| 李龙,魏孝荣,郝明德.黄土高原不同轮作次序对土壤有机质和有效态微量元素分布的影响[J].干旱地区农业研究,2016,34(2):96~101 |
| 黄土高原不同轮作次序对土壤有机质和有效态微量元素分布的影响 |
| 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 |
| 中文关键词: 黄土高原 轮作 有机质 有效态微量元素 |
| 英文关键词:loess plateau rotation organic matter available micronutrients |
| 基金项目:国家科技支撑计划重大项目“农田水土保持关键技术研究与示范农田水土保持工程与耕作关键技术研究(2011BAD31B01)；宁夏农业综合开发科技推广项目(NTKJ-2013-03-1) |
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| 中文摘要: |
| 对长武县十里铺村长期定位试验旱地土壤，用重铬酸钾容量法对土壤有机质进行测定，用DTPA浸提-原子吸收法对有效态微量元素进行测定，研究不同轮作次序对土壤有机质和有效态微量元素分布的影响。结果表明，土壤有效态微量元素的分布除受微量元素总量的影响外，还与作物的轮作次序有关。不同轮作次序土壤有机质均呈现先减小后增大的趋势，有效铁由上到下持续增加，有效锰和有效锌呈现上高下低的趋势，有效铜的分布趋势是由上到下先增加后缓慢减少。粮草轮作体系80～100 cm土层有机质含量在11.08～11.89 g·kg-1之间，粮豆轮作体系该土层含量为11.04～11.72 g·kg-1之间。粮草轮作系统中3年小麦的土壤有效铁和有效锰含量较低，种植苜蓿和马铃薯可以提高土壤有效锰含量，连续种植小麦和连续种植苜蓿土壤有效锌和有效铜含量出现下降的趋势。粮豆轮作系统中小麦+糜子茬口土壤有效铁含量较高，小麦茬口的土壤有效锰含量最低，比小麦+糜子茬口和豌豆茬口的含量平均低7.73%～30.55%。粮草轮作系统中土壤有效态微量元素的含量高于粮豆轮作系统，在80 cm以上土层，两个轮作系统中土壤有效态微量元素的含量差异较大，在该土层以下，两个系统间的差异减小。 |
| 英文摘要: |
| 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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