中国生态农业学报2017，Vol.25Issue(11)：1643-1652,10.DOI:10.13930/j.cnki.cjea.170300
不同养分配比对高粱根系生长及养分吸收的影响
Effect of different nutrient combinations on root growth and nutrient accumulation in sorghum
摘要
Abstract
Sorghum, one of the important grains in the world, can grow well in low fertility soils. In order to understand the response of nutrient accumulation and root growth in sorghum to N, P and K stresses, a long-term experiment consisting of 5 treatments (NPK, PK, NK, NP and CK) under conditions of sorghum/maize rotation system was initiated in 2011. The indi-vidual treatments of the experiment ensured differences in availability of soil N, P and K before sowing sorghum in 2016. The results showed that compared with NPK treatment, PK treatment increased total root length by 18.29% and decreased total root volume by 26.53%. Also under PK treatment, sorghum root distribution was mainly in the 0-10 cm soil layer. The proportion of fine roots with diameter less than 0.5 mm increased significantly under PK treatment. Compared with NPK, total length, total surface area and total root volume of sorghum decreased respectively by 24.03%, 27.48% and 41.29% under NK treat-ment. Without K (i.e. under NP treatment), the growth of fine roots was inhibited. Removal of either N or P or K decreased the accumulation of the corresponding element in sorghum. It was recommended not to induce N or limit N and K translocation from vegetative organs to grains. Both the combinations NK and NP inhibited the transfers of N, P and K to grain from vege-tative parts. The accumulation and translation of N, P and K were regulated by root morphology. There were significant rela-tionships between both N and K accumulation and individual root parameter (total root length, total root surface area and total root volume). Compared with P and K accumulation, N accumulation in sorghum had an obviously correlation with both N translocation from vegetative organs to grains and aboveground biomass. In summary, the response of root morphology and nutrient accumulation in sorghum to individual N, P or K stress was different. The results were useful for the cultivation of sorghum in marginal soils.关键词
高粱/养分配比/根系生长/养分吸收/养分运转Key words
Sorghum/Nutrient combination/Root growth/Nutrient uptake/Nutrient translocation分类
农业科技引用本文复制引用
崔佩佩,刘鹏,刘佳琪,王劲松,武爱莲,董二伟,丁玉川,焦晓燕..不同养分配比对高粱根系生长及养分吸收的影响[J].中国生态农业学报,2017,25(11):1643-1652,10.基金项目
国家现代农业产业技术体系项目(CARS-06-13.5-A20)、山西省农业科学院优势课题组项目(YYS1707)和高粱遗传与种质创新山西省重点实验室项目(2016K-03)资助 This work was supported by the China Agriculture Research System (CARS-06-13.5-A20), the Key Research Group Projects of Shanxi Academy of Agricultural Sciences (YYS1707) and the Key Laboratory of Shanxi Province of Heredity Innovation of Sorghum Germplasm Resources (2016K-03). （CARS-06-13.5-A20）
