Aluminium Mobilization from Acidic Forest Soils in Leigongshan Area, Southwestern China: Laboratory and Field Study

Guo, Jian; Vogt, Rolf D.; Zhang, X.; Zhang, Y.; Seip, H. M.; Xiao, Jianhua; Tang, Hongxiao

doi:10.1007/s00244-003-0151-0

Cited by 12 publications

(10 citation statements)

References 24 publications

(21 reference statements)

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“…The non-crystalline inorganic Al and the highly stable organoaluminium complexes were not correlated with the dissolved Al. Some authors consider that highly stable organoaluminium complexes are the principal source of soluble aluminium, while exchangeable Al regulates Al solubility during soil acidification processes (Guo et al 2006). However, in the present study, the organic matter appeared to play an important role in withdrawing Al from the solution and fixing it in the highly stable complexes, which are more abundant in the rhizospheric zone.…”

Section: Aqueous Aluminiummentioning

confidence: 64%

Aluminium geochemistry in the bulk and rhizospheric soil of the species colonising an abandoned copper mine in Galicia (NW Spain)

et al. 2010

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Purpose Aluminium partitioning in the solid fraction and aluminium in solution in the bulk and rhizospheric soil of different plant species colonising an abandoned Cu mine slope (Calluna vulgaris, Erica cinerea and Salix atrocinerea) and mine dump (C. vulgaris and E. cinerea) were investigated. The aim of the study was to determine the changes that the species induce in the Al forms in the rhizosphere in order to adapt to heterogeneous substrates. Materials and methods Al was extracted from the solid phase with different solutions: ammonium oxalate (Alo), sodium pyrophosphate (Alp), copper chloride (Alcu), lanthanum chloride (Alla) and ammonium chloride (AlNH 4 ). The following Al fractions were obtained: inorganic non-crystalline Al (Alop=Alo-Alp), highly stable organoaluminium complexes (Alpcu=Alp-Alcu), organoaluminium complexes of intermediate stability (Alcula= Alcu-Alla) and labile organoaluminium complexes (Alla). The concentration of Al present in the aqueous phase was also determined. Results and discussion The pH of the soil in the mine slope was close to 7, and the roots of Ericaceae caused strong acidification so that the pH of the rhizospheric soil was low (3.6-4.7). In contrast, the pH of the bulk and the rhizospheric soil of S. atrocinerea remained close to 7. In the mine dump (pH3.7), the changes in the pH of the Ericaceae rhizosphere in relation to the bulk soil were not as marked as in the mine slope. Alop predominated in the solid phase (more than 70% of the Alo), and Alpcu predominated in the organoaluminium complexes (more than 55%), followed by Alcula (13% and 47%) and Alla (3% and 21%). The concentration of Al in solution was significantly related to the concentrations of AlNH 4 (r=0.43), Alla (r=0.50) and Alcula (r=0.45). Conclusions Ericaceae species grew in dump and slope materials because they modified the pH of the rhizospheric soil, while S. atrocinerea only grew in areas where the soil conditions were close to neutral. The concentration of aluminium fractions was higher in the Ericaceae rhizosphere soil than in Ericaceae bulk soil, S. atrocinerea rhizosphere and bulk soils. Moreover, highly stable organoaluminium complexes predominated, and the dissolved Al concentration was low, despite the strong acidity.

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Section: Aqueous Aluminiummentioning

confidence: 64%

Aluminium geochemistry in the bulk and rhizospheric soil of the species colonising an abandoned copper mine in Galicia (NW Spain)

et al. 2010

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“…This means that higher AlS and lower BS will increase the Al concentration in soil solution. Guo et al (2006) showed that in soils with lower AlS and higher BS, more mobilized Al was retained in soil as exchangeable Al. With the (Fig.…”

Section: Pls Regression Analysismentioning

confidence: 99%

“…Elevated Al concentrations in soils, streams and lakes is a potential threat to both terrestrial and aquatic organisms due to the toxicity of certain Al species (Driscoll et al, 1980;Andersson, 1988). In China, high Al concentrations induced by acid deposition have also been reported (see Guo et al, 2006;Xue et al, 2003). Based on laboratory experiments and limited field monitoring, the significance of some possible influencing factors have been documented by several specific studies (i.e.…”

Section: Introductionmentioning

confidence: 99%

Evaluating main factors controlling aluminum solubility in acid forest soils, southern and southwestern China

Guo

Zhang

Vogt

et al. 2007

Applied Geochemistry

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The mechanism controlling Al solubility in Chinese acidic forest soils is not clearly understood. This is the main limitation to the ability to generate adequate dose-response prediction models of the ecological effect of acid rain. To evaluate the relative significance of possible processes, soils and soil solutions from five forest catchments, located in southern and southwestern China, were collected and analyzed for chemical parameters. Monitoring showed that inorganic Al (Al i ) was the dominant fraction in most soil solutions; organic Al (Al o ) was usually less than 10% of total monomeric Al (Al a ). Aluminum fractions varied significantly between and within the different sites, though appearing to follow a similar pattern. Over the entire pH range of 3.6-5.6, the pAl (i.e. Àlog of the Al 3+ activity) closely correlated with solution pH, following regression slopes of 1.28 and 2.00 for upper and lower soil horizons, respectively. The variations in Al 3+ activity could not be explained satisfactorily using mineral dissolution equilibria. Partial least square (PLS) regression showed that soil acidity (quality) and ionic strength (intensity) of the solution were the main explanatory variables for the variation in the concentration of Al fractions. Aluminum in upper horizons originated from both organic and inorganic solid Al pools, while aqueous Al in lower horizons was dominantly of inorganic origin. Aluminum solubility was strongly influenced by cation exchange, especially in the upper horizon. In the upper horizon, ionic strength (I) had a greater influence on Al solubility due to cation exchange reaction. In the lower horizon, dissolution of inorganic Al pools by the elevated H + concentrations was the main Al release mechanism. So Al activity was more dependent on H + (or pH) in the lower horizon.

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“…Leaching and batch experiments were used by e.g. Guo et al (2006) and Bohan et al (1997Bohan et al ( , 1998. Solutions acidified via mineral acids (H 2 SO 4 , HNO 3 , HCl) up to approximately 3.5 pH are usually used as leaching media.…”

mentioning

confidence: 99%

“…Solutions acidified via mineral acids (H 2 SO 4 , HNO 3 , HCl) up to approximately 3.5 pH are usually used as leaching media. Guo et al (2006) concluded that strongly organically bound Al is the main source of aqueous Al, whereas exchangeable Al plays an important role in regulating Al solubility during soil acidification. Soil organic carbon and soil water pH are considered as the key factors in Al release determination.…”

mentioning

confidence: 99%

Laboratory assay of aluminium transport through intact soil sample under controlled conditions

Batysta¹,

Borůvka²,

Drábek³

et al. 2010

Soil & Water Res.

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Aluminium (Al) mobilisation in the forest soils is a serious problem due to the soil acidification. The rate and magnitude of leaching of Al and other elements and compounds from soils can be examined by means of percolation experiments. Aluminium elutriation was studied under laboratory conditions using undisturbed samples of forest topsoil from the Paličník area in the Jizera Mountains (Czech Republic), which originated under two different vegetation covers: European beech (Fagus sylvatica L.) and Norway spruce (Picea abies (L.) Karst). Ponding infiltration was performed using three subsequently applied solutions. KCl solution was used to simulate the soil solution. Solutions with sulphates and nitrates addition (of two different pH values) were used to simulate acid rainfall. Passing liquid phase was analysed with respect to Al content and aluminium speciation. Differences were found in Al content and transport between different soils under spruce and beech covers. The soil sample under the spruce forest (SF sample) had a higher initial Al content than the soil sample under the beech forest (BF sample). As a result, the aluminium leaching from the spruce soil sample and the final content of water-extractable Al in the soil (Al content after the leaching experiment) were higher compared to the beech soil sample. This suggests that Al mobility and potential toxicity in the beech forest are grater than those in the spruce monoculture when studied in the acidification endangered areas.

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Aluminium Mobilization from Acidic Forest Soils in Leigongshan Area, Southwestern China: Laboratory and Field Study

Cited by 12 publications

References 24 publications

Aluminium geochemistry in the bulk and rhizospheric soil of the species colonising an abandoned copper mine in Galicia (NW Spain)

Aluminium geochemistry in the bulk and rhizospheric soil of the species colonising an abandoned copper mine in Galicia (NW Spain)

Evaluating main factors controlling aluminum solubility in acid forest soils, southern and southwestern China

Laboratory assay of aluminium transport through intact soil sample under controlled conditions

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