Effect Of Lead And Copper In Soil On Growth Of Ipomoea Aquatica Forsk And Artemisia Selengensis Turcz

Vegetables are necessary food for daily life, they are also important economic crops, however, at the same time in the development of vegetable production, as a result of environmental pollution and unreasonable agricultural practices, vegetables are being contaminated. The pollution of lead and copper can disserve the quality and safety of vegetables, harm to human health and environment, reduce the competitiveness in domestic and foreign markets of vegetables.In the pot experiment, with Ipomoea aquatica Forsk and Artemisia selengensis Turcz as tested material, soils were amended with different lead and copper additions to investigate the effect of lead and copper on the plants growth, photosynthesis and physiological and biochemical indexes, the main results as following:(1) Different heavy metals can generate different effect on the same vegetable, and the same kind of heavy metal can generate different effect on different vegetables. Lead can accelerate the weight and high of Ipomoea aquatica Forsk when the consistency is low, but it can’t effect Artemisia selengensis Turcz. Lead can restrain the growth of Ipomoea aquatica Forsk and Artemisia selengensis Turcz; Copper can’t effect Ipomoea aquatica Forsk and Artemisia selengensis Turcz when the consistency is low, but it can restrain the growth of Ipomoea aquatica Forsk and Artemisia selengensis Turcz when the consistency is high; Under the conditions of this experiment, the effect of lead and copper combined pollution on Ipomoea aquatica Forsk and Artemisia selengensis Turcz is more severity than single pollution.(2) Different apparatus of Ipomoea aquatica Forsk and Artemisia selengensis Turcz can absorb different amounts of lead and copper, overall, most lead and copper centralize in the root of Ipomoea aquatica Forsk and Artemisia selengensis Turcz. Root of Ipomoea aquatica Forsk can absorb more copper than leaf, and leaf can absorb more than culm. The absorb of Ipomoea aquatica Forsk and Artemisia selengensis Turcz on lead is more difficulty than copper, root of Ipomoea aquatica Forsk can absorb more copper than culm, and culm can absorb more than leaf, and root of Artemisia selengensis Turcz can absorb more copper than leaf, and leaf can absorb more than culm; Ipomoea aquatica Forsk can absorb more copper than Artemisia selengensis Turcz. The concentration of lead and copper in root, culm and leaf of Ipomoea aquatica Forsk and Artemisia selengensis Turcz have relations with the concentration of lead and copper in soil.(3) Under the conditions of lead and copper single pollution, the net photosynthesis speed, stomatal conductance and transpiration rate of the leaves of Ipomoea aquatica Forsk and Artemisia selengensis Turcz tended to decline after rose with the concentration of lead and copper in soil higher and higher, the results indicated that lead and copper can accelerate the photosynthesis of Ipomoea aquatica Forsk and Artemisia selengensis Turcz, and it can restrain photosynthesis when the consistency is high. The effect of lead and copper combined pollution on photosynthesis of Ipomoea aquatica Forsk and Artemisia selengensis Turcz is more severity than single pollution.(4) Lead and copper single and combined pollution can effect the physiological and biochemical indexes of Ipomoea aquatica Forsk and Artemisia selengensis Turcz. Lead can advance the activity of SOD and POD of Ipomoea aquatica Forsk and Artemisia selengensis Turcz when the consistency is high, but it useless when the consistency is low. The impact of Lead and copper single and combined pollution on Ipomoea aquatica Forsk is greater than Artemisia selengensis Turcz. Lead and copper can increase the content of MDA and Pn, reduce the activity of NR, and can effect membrane permeability and the content of praline.