| This paper studied the adsorption of phosphorus analytic characteristics of soil (0～10cm) and river sediments on five land use patterns (dry land,grassland,mixed forest, fir forest, bamboo forest) in Shang li river in Ya’an by balancing the shock method, and study the adsorption kinetics of the adsorption of phosphorus and phosphorus resolution process changes in morphology at the phosphorus concentration was 5mg/L, and the content of Al-P, Fe-P, O-P, Ca-P. Discussed the relationship between adsorption of phosphorus with the soil properties.It would provide theoretical reference on governancing water soil phosphorus pollution and optimizing land use patterns.The main findings are as follows:1、The soil in the study area ranged between 6.08～7.58, belong neutral acidic soil. The average content of OM, total phosphorus, and available phosphorus were 39.46g/kg, 34.64g/kg,10.51g/kg, the organic matter of grassland and total phosphorus were highest, the available phosphorus of dry land also were highest in all. The classification of soil phosphorus showed:Ca-P is the main form of soil inorganic phosphorus.the relationship of all kinds of land use typies on the classification of phosphorus is: Ca-P>Fe-P>O-P>Al-P.2、The study found that the Langmuir equation could matching soil and sediment to adsorption of phosphorus better in the area. The results showed that the maximum amount of phosphorus absorption in sediment was higher than soil, while the average soil K, MBC, EPC0 were higher than the sediment, and the maximum content appear in mixed forest, which indicating that mixed forest had an well capacity of adsorption phosphorus. The correlation analysis showed that:K and Feox, MBC and Feox, Alox levels were positively correlated, the correlation coefficients were:0.509**,0.520**, 0.385**. EPCo and available phosphorus,total phosphorus content was also positively correlated, the correlation coefficients were:0.302*,0.318*. The average disadsorption of fir forest was highest, the average disadsorption of grassland was minimum. The disadsorption rate and soil pH showed a significant negative correlation, the correlation coefficient was-0.283*.3、Phosphorus adsorption of soil and sediment occurred before two hours adsorption mainly, the initial adsorption rate of the fastest mixed forest. Research shows the two-level dynamics equation could matching the characteristics of adsorption dynamic of the area than the primary equationand, the obtained qe1, qe2 maximum in mixed forest; k1, k2 maximum in deposition matter. Correlation analysis showed that, qe1, qe2, k1,k2and organic matter showed a significant negative correlation, the correlation coefficients were:-0.539*,-0.432**,-0.616**,-0.427**, qe1, qe2 and soil pH was significant negative correlation,the correlation coefficients were:0.413**,0.504**.4、The results showed that the trends of average content of phosphorus adsorption and analytical with soil and sediment were:grassland> bamboo forest> mixed forest> dryland> sediment> fir forest. The largest changeamounts of adsorption and parsingis O-P, the minimumwas Ca-P, which was associated with the chemical stability of Ca-P. After the adsorption, the net remain in the soil of Fe-P was largest, the O-P was the lowest.5、To evaluating the adsorption and analytical,the study used the main factor analysis method.The main controlling factor in the study area is K and MBC, and the main factors controlling of the adsorption CaCO3, activated alumina, the cumulative contribution rate is49.53%, and with the direct effect of the main factors to disadsorption the contribution rate is only 14.48%, we can see more clearly than parsing adsorption effect. Therefore, according to the actual situation in Ya’an region, increase the mixed land use in proportion, reducing erosion and non-point source pollution caused by the phosphorus phosphorus. |
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