| Effects of different rotation sequences in cultivation on the distribution of soil organic matter and available micronutrients on loess plateau |
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| DOI：10.7606/j.issn.1000-7601.2016.02.15 |
| Key Words: loess plateau rotation organic matter available micronutrients |
| Author Name | Affiliation | | LI Long | College of Resource and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China | | WEI Xiao-rong | State Key Laboratory of Soil Erosion and Dry Land Farming on the Loess Plateau, Northwest A&F University, Yangling, Shaanxi 712100, China | | HAO Ming-de | College of Resource and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China
Institute of Soil and Water Conservation, Northwest A & F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| Effects of different rotation sequences on the distribution of soil organic matter and available micronutrients were studied using potassium dichromate volumetric method and DTPA extraction-atomic absorption method on the basis of long-term experiment of Shilipu village of Changwu county. The results showed that the distribution of soil available micronutrients not only effected by the total amount of soil micronutrients, but also related with the crop rotation sequences. From surface soil to deep soil of different rotation sequences, the content of soil organic matter decreased first and then increased slowly, it continuously increased of the content of soil available Fe, the content of soil available Mn and Zn decreased gradually, the content of soil available Cu increased first and then decreased slowly. In the 80～100 cm soil layer, the content of organic matter of the cereal-forage rotation (CFR) was 11.08～11.89 g·kg-1 and the clover-legumes rotation(CLR) was 11.04～11.72 g·kg-1. The content of soil available Fe and Mn were lower than other crops of the CFR in the third years of wheat, planting alfalfa and potato could effectively increase the content of soil available Mn in CFR, continuous wheat cropping and alfalfa cropping could decrease the content of soil available Zn and Mn. The content of soil available Fe was higher than that of the CLR in the crops of wheat with broomcorn millet and the content of soil available Mn was the lowest of the CLR in the crops of wheat, and it average lower 7.73%～30.55% the crops of wheat with broomcorn millet and the crops of legumes. It was higher than CLR of the soil available micronutrients of CFR, there were great difference of the soil available micronutrients in CFR and CLR above 80cm soil layers, but the difference between CFR and CLR was reduced below 80 cm soil profiles. |
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