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Relationships between the factors reflecting ecological health function of urban forests.

GUO Er-guo1,2,3,4, WANG Cheng1,2**, QIE Guang-fa1,2, CAI Yu3   

  1. (1Research Institute of Forestry of Chinese Academy of Forestry, Key Laboratory of Forest Silviculture of the State Forestry Administration, Beijing 100091, China; 2Research Center of Urban Forest, State Forestry Administration, Beijing 100091, China; 3Huhhot Research Institute of Environmental Science, Huhhot 010030, China; 4Huhhot Environment Monitoring Station, Huhhot 010030, China)
  • Online:2013-11-10 Published:2013-11-10

Abstract: A 24-hour seasonal observation was conducted on the 4 factors reflecting urban forest ecological heath function (decreasing atmospheric particulate matters (PMs), declining airborne microbes, increasing aeroanions, and increasing biogenic volatile organic compounds (BVOCs)) in three typical urban forests in West Mountain of Beijing, and an analysis was made on the interrelationships between these factors, aimed to understand the ecological health function of urban forest. There existed close relationships between these four factors. The four sizes of atmospheric PMs had significant positive relationships each other, among which, PM2.5 and PM1.0 had the highest correlation, followed by total suspended particulate (TSP) and PM10. The larger the difference in particulate size, the weaker the correlation was. The airborne bacteria were significantly positively correlated with the PMs, especially with the TSP. The aeroanions had a negative relationship with the PMs, and this relationship became stronger when the particulate size increased. The aeroanions had inhibitory effect on the airborne microbes, and this effect was more obvious on bacteria than on fungi. In Platycladus orientalis and Cotinus coggygria forests, BVOCs played definite roles in inhibiting airborne microbes and increasing aeroanions, and also, had definite association with PMs, but these effects varied with the components of BVOCs.

Key words: soil microbial community, simulated warming, alpine timberline, nitrogen and phosphorous, phospholipid fatty acid., soil carbon