Land-use change versus natural controls on stream water chemistry in the Subandean Amazon, Peru

Lindell, Lina; Åström, Mats E.; Öberg, Tomas

doi:10.1016/j.apgeochem.2009.12.013

Cited by 33 publications

(14 citation statements)

References 48 publications

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“…However, the increase of swidden cultivation with reduced fallow length has had continued negative effects on forest cover and the degradation of soil fertility in many places (Bogaert et al, 2008;Fox and Vogler, 2005;Lindell et al, 2010;Ludewigs et al, 2009;Tachibana et al, 2001).…”

Section: Impacts On Local Livelihoods and The Environmentmentioning

confidence: 98%

Trends, drivers and impacts of changes in swidden cultivation in tropical forest-agriculture frontiers: A global assessment

Vliet

Mertz

Heinimann

et al. 2012

Global Environmental Change

503

409

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Section: Impacts On Local Livelihoods and The Environmentmentioning

confidence: 98%

Trends, drivers and impacts of changes in swidden cultivation in tropical forest-agriculture frontiers: A global assessment

Vliet

Mertz

Heinimann

et al. 2012

Global Environmental Change

503

409

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“…Since river water chemistry exhibits significant spatio-temporal variability, depending on the geologic environment, physical system and biotic responses, data collected from different sites of a river basin during different seasons can be used to model the possible relationships between chemical composition of the surface water and their controlling factors (e.g., Ahearn et al 2004;Lindell et al 2010). The studies on spatio-temporal patterns in river water chemistry are also important for sustainable management of river basins (Meyer et al 1988;Petts and Calow 1996;Xie et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Hydrogeochemical Drivers and Processes Controlling Solute Chemistry of Two Mountain River Basins of Contrasting Climates in the Southern Western Ghats, India

Thomas

Joseph

Thrivikramji

2015

Environmental Management of River Basin Ecosystems

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Water samples were collected from two mountain rivers of contrasting climates, viz., humid, Muthirapuzha River Basin (MRB) and semi-arid, Pambar River Basin (PRB) during monsoon (MON), post-monsoon (POM) and pre-monsoon (PRM) seasons, and were analyzed to understand the spatio-temporal variability as well as the sources and processes controlling hydrogeochemistry. In MRB and PRB, Ca 2+ and Mg 2+ dominate the cations, while Cl − dominates the anions in MRB and HCO 3 − dominates the anions in PRB. PRB shows an elevated level of ionic abundance and higher degree of mineralization, due to multiple factors such as semiaridity, discharge dominated by groundwater, lithological variations and the influences of carbonates and soil evaporites. However, K + , Cl − and H 4 SiO 4 are relatively higher in MRB, implying significance of both anthropogenic activities and intense silicate weathering. The Ca 2+ + Mg 2+ /HCO 3 − ratios in MRB are also relatively larger than PRB, suggesting high intensity of anthropogenic influences in MRB. Downstream variation of hydrogeochemistry implies a general decreasing trend in MRB, which is attributed to dilution due to high discharge, whereas hydrogeochemistry of PRB shows an increasing downstream trend, by which, the significance of semi-arid climate of the downstream tracts of the basin is implied. Both MRB and PRB show temporal variability in hydrogeochemical attributes implying the role of monsoon rainfall determining stream water composition. − (with respect to Na + ) indicates multiple sources for Cl − (i.e., anthropogenic as well as atmospheric). Even though there are significant differences in water types between MRB and PRB, most of the waters of both the basins are considered to be "transitional". Relatively higher pCO 2 in stream waters (compared to atmosphere) is observed and the phenomenon is attributed to the influent nature of the stream discharge (i.e., contributed by groundwater which is significantly enriched in CO 2 ) and the slower rate of re-equilibration (i.e., solubility vs. release of CO 2 ) with atmosphere. Hence, evidently the hydrogeochemical composition of MRB and PRB is jointly controlled by weathering of silicate and carbonate minerals as well as anthropogenic activities and is influenced by climatic seasonality. The spatiotemporal variability of hydrogeochemical attributes of MRB and PRB is mainly due to the variations in climate, lithology, hydrologic pathways and degree of various anthropogenic activities.

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“…This consisted of an annual removal by mowing of regenerated understory vegetation within the rosewood plantations. New areas for planting rosewood were prepared by cutting and burning the existing vegetation, a method practiced widely within the Amazon basin [48] (see Table A1 for more details about study sites).…”

Section: Field Sampling and Laboratory Methodsmentioning

confidence: 99%

Sequential Management of Commercial Rosewood (Aniba rosaeodora Ducke) Plantations in Central Amazonia: Seeking Sustainable Models for Essential Oil Production

Krainovic

Almeida

Desconci

et al. 2017

Forests

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Rosewood (Aniba rosaeodora Ducke) is an endangered tree that produces essential oil of high commercial value. However, technical-scientific knowledge about cultivation is scarce and studies are needed to examine the management viability. The current study evaluated rosewood aboveground biomass management, measuring the export of nutrients resulting from harvesting and testing sustainable management models. The crown of 36 rosewood trees were pruned and 108 trees cut at 50 cm above the soil in two regions in Central Amazonia. Post-harvest performance of sprouting shoots was evaluated and after, sprouting shoots were pruned so that the development of two, three and all shoots was permitted. Nutrient stock estimation was calculated as the product of mass and nutrient concentration, which allowed nutritional replacement to be estimated. The pruning facilitates regrowth by 40.11% of the initial mass while by cut regrow 1.45%. Chemical attributes of regrowth biomass differed significantly prior to management and regrowth had a significant correlation with the reserves in root tissues and with the pre -management status of the individual tree. Driving sprouts resulted in significantly larger growth increments and may provide a form of management that can viably be adopted. Biomass sequential management resulted in high nutrient exports and the amount of fertilizer needed for replenishment depended on the intensity and frequency of cropping. Compared with the cut of the tree, pruning the canopy reduces fertilizers that are required to replenish amount by 44%, decreasing to 26.37% in the second rotation. The generated knowledge contributes to this silvicultural practice as it becomes ecologically and economically viable.

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Land-use change versus natural controls on stream water chemistry in the Subandean Amazon, Peru

Cited by 33 publications

References 48 publications

Trends, drivers and impacts of changes in swidden cultivation in tropical forest-agriculture frontiers: A global assessment

Trends, drivers and impacts of changes in swidden cultivation in tropical forest-agriculture frontiers: A global assessment

Hydrogeochemical Drivers and Processes Controlling Solute Chemistry of Two Mountain River Basins of Contrasting Climates in the Southern Western Ghats, India

Sequential Management of Commercial Rosewood (Aniba rosaeodora Ducke) Plantations in Central Amazonia: Seeking Sustainable Models for Essential Oil Production

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