| It has become cosmopolitan common attention study on subject about aluminum stress lead to of agriculture and forestry production loss problem,aluminum stress is from soil acidification,soil acidification concentration manifestations on the tropical and subtropical,but the temperate area according to report.Yellow red soil and red soil is acid soil,it widely distribution in china,it is a main factors on aluminum toxicity about agricultural production and ecological environment.It is one of the most important fruit production base in immigrant demonstration area with karst topography in northwest of guangxi.Soil quality direct effect fruit production and environmental problems.Aluminum activity is increased because of the soil acidification.It is very important to Aluminum toxicity of the soil improvement is the theoretical foundation,The guidance of farming and fertilizing, soil in the area understand the activity of aluminum and aluminum shape the form of spatial variation is very important.Al activity in the form of soil spatial variability of the study on the environmental northwest Guangxi resettlement area of orchards in this study,through field survey sampling,analysis and in the computer room on the application of space ArcGIS9.2 software and statistical analysis functions and Methods,including analysis of the contents of the exchange of aluminum.The main findings are as follows:pH value of the distribution in the soil.pH value of around 3.50-5.50 in general, strongly acidic soil and acidic soil for the sum of 95.5%,pH value lower,basically following the 5.00,5.00 and above in for a very small number.It seems that on the whole orchard soil acidity is very low in northwest Guangxi environment resettlement areas,it easily lead to the release of aluminum,the plant produced aluminum poisoning.The distribution of organic matter in the soil.Organic matter is an important indicator of the impact of the activity of aluminum in the soil,organic matter and activity can produce aluminum complex,which can reduce the activity of the aluminum content.It seems on the whole a very low content of organic matter in soil.Changes in the shape of aluminum in the soil.Exchangeable aluminum,hydroxy aluminum,aluminum-organic complexation Although the volume of less than 2 per cent of total aluminium,it is more active part,in accordance with the activation of aluminum solid phase chemical forms that are being implemented in the soil. Exchangeable aluminum content 123.95-2282.56mg/kg,the mean 917.29 mg/kg,the larger of variation is 54.31%higher variability,adsorbed hydroxy aluminum content 726.33-2246.39 mg/kg,the mean 1439.44mg/kg,the coefficient of variation is 21.24% belong to the middle variation,organic of complex aluminum is 59.73-837.16 mg/kg, the mean 346.75 mg/kg.Relatively small changes in pH,value is 3.92-5.63 with an average of 4.60.The area was strongly acidic soil was showed that the coefficient of variation and the coefficient of variation in the minimum pH.Grading on the form of aluminum in the soil profile.Soil profile at all levels of various forms of aluminum larger coefficient of variation,in particular the exchange of 0-40 cm soil absorption of aluminum and aluminum-hydroxy were significantly less than 40 cm high content of the soil.The relationship between the activity of aluminum and pH,organic matter in soil.Exchangeable aluminum and aluminum hydroxy-absorbed and the pH value was significantly negative correlation with the Al-organic complex pH value of no significant correlation,in addition to the exchange of state aluminum in the soil with organic matter was negatively correlated,absorbed aluminum and organic complexation State and aluminum in the soil organic matter is positively correlated.Spatial variation of the various forms of aluminum in the soil.Kriging interpolation used to choose spherical model of the three forms of aluminum for interpolation,by pH,organic matter,the exchange of aluminum,absorbed hydroxy aluminum,aluminum-organic complex spatial variation map. |
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