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Ipomoea under cadmium stress on soil manganese zinc , calcium and magnesium absorption and accumulation

Author: ZhangJuan
Tutor: WangGuo
School: Fujian Agriculture and Forestry University
Course: Environmental Science
Keywords: Soil Ipomoea Cadmium Nutrients Absorb Shift
CLC: X173
Type: Master's thesis
Year: 2011
Downloads: 62
Quote: 0
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Abstract

In this paper, soil culture experiments to cadmium toxicity vegetables --- Ipomoea highly sensitive ecological receptors, the effects of exogenous conditions, adding different concentrations of cadmium and cadmium on the absorption of nutrients spinach (iron, manganese, copper, zinc, calcium , magnesium) and these nutrients in the soil - water spinach transferred between systems by studying the pattern. The main results are as follows: 1, on the whole, water spinach vegetable and root cadmium content in the upper soil between an effective amount of cadmium showed highly significant positive correlation. With the increase of cadmium content of soil, water spinach cabbages lines to gradually increase the amount of cadmium accumulation; Ipomoea cabbages - leaf cadmium transfer coefficient with an effective amount of cadmium in the soil and roots between the cadmium content was significantly negatively correlated, indicating that with soil cadmium content increases, water spinach cadmium from the roots to the aerial parts of metastatic ability decreases; roots - stem and leaf Cd transfer coefficient between fresh weight was significantly positive correlation. 2, each of Cadmium on soil nutrient uptake differ: in stems and leaves, calcium and magnesium content and soil cadmium content was significantly positive correlation; in roots, zinc, calcium and magnesium content with soil cadmium content increases, iron, manganese, copper content showed a \3, each of cadmium in soil nutrients have different effects on the effectiveness. With an effective increase in the amount of soil cadmium, manganese and iron soil showed an increasing trend in an effective amount, and an effective amount of copper is gradually reduced, the effective amount of zinc did not change significantly. 4, cadmium stress on the spinach transfer of each nutrient has a significant impact: With the added amount of cadmium increased soil - root iron, manganese and copper transfer coefficient increased first and then decreased; roots - stem Zinc effective transfer coefficient between the amount of cadmium in the soil was significantly negative correlation; concentration increased with increasing soil cadmium, iron, manganese and copper from water spinach stems and leaves of cabbages system to transfer coefficient showed a rising trend after the first drop, high- concentrations of cadmium (Cd dosage ≥ 5 mg · kg ^{-1 to the root - stems and leaves of calcium and magnesium have significant role in promoting the transfer of root - shoot Cd transfer coefficient with the root - shoot zinc transfer coefficient showed a significant positive correlation between; in the root - stems and leaves, iron, manganese and copper, with the transfer of the transfer coefficient Cd decreased first and then increased. 5, zinc Ipomoea cabbages - the transfer of stems and leaves and stem between leaves and root fresh weight was significantly positive correlation; roots - copper leaf with root fresh weight transfer has decreased firstly and then increased; shoot and root biomass of calcium, magnesium, iron, and Manganese in water spinach cabbages - stems and leaves no effect the transfer.}

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