ACTA AGRICULTURAE BOREALI-SINICA ›› 2018, Vol. 33 ›› Issue (5): 188-194.

Special Issue: Soil fertilizer

### Effects of Long-term Fertilization on Reclaimed Soil Aggregate Stability and Distribution of Carbon in the Southeastern Shanxi Mining Area

LI Jianhua1,2, LI Hua3, GAO Chunhua2, ZHANG Qiang2, JIN Dongsheng2, LU Jinjing2

1. 1. Institute of Resources and Environment Engineering, Shanxi University, Taiyuan 030006, China;
2. Institute of Agricultural Environment and Resources, Shanxi Academy of Agricultural Sciences, Taiyuan 030031, China;
3. College of Environmental & Resource Sciences, Shanxi University, Taiyuan 030006, China
• Received:2018-01-11 Published:2018-10-28

Abstract: To explore the aggregate stability and organic carbon distribution characteristics of reclamation soil in the Southeastern Shanxi Mining Area under different fertilization,the long-term located trials with eight years were conducted to study the amount, stability and organic carbon distribution of soil aggregate. The test consisted of four fertilizer treatments,no fertilization (CK),chemical fertilizer (NPK),combination of low organic fertilizer and chemical fertilizers (LOF) and combination of high organic fertilizer and chemical fertilizers (HOF). The results showed that the application of fertilization significantly increased the number of large aggregates (> 0.25 mm),HOF treatment significantly increased the proportion of aggregate at each particle size, the effects on the particle size of 2-1 mm and 0.50-0.25 mm aggregates were highest with the HOF treatment. The average weight diameter (MWD) and geometric mean diameter (GMD) of the aggregates were significantly increased and the fractal dimension (D) of soil aggregates was significantly reduced by the HOF and LOF treatments,which improved the stability of soil aggregates. There was not significant difference between HOF and LOF,and NPK had no significant influence on the fractal dimension. The organic carbon content of each particle size aggregate of>0.25 mm was higher than that of<0.25 mm,and the large aggregate was rich in organic carbon. The application of HOF significantly increased the contribution rate to soil nutrient of 5-2 mm and 2-1 mm particle size aggregate. There was a significant positive correlation between soil organic carbon (SOC),large aggregate number (R0.25),MWD,GMD and aggregates >0.25 mm particle size,respectively. SOC and R0.25,MWD,GMD were a very significant positive correlation. Therefore,in the Southeastern Shanxi Mining Area reclaimed,the application of high organic fertilizer and chemical fertilizers (HOF) is the effective method to improve soil organic carbon content and enhance the stability of soil aggregates.

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