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Effect of atmospheric CO2 concentration and nitrogen application level on absorption and transportation of nutrient elements in oilseed rape.

WANG Wen-ming1, ZHANG Zhen-hua1, SONG Hai-xing1, LIU Qiang1, RONG Xiang-min1, GUAN Chun-yun2,  ZENG Jing1, YUAN Dan1   

  1. (1College of Resources and Environmental Sciences, Hunan Agricultural University/Hunan Provincial Key Laboratory of Farmland Pollution Control and Agricultural Resources Use/Hunan Provincial Key Laboratory of Plant Nutrition in Common University, Changsha 410128, China; 2Hunan Branch of National Center of Oilseed Crops Improvement, Changsha 410128, China)
  • Online:2015-07-18 Published:2015-07-18

Abstract: Effect of elevated atmosphericCO2〖KG*3〗(780 μmol·mol -1) on the absorption and transportation of secondary nutrient elements (calcium, magnesium, sulphur) and micronutrient elements (iron, manganese, zinc, molybdenum and boron) in oilseed rape at the stem elongation stage were studied by greenhouse simulated method. Compared with the ambient CO2 condition, the content of Zn in stem was increased and the contents of other nutrient elements were decreased under the elevated atmosphericCO2 with no nitrogen (N) application; the contents of Ca, S, B and Zn were increased, and the contents of Mg, Mn, Mo and Fe were decreased under the elevated atmosphericCO2 with N application (0.2 g N·kg-1 soil); except the content of Mo in leaf was increased, the contents of other nutrient elements were decreased under the elevated atmosphericCO2 with two levels of N application. Compared with the ambient CO2 condition, the amounts of Ca and S relative to the total amount of secondary nutrient elements in stem and the amounts of B and Zn relative to the total amount of micronutrient elements in stem were increased under the elevatedCO2 treatment with both levels of N application, and the corresponding values of Mg, Fe, Mn and Mo were decreased; noN application treatment increased the proportion of Ca distributed into the leaves, and the proportion of Mg distributed into leaves was increased by the normalN application level; the proportions of Mn, Zn and Mo distributed into the leaves were increased at both N application levels. Without N application, the elevation of atmospheric CO2 increased the transport coefficients of SFe,Mo and SS,B, but decreased the transport coefficients of SMg,Fe, SMg,Mn and SS,Fe, indicating the proportions of Mo, S transported into the upper part of plant tissues was higher than that of Fe, and the corresponding value of B was higher than that observed for S, the corresponding value of Mg was higher than that of Fe and Mn. Under normalN application, the elevation of atmospheric CO2 increased the transport coefficients of SMg,Fe, SMg,Mn and SS,B, but decreased the transport coefficients of SCa,Mg, SFe,Mo and SS,Fe, indicating the proportions of Fe, Mn and Ca transported into the upper part of plant tissues was higher than that of Mg; the corresponding value of B was higher than that observed for S, the corresponding value of Fe was higher than that of Mo, and the corresponding value of S was higher than that of Fe.