acidity also has a relationship with growing vegetation. A study conducted by Juo and Manu (1996), showed that growing vegetation tended to decrease soil pH, with low nutrient stocks.…”

Section: Discussionmentioning

confidence: 99%

Differences in Soil Physical and Chemical Properties of Rehabilitated and Secondary Forests

Akbar¹

2010

American Journal of Applied Sciences

View full text Add to dashboard Cite

Problem statement:The soil properties of tropical rain forest in Southeast Asia have been characterized by several researchers; however empirical data on soil characteristics under rehabilitation program are still limited or even lacking. This research is important to determine the soil physical and chemical properties of a rehabilitated degraded forest land 19 years after planting with various indigenous species in comparison with adjacent secondary forests and to elucidate the soil fertility status in rehabilitated and secondary forests by using Soil Fertility Index (SFI) and Soil Evaluation Factor (SEF). Approach: Soil samples were collected from both locations which were rehabilitated forest and secondary forest (Nirwana forest) at University Putra Malaysia, Bintulu Sarawak Campus. The plot size of each experimental site was 20×20 m. An auger was used to take soil samples from two depths, namely 0-10 and 10-20 cm. For soil profile, the soil samples were collected from different depths up to 100 cm according to the soil horizons. The samples were airdried, homogenized and sieved to pass a 2 mm mesh sieve for further analysis. The physical analysis consisted of bulk density and soil moisture content. For chemical analysis, soil acidity, soil organic matter, total organic carbon, available P, exchangeable Al, exchangeable ammonium and nitrate, exchangeable cations (Ca, Mg, K) and Cation Exchange Capacity (CEC) were determined. The soil fertility status was determined based on SFI and SEF values for both rehabilitated and secondary forests. Results: The bulk density of the rehabilitated forest ranged between 0.70 and 1.29 g cm −3 and that of the secondary forest was 0.64-0.76 g cm −3 . The soil moisture content of the rehabilitated forest was 23.31-51.03% while that of secondary forest was 41.06-41.49%. The range pH (water) of the rehabilitated forest was 4.5-5.0 and that of the secondary forest range was 4.2-4.3. Furthermore, the content of SOM in the rehabilitated forest was 2.5-5.8%. On other hand, the range for the secondary was 4.1-4.6%. The exchangeable Al of the rehabilitated forest was 0.8-2.5 cmol c kg −1 and that of the secondary forest was 1.6-1.7 cmol c kg −1 . The CEC of the rehabilitated forest was 1.4-11.8 cmol c kg −1 , while that of the secondary forest was 4.3-4.5 cmol c kg −1 . Based on SFI and SEF values, the secondary forest had a lower fertility status compared to the rehabilitated forest. Moreover, the SEF value of the secondary forest was below 5, while some of the plots of rehabilitated forest had the SEF values greater than 5. Conclusion: It can be concluded that both rehabilitated and secondary forests have significant differences based on selected physical and chemical properties. Moreover, the soil fertility status at rehabilitated plots was comparatively higher than secondary Am. J. Applied Sci., 7 (9): 1200Sci., 7 (9): -1209Sci., 7 (9): , 2010 1201 forest indicating a good potential of 'Miyawaki' forest rehabilitation technique in rehabilitating and replenishing soil fe...

show abstract

Chemical dynamics in slash-and-burn agriculture

Cited by 170 publications

References 27 publications

Changes in land use alter the structure of bacterial communities in Western Amazon soils

Changes in land use alter the structure of bacterial communities in Western Amazon soils

Land-use systems affect Archaeal community structure and functional diversity in western Amazon soils

Differences in Soil Physical and Chemical Properties of Rehabilitated and Secondary Forests

Contact Info

Product

Resources

About