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Scientia Silvae Sinicae ›› 2015, Vol. 51 ›› Issue (3): 57-64.doi: 10.11707/j.1001-7488.20150308

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Maximum Dust Retention of Main Greening Trees in Arid Land Oasis Cities, Northwest China

Aliya Baidurela1, Umut Halik1,2, Tayierjiang Aishan1,2, Kailibinuer Nuermaimaiti1   

  1. 1. Key Laboratory of Oasis Ecology Xinjiang Uygur Autonomous Region/College of Resources & Environmental Science, Xinjiang University Urumqi 830046;
    2. Faculty of Mathematics and Geography, Catholic University of Eichstaett-Ingolstadt Eichstaett 85071
  • Received:2014-04-04 Revised:2014-05-22 Online:2015-03-25 Published:2015-04-10

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Abstract:

【Objective】 Urban greening trees are an important part of city greening. They purify the atmosphere by capturing the particulate matter, especially in the arid region cities which frequently suffer from dust storms. To reduce the impact of air pollution on people and the ecological environment of the cities, greening tree species which have strong dust retention ability and are suitable to arid conditions should be chosen to the urban greening. In this study, the dust retention ability of several common greening tree species in Aksu, Northwest China, was examined to find out the appropriate species. 【Methods】 Dust retention capacity of Platanus acerifolia, Populus alba var. pyramidalis, Ulmus densa, Fraxinus bungeana, and Salix babylonica were examined in this study; The dust was washed from the leaf surfaces and then weighed by Electronic Scales with an accuracy of 1μg (PTX-FA-210, Shanghai); The individual leaf area was measured by using a Laser Leaf Area Meter (CI-203, USA). Data were subjected to ANOVA with multiple comparisons by using SPSS (version 15.0, Software Co., USA), with the level of significance set at P<0.05. 【Results】 The maximum dust amount per unit leaf area differed among the five tree species and four functional areas, Pl. acerifolia (13.5±0.90 g·m-2) > P. alba var. pyramidalis (12.1±0.87 g·m-2) > U. densa (9.21±0.77 g·m-2) > F. bungeana (7.11±0.43 g·m-2) > S. babylonica (6.96±0.24 g/m2). In the different areas, the dust retention amount showed the descending order as follows, Industrial area (IA) > Transportation area (TA) > Residential area (RA) > Clean area (CA). Our results also showed that in any case ( IA,TA, RA, CA) the leaves at 1 m height retained the most dust and the leaves at 4 m height retained the least dust. Dust retention amount per plant of the five species also differed from each other, Pl. acerifolia (2.6 kg) > P. alba var. pyramidalis (1.7 kg) > F. bungeana (1.4 kg) > U. densa (0.4 kg) > S. babylonica (0.2 kg). 【Conclusions】 The industrial area (IA) was obviously the most severely dust-polluted area and the clean area was the least dust-polluted area. The greatest amount of dust in IA suggested that a greater amount of atmospheric pollutants emitted in the industrial area was locally generated. The smallest amount of dust in CA meant that the dust generated from the urban settings did not significantly affect the suburban area and also lent a support that the dust was not from large-scale atmospheric processes. The dust retention amount per leaf area and per plant of Pl. acerifolia and P. alba var. pyramidalis was higher than other examined species, thus they could be the priority in urban greening.

Key words: urban greening trees, dust retention, multiple comparisons, Arid land, different functional area

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