| The scientific management of soil nutrients and reasonable application of fertilizers is an important issue which is related to the agricultural development of our country.Fully understand the soil properties,especially the variation characteristics of the spatial distribution of soil nutrients and master its distribution rule,carries on the quantitative and qualitative analysis of soil nutrient management and is the basis of reasonable,effective and precise fertilization(Liu Xingmei,2003).Occupies the important status in the soil nutrient quality of organic matter and trace elements,but also is of great research significance. This study applies GIS and statistical method to study the Shanting district of Zaozhuang of Shandong province and the distribution of the effective state of trace element content of soil organic matter and its spatial variation law,a preliminary evaluation of the status and control part of the soil nutrient content of soil organic matter and trace elements distribution of impact factor,discusses the feasibility of soil nutrient division management and fertilization. The main research contents and results are as follows:(1) According to the Zaozhuang Shanting 2059 soil samples of organic matter and nutrient content of trace element effective state monitoring results of normal description statistics and data test shows that the effective manganese accord with normal distribution,the rest of the soil property conforms to logarithmic normal distribution; Soil organic matter and available trace elements are medium degree of variation,and combined with the second national soil survey in Shandong province,classification standard of soil nutrients,to understand the status of the nutrient abundant lack in the study area. Variation coefficient of soil organic matter and available soil trace element between 30.97% ~ 62.42%. Average of 12.54 g/kg of soil organic matter, effective manganese average of 24.59 mg/kg, effective zinc average of 0.39 mg/kg, water soluble boron average of 0.38 mg/kg, the average effective copper is 1.25 mg/kg, the average effective iron 20.24 mg/kg, from the point of the mean, in addition to the soil organic matter SOM(the critical value of 20 g/kg), effective zinc(the critical value of 1.0 mg/kg) and water soluble boron(the critical value of 0.5 mg/kg) is lower than the critical value, the effective manganese(the critical value of 15 mg/kg), effective copper(the critical value of 1.0 mg/kg), effective(the critical value of 1.0 mg/kg) of iron content were higher than their respective threshold.Soil organic matter in soil lacks level,which indicates that the study area of the soil fertility quality is low; Trace elements,zinc and effective boron content in the very lack of level,and lack effective iron and manganese is extremely rich and rich level effectively,effective copper in moderate or rich level.(2) Of soil organic matter and available trace elements(Fe, Mn, Cu, zinc, and B) half the function analysis of variance showed that the effective piece of gold value of zinc and the ratio of base station is equal to 1, the soil organic matter is 0.011, effective manganese is 0.048, water soluble state of boron is 0.147, effective copper is 0.092, effective iron is 0.278, besides effective zinc is pure nugget effect, soil organic matter and other trace elements effective space since the correlation is stronger, the structural factors play a leading role.(3) Conclusion based on half variance theory model and parameters: effective zinc and copper determination coefficient R2 smaller effectively, 0.605 and 0.651 respectively; Water soluble state of boron determination coefficient R2 center, 0.815; Soil organic matter, available mn and effective iron determination coefficient R2 were greater than 0.9, especially effective iron determination coefficient R2 is 0.984. Above all, soil organic matter and available soil trace element determination coefficient R2 were greater than 0.6, can better reflect the soil organic matter and soil effective spatial structure characteristics of trace elements.(4) Based on spatial analysis, ordinary kriging interpolation results show that the overall assumes the block distribution of soil organic matter content, total distribution trend is: higher than the northeast, southwest and Shanting terrain change laws are consistent; The spatial distribution of soil trace element content. Soil water soluble boron and available zinc content in the spatial distribution of overall no obvious characteristic; Effective spatial distribution trend of copper is more obvious, on the whole block distribution, the distribution of the total trend of middle high around low; Spatial distribution of soil effective iron and manganese effectively presents obvious low trend from north to south, but effective spatial difference of iron levels is more apparent. Combining with the spatial distribution of soil organic matter and available soil trace element, to partition management of soil elements in the study area, among them, the soil organic matter can be divided into three areas, soil effective nutrient trace elements can be divided into two partitions.(5) The influence factors analysis showed that soil type,top layer texture,slope,land use types and landform types on the influence of soil organic matter are to some extent. Soil type is mainly due to the difference of PSD affect the discretion of the soil organic matter and distribution,with the quality of a material change from sand stick,gradient from low to high,the soil organic matter content increased gradually,the differences in the levels of field management under different land use type is the main reason for the differences of soil organic matter content.In addition,the results showed that soil organic matter content and decreased with the increase of slope.Slope of soil organic matter and the influence of the existing research is not the same,there is a certain deviation,may be associated with human cultivation factors such as soil trace elements,effective state of the five kinds of internal factors on effective zinc and the influence of the spatial distribution of the effective boron is not obvious. Land use type slope and geomorphic types on the spatial distribution of the effective state copper content and has no obvious effect,but the soil type and texture to a certain degree of influence. For effective iron and manganese effectively,in addition to the slope,the other four kinds of structural factors for effective iron and manganese are effectively show the influence of different level,with the influence of effective iron effect is particularly obvious. Slope of high and low content of soil effective state element and has no obvious influence to have a certain influence on the effective iron,iron may be due to the effective medium spatial correlation,crop is smaller than the experimental sample scales,fertilization, management level,the influence of random factors such as the effective iron and other effective state of trace element in the slope under the influence of different difference. |
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