The Study On The Relationships Of Plant Leaf’s Dust Retention And Its C/N/P Ecological Stoichiometry

During green plant leaves photosynthesis, respiration, they have the purification function on the surrounding atmosphere environment to a certain extent, to a certain degree of pollutants in the atmosphere absorb, transformation and migration. Green plant photosynthetic organs have a good dust efficiency, but the dust in the plant leaf surface stranded for a long time to move forward on its surface morphology, physiological and ecological characteristics of a certain impact. Such damage or change or wax layer structure, increase leaf surface cell membrane permeability, change of leaf surface wettability, affect the photosynthetic efficiency, the kinds of leaves and plant internal enzymes activity and physiological characteristics, content, result in toxic effects, adverse effects on plant metabolism and growth and development. In addition, the dust in the foliar long time staying in the leaf environment has a certain degree of shade effect within a small area, influence the internal chemical composition. In the whole of organisms in nature, but also indirectly affect the entire plant internal various chemical elements(C, N, P, K, Na, etc., heavy metals: Zn, Cu, Mg, Ca, Cd, Cr, etc.) of the content and distribution proportion. Namely, influence the plant ecological stoichiometry characteristics.This article applied Ecological Stoichiometry theory, from the perspective of micro elements of plant leaves, to explored the atmospheric dust particles 12 kinds of urban greening tree species leaf dust retention characteristics in the Aksu city, and in-depth analysis: atmospheric dust particles on the surface of plant leaves long influence on the structure of the leaf physiological and ecological effects, atmospheric dust particles and plant leaves and soil C, N and P three main ecological construction elements stoichiometric ratio relationship. The results showed that:(1) Natural conditions, at 4 m height the atmospheric heavy highest in industrial production, the average as follows: 98.21 g/m2 · mon. Followed by transportation hub area(72.33 g/m2 · mon) and living and science areas(57.89 g/m2 · mon), minimum is green cleaning area, as follows: 47.71 g/m2 · mon. at 0.5 m height heavy with the highest transport hub area, the average is: 104.45 g/m2 · mon, green cleaning area is minimum: 52.92 g/m2 · mon. Overall, the 0.5 m height month significantly is greater than 4 m, the difference is: 8.42 g/m2 · mon, this is mainly due to the interference of human activities on the urban environment and the ground.(2) The dust retentions of Aksu city 12 kinds of greening tree species is significant difference between: the maximum is Sabina chinensis(L.) Ant, and the Pinus tabuliformis Carrière is minimal. The dust retention quantity of same species in different urban functional area also show significant differences: The industrial production areas is maximum; Transport hub area is second; Science living area of plant leaf dust retention quantity is relatively small; And the dust retention quantity of greening areas is minimum.(3) There are significant differences among different conductivity of tree leaf of dust retention, the Ulmus pumila L. is maximum, the Pinus tabuliformis Carrière is minimum; the leaf conductivity of Conifer leaf significantly greater than hardwood species. The leaf conductivity of unit quality of the same tree species also showed different degrees differences in different functional areas. Industrial area is significantly higher than other three kinds of functional areas. The traffic activity area and living areas is second, the windbreaks areas and the city park are minimal.(4) Leaf functional traits of the same species in different functional areas that there is a significant difference. the correlation analysis results show that the retention quantity of per leaf area and leaf area are significantly negative correlation, R =-0.663, P < 0.01), and is significantly negative correlation with per leaf quality, R =-0.746, P < 0.05), and is significantly negative correlation with the quality of unit leaf area, R =- 0.620, P < 0.01).(5) There are different degrees correlation relations among the dust retention quantity of unit leaf area and C, N and P elements content in dust and corresponding three kinds of elements content in the leaves: between unit leaf area dust retention quantity and leaf C element content is significantly negative correlation, R =- 0.695(P < 0.05); The average C elements of leaves associated with the average C element content in the dust, R= 0.685, p < 0.05). The dust retention quantity and leaf N element content show significant correlation, R= 0.612(p< 0.05); Their N element content show significant negative correlation, R=- 0.721, p < 0.05). Dust retention quantity with P element content of leaves show significant negative correlation, R=-0.609(P < 0.05), the correlation coefficient: R = 0.585 between P element content(P < 0.05).(6) C element content among plant leaves and dust and soil are significantly positive correlation. Leaves N element content are very significant positive correlation with the soil N, and with dust is significantly positively related. P element content are very significant positive correlation with the P content in soil, and was significantly positive correlation with the dust.(7) There is very large difference suburban districts soil moisture content, soil fertility and the surrounding atmosphere environment. The urban soil N, P fertilizer ratio should be 23.38 advisably, suburban green fertilizer N: P ratio should be less than 56.83 but greater than 19.36 as appropriate.