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The Study of Physiological Property of the Rye in the Polluted Soil of Hg and Cd and the Absorption Discipline to Hg and Cd

Author: HeJianJun
Tutor: LiYunFeng
School: Chang'an University
Course: Environmental Science
Keywords: Soil Heavy Metal Pollution The mercury cadmium their interaction Rye Nutritional elements Physiological characteristics
CLC: X53
Type: Master's thesis
Year: 2009
Downloads: 133
Quote: 1
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Abstract


The soil is one of the valuable natural resources is a necessary condition for human survival and development. However, a variety of man-made and natural factors makes human survival of soils subjected to varying degrees of pollution, resulting in the degradation of the original soil physical and chemical properties, the loss of agricultural value, and endangering the food chain safety and human health, the thesis of \Qinling Gold Mine dual River Bridge watershed soil heavy metals pollution and environmental effect \join the HgCl 2 analog contaminated soil 3CdSO 4 · 8H 2 O configuration aqueous solution simulation contaminated soil, planting roots is well developed, can In the short time depletion of bio-active ingredients of the various elements in the soil, and the fast-growing rye plants. In order to carry out the experiment, according to the concentration gradient of soil environmental quality standards \separate and interactions under physiological characteristics and rye rye plant growth and development of the two heavy metal elements absorb mercury cadmium preliminary exploration of the law. , Explore rye as the possibility of the degree of soil heavy metals pollution monitoring plant through the rye physiological characteristics. Explore the general law of the mercury cadmium absorption through the rye, to reveal composite pollution and its mechanism of ecological effects of heavy metals like mercury and cadmium, soil environmental quality assessment and take soil pollution remediation measures has a very important significance. The above experimental procedure and data analysis, the results showed that: ① The soil adsorption of mercury cadmium increases with its corresponding concentration, adsorption rate was gradually decreasing trend, taken in the experimental soil and heavy metals added mercury cadmium soil mercury, cadmium theoretical maximum adsorption amount for 588.2mg/kg 156.26mg/kg, in the experimental soil conditions, regardless of whether the mercury cadmium concentration increase the theoretical maximum concentrations were calculated by Langmuir equation adsorption amount unchanged. ② mercury cadmium and its interaction rye seed germination potential, germination rate, average plant height, stem and leaf fresh weight, chlorophyll and rye leaf plasma have some reduction, inhibition or to undermine the role of rye the appearance of the physiological characteristics such as (fresh weight, plant height) and indirect physiological characteristics such as (chlorophyll and conductivity) can be used to reflect the degree of mercury cadmium contaminated soil poisoned. Rye seeded mercury cadmium contaminated soil after germination rate greater than 90%, can not be used to reflect the rate of emergence as a physiological characteristics of rye rye in the extent of mercury cadmium contaminated soil poisoned. The paper also by adding nutritional elements N fertilizer PK fertilizer greenhouse pot experiment, to further explore the soil heavy metals mercury cadmium alone and cross contamination of rye physiological grown in soil quality indicators and their rye absorb mercury cadmium. Fertilization pot experiment results showed that: ① The facilities PK fertilizer rye its growing, stems and leaves of fresh weight, chlorophyll content as well as the degree of plasma membrane damage better than N fertilizer, rich in the heavy metal the mercury cadmium in the soil, in order not to the soil abandoned the cultivation of high-quality forage rye pasture on which to alleviate the effects of heavy metals on rye growth and through the application of the right amount of PK fertilizer. ② If to repair soil heavy metals mercury and cadmium pollution, by planting rye in the soil to absorb a certain amount of heavy metals like mercury cadmium, of rye roots mercury cadmium amount much larger than the stems and leaves of mercury cadmium uptake, indicating black Jimmy can play a role in curing heavy metals like mercury and cadmium, the effect is more pronounced after a certain amount of N fertilizer in the planting case.

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CLC: > Environmental science, safety science > Environmental pollution and its prevention > Soil Contamination and Control
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