干旱地区农业研究2016，Vol.34Issue(2)：96-101,181,7.DOI:10.7606/j.issn.1000-7601.2016.02.15
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
摘要
Abstract
Effects of different rotation sequences on the distribution of soil organic matter and available micronutri-ents 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 avail-able micronutrients not only effected by the total amount of soil micronutrients ,but also related with the crop rotation se-quences .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 oth-er 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 .关键词
黄土高原/轮作/有机质/有效态微量元素Key words
loess plateau/rotation/organic matter/available micronutrients分类
农业科技引用本文复制引用
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):96-101,181,7.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 （）
