Study on form distribution of soil iron in western Jilin and its correlation with soil properties

Transcription

1 GLOBAL GEOLOGY Vol. 35 No. 2 Jun A > B > C > D > E > F > G A A CEC B ph C E A C D G B C D P595 S A doi /j. issn Study on form distribution of soil iron in western Jilin and its correlation with soil properties LIANG Shuo 1 LI Yue-fen 1 TANG Jie 2 WANG Yue-jiao 1 LI Qing-yu 1 1. College of Earth Sciences Jilin University Changchun China 2. College of Environment and Resources Jilin University Changchun China Abstract Through investigating 50 surface soil samples of three agricultural and pastoral areas Taonan City Tongyu County and Qian an County in western Jilin the authors explored form distribution and the relations between soil properties and soil iron form. The results show there exist 7 forms of iron including residual phase A > Fe -Mn oxide phase B > humic acid phase C > carbonate phase D > strong organic phase E > water solubility phase F > exchangeable phase G. A is the main form in soil of western Jilin and the average iron content of soil is lower than the background value in China. There is a significantly positive correlation between Caption Exchange Capacity CEC and A soil ph and B soil organic matter content and C E. Soil mineral elements are significantly correlated with A. C D and G are the next. The relations in different forms of soil iron show that B C and D have significantly positive correlations with each other while the other forms have little correlation. Key words iron form soil properties western Jilin yfli@ jlu. edu. cn

2 DD ~ ~ ~ 20 cm 40 ~ kg ± ph XRF -X NaOAc - ph CEC ph DD WS 3 EXC CARB WOM CBD SPSS SOM RES ~ mm 6 ~ RSD RSD 30% ~ mm 3. 4 ~ Excel SPSS19. 0

3 2 595 Table 1 1 n = 50 Statistics of soil properties in the studied area n = 50 /% ~ CEC /cmol kg ~ ph ~ /% ~ CEC /cmol kg ~ ph ~ /% ~ CEC /cmol kg ~ ph ~ mg kg ~ mg kg mg kg mg kg mg kg mg kg Table 2 2 Total iron content of soil in western Jilin /mg kg - 1 /mg kg ~ ~ ~ ~ Table 3 3 Content and percentage of different forms of soil iron in western Jilin /mg kg - 1 /% /mg kg - 1 /mg kg - 1 /% /mg kg ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~

4 mg kg % > % ~ % mg kg % > ~ mg kg mg kg % > 0. 01% ~ 0. 03% mg kg % > ~ mg kg mg kg % > mg kg % > mg kg % % % ~ % 10 > > > > > > 50 4 Table 4 4 Forms and content of iron in different types of soil n = 3 /mg kg - 1 n = 7 n = 3 n = 37 /% /mg kg - 1 /% /mg kg - 1 /% /mg kg - 1 /% CEC ph 5 CEC ph mg kg - 1 > mg kg - 1 > mg kg - 1 > mg kg

5 2 597 Table 5 5 Pearson correlation analysis between soil iron forms and soil factors ** ** CEC ** ph * ** * ** Table 6 6 Pearson correlation analysis between various forms of soil iron and total content of mineral elements As Se Al Ca Na Mn K Mg * ** ** * ** ** ** * ** ** * * ** ** * ** ** * ** ** ** ** ** * ** Na As Se 2. 3 Al Mg Al Ca Mg Al 7 7 Na Se Al Ca Mg 4 Na 7 3 Table 7 7 Pearson correlation analysis between various forms of soil iron * * * * ** ** * ** * **

6 ph ph ph 3. 8% 1% ~ 4% % mg kg - 1 ph 2. 74% 11 ph mg kg - 1 Fe ~ mg kg ph % % ~ 80% ~ mg kg mg kg mg kg > > > > > > ph CEC 15 CEC

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