| Soil characteristics of urban green space is an important factor affecting the growth of landscape trees. Through select Wenjiang District representative of four different functional areas of soil and landscaping green trees Cinnamomum japonicum (Sieb). as objects by analyzing the nutrient content of different areas Cinnamomum japonicum (Sieb). leaves, nutrient use efficiency, nitrogen and phosphorus ratio changes, initially identified Cinnamomum japonicum (Sieb). nutrient status, combined with regional soil properties, provide a theoretical basis for improve soil conservation and management of landscape trees in Wenjiang District. 1 Wenjiang soil characteristicsWenjiang District, urban green soil is larger disturbed by human factors. Lack of natural soil developmental level, firm, high density, most alkaline, with a significant nitrogen deficiency,relatively rich in phosphorus and potassium and phosphorus distribution is extremely irregular, vary greatly in different locations. Determination of the regions under tree crown top soil (0-10cm) was found:the average bulk density of 1.623 g/cm, pH average of 7.3 and a conductivity of 306.9μs/cm. Four functions of inorganic nitrogen content in the range of area green trees green 41.922-44.591 mg/kg, roadside green 57.213-84.29 mg/kg, residential green 45.699-53.437 mg/kg, parks 45.427-53.262 mg/kg; effective phosphorus content in the range of trees green 6.563-7.819mg/kg, roadside green 2.333-2.923 mg/kg, residential green 14.86-17.489 mg/kg, parks 13.06-15.739 mg/kg; potassium content of 148.431-green trees 168.422mg/kg, roadside greenery of 152.671-159.580 mg/kg, green residential area of 170.227-182.350 mg/kg, green parks of 177.770-188.196 mg/kg. For this study selected four functions Wenjiang district of soil fertility quality of urban green preliminary evaluation showed that the quality of the four functional areas from high to low, green parkland, green residential area, roadside green, green trees. 2 Cinnamomum japonicum (Sieb). nutrient characteristicsFour kinds of plots, Cinnamomum japonicum (Sieb). inorganic nitrogen content of leaves up to the roadside greenery 16.858mg/g, the lowest Trees green 8.384mg/g, the average content of 10.514mg/ g; phosphorus content of up to neighborhood green 1.703 mg/g, a minimum of roadside greenery 0.537 mg/g, the average content of 0.968 mg/g, potassium up to parkland 0.852 mg/g, the lowest for the trees green 0.645 mg/g, the average content of 0.746 mg/g.All regions Cinnamomum japonicum (Sieb). of NUEN and NUEp linear relationship was significant, NUEN and NUEp and NUEp with NUEK linear correlation was not significant. There was no significant linear correlation R= 0.306 (P> 0.05) between NUEN and soil inorganic nitrogen content. NUEp and soil phosphorus content was a significant negative correlation R=-0.747 (p<0.01), also showed the soil K content between NUEK significant negative correlation R=-0.836 (P<0.01). Description Cinnamomum japonicum (Sieb). nitrogen use efficiency less affected by the nitrogen content of the soil, and in phosphorus and potassium are relatively barren soil nutrients more obvious adjust their strategies to adapt to the growing environment.Residential green space and parkland Cinnamomum japonicum (Sieb). leaf N:P ratio is less than 14, indicating Cinnamomum japonicum (Sieb). constrained by the obvious effect of nitrogen in the growth process; trees leaf green Cinnamomum japonicum (Sieb). N:P ratio of between 14 to 16, indicating that these regions Cinnamomum japonicum (Sieb). together by limiting nitrogen and phosphorus; while roadside greenery Cinnamomum japonicum (Sieb). leaf nutrient N:P ratio is greater than 16, then reflect these regions Cinnamomum japonicum (Sieb). strong phosphorus limitation. 3 Soil improvement measures in the cityWenjiang District in soil fertility evaluation is based on the actual situation and Cinnamomum japonicum (Sieb). green soil nutrient status, have the structure and characteristics of the targeted improvement of soil nutrients. Focus on soil quality planting trees green pools, trees species diversity of choice, as well as post-artificial cultivation, fertilization, watering and other management. Roadside green artificial improve soil structure and fertility was based on the configuration for a variety of plants, plants to enhance the resilience of the urban environment, and to make use of breathable pavement. Soil improvement of residential areas to pay special attention to avoid construction waste and household waste contaminated soil green. Soil improvement parks should give full play to the larger parkland area, the plant is relatively diverse advantages. Mimic the natural cycle of plant and soil structure, complex patterns of plant configuration, and take advantage of a lot of litter plant manufacturing organic fertilizer for soil quality improvement. |
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