| The composition of municipal solid waste landfill soil is complex. Content of organic matters, heavy metals are high. Improved old landfill soil with planting soil,litter and zeolite for urban landscaping and landfill ecological restoration has certain economic benefits and ecological benefits. In this experiment, we determination the soil nutrients and heavy metals in the Garbage Landfill soil of1995,2000,2005. The planting soil,zeolite and litter will be mixed with Phases of landfill soil by a certain percentage, to improve the garbage soil. Take the garbage soil and its improved soil as the experimental soil, take the Nerium oleander, Elaeagnus pungens, Cinnamomum camphora, Ligustrum Lucidum, Distylium racemosum, Photinia serrulata six greening plants seedlings as the experimental seedlings, set the pot experiment in the experimental greenhouses.3months after planting, respectively, in the summer of2010, autumn of2010, spring of2011, the summer of2011, the fall of2011, Determined the seedling leaf photosynthetic indicators, and determined plant fluorescent indicators, physiological and chemical indicators the summer of2011. The results showed that:1. The heavy metal pollution of Closure of soil is serious, excessive nutrients, including arsenic, copper, cadmium, zinc, and the EC, organic matter, hydrolytic nitrogen, total nitrogen is about10times as the planting soil, The differences of different landfill soil factor is not significant inter-annual changes did not show a certain regularity.2.6kinds of shrub tree seedlings are planted in the landfill soil, due to the complex composition of garbage soil, nutrient levels, heavy metal content of the public security, a variety of factors combined stress made the plant water utilization decline, the physiological and chemical indicators lower, the photosynthetic system was damaged,the photosynthetic process, the process of chlorophyll fluorescence is suppressed in a certain degrees.3. The Plant photosynthesis may be limited by stomatal factors or the non-stomatal factors.In spite of Components of waste soil have stress on plant photosynthesis, but degree is not the same, For the oleander and privet, stress reduced the degree of photosynthetic capacity of less than stomatal factors, photosynthesis is limited by stomatal factor; Elaeagnus, camphor, mosquito mother, heather stress makes the optical system is destroyed, reduced the degree of photosynthetic capacity than stomatal factors limit photosynthesis is mainly affected by the non-stomatal factors.4. Plant photosynthesis of grown in garbage soil has changed with the seasons and show a certain regularity:The Pn of summer is higher than the fall and spring. The same quarter, the second year after planting Pn higher than the year of Pn.5. Different improvement methods have different Influence on plant photosynthesis Garbage soil, after improved by planting soil, the Pn of plant,(?)PSII, ETR and qP, the indicators have increased with the proportion of the planting soil increasing; the condition of Litter improved soil is relatively useful for plant photosynthesis, plant photosynthetic capacity is greatly improved; the quality of zeolite improved soil is poor, having some damage to the plant light system, a significant decline in the photosynthetic capacity of each plant is not conducive to plant growth. Three kinds of improved methods:the litter improvement is better than the planting soil improvement, better than the zeolite modified.6. The stress of each component of garbage soil, making the the PSH of plant was damaged, photosynthetic capacity Suffer from inhibition. In the six kinds of plants, the oleander is inhibited relatively weak, mosquitoes mother heather are relatively strong. The soil environment in which each plant seedling photosynthesis relative best:Mosquito mother, heather photosynthetic capacity in the garbage solid in1995, the privet, Elaeagnus photosynthesis in the2000garbage soil, camphor oleander photosynthesis compared with the best in the2005garbage solid. |
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