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Effect of P Incorporation on P Accumulation Characteristics, Physiological and Biochemical Mechanism of Polygonum Hydropiper

Author: HuangXia
Tutor: LiTingXuan；ZhangXiZhou
School: Sichuan Agricultural University
Course: Plant Nutrition
Keywords: Phytoremediation Water smartweed Ecotype Enrichment Phosphorus content Acid Phosphatase Phytase
CLC: X173
Type: Master's thesis
Year: 2011
Downloads: 22
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Abstract

High levels of water-soluble phosphorus in surface runoff is the main reason for the eutrophication of water bodies has become a hot research environmental issues worldwide. Select the the the phosphorus enrichment plant recycling phosphorus in the soil and sewage purification has become today's international bioremediation hot research and cutting-edge. This study through the indoor simulation experiments, validation of phosphorus enrichment of the two ecotypes water smartweed, reveals the enrichment of phosphorus nutrition physiological and biochemical mechanisms of the different ecotypes water smartweed. The main findings are as follows: 1 in soil culture conditions, with the increase in the concentration of soil phosphorus, the mine ecotypes water smartweed aboveground biomass increased dramatically, not mine ecological biomass phosphorus concentration of 200 mg / kg sharp decline, after reaching the maximum the mining ecotype biomass was significantly higher than the non-mining ecotypes, and the difference was significant increase with increasing phosphorus concentration. Phosphorus concentration of 100mg/kg, 200mg/kg, 400mg/kg processing, mining ecotype shoot P content were significantly higher than the non-mining ecotypes. The the two ecotypes water Polygonum aboveground P content with increasing soil phosphorus concentrations increased mine ecotype water smartweed shoot P accumulated were significantly higher than the non-mining ecotypes, and with a higher level of concentration of phosphorus processing differences significantly increased, non-mining ecotypes 1.7-3.3 times. Mine ecotype water of Polygonaceae leaves SOD, POD, CAT activity is higher than the non-mining ecotypes, non-mine ecological MDA content is higher than mine ecotype;, the mine ecological water Polygonum root acid phosphatase activity gradually increased with increasing phosphorus concentration mine ecotype significantly higher than the non-mining ecotypes root phytase in the 200 and 1600 mg / kg treatment was significantly higher than the non-mining ecotypes. In nutrient solution culture, the two ecotypes water Polygonum root, stem, leaf biomass and phosphorus content with increasing phosphorus concentration increased, the non-mining ecotype root, stem, leaf phosphorus content were significantly higher than mine ecological type. Which non-mining eco-root, stem, leaf phosphorus content is of Mine Ecological the type of 1.4-1.8,1.3-1.8 and 1.4-2.3, respectively. Aboveground and underground of the non-mining ecotypes P content was significantly higher than mine ecotype. The cumulative amount of non-mining ecotypes underground mine ecotype 1.3-3.9 times the cumulative amount of the above-ground mining ecotype 1.3-1.7 times. Non-mine ecological water smartweed chlorophyll a and b were significantly higher than mine ecological type. With the increase of P concentration gradient of the two ecotypes of root acid phosphatase activity significantly increase the activity was no significant difference between the two ecotypes. Two ecotypes root phytase activity compared, in addition to 800 mg / L of phosphorus treatment, root phytase activity in non-mining ecotypes are significantly greater than mine ecotype mine ecotype 2.6-3.8 times. Two livestock wastewater treatment, the two ecotypes water smartweed total nitrogen (TN), total phosphorus (TP) and soluble phosphate (PO34-P) removal with planting time increases significantly increased (p lt; 0.05), the Mine Ecological water smartweed higher than the non-mining ecotypes removal rate of TN, TP and pO34-P. In the low concentration of livestock wastewater treatment, the two ecotypes water smartweed aboveground biomass difference was not significant. The high concentration of livestock wastewater treatment, mining the ecotypes water smartweed aboveground biomass was significantly higher than the non-mining ecotypes. Two wastewater treatment, the two ecotypes water smartweed aboveground accumulation of nitrogen and phosphorus with planting time increase in a significant increase in mine ecotype significantly higher than the non-mining ecotypes. The two ecotypes water Polygonum root acid phosphatase and phytase activity with the extension of the planting time significantly reduced the the two ecotypes activity of high concentration of livestock and poultry manure processing are higher than the low concentration of livestock wastewater treatment.

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