Comparison of plant and bacterial communities between a subtropical landfill topsoil 15 years after restoration and a natural area. (May 2017)

• Record Type: Journal Article
• Authors: Chen, Xun-Wen; Wong, James Tsz-Fung; Leung, Anna Oi-Wah; Ng, Charles Wang-Wai; Wong, Ming-Hung
• Is Part Of: Waste management. Volume 63(2017)
• Page Start: 49
• Page End: 57
• Publication Date: 2017-05
• Subjects: Man-made ecosystem -- Plant -- Soil bacterial community -- Sanitary landfill -- Restoration -- Nutrients cycling; Hazardous wastes -- Periodicals; Refuse and refuse disposal -- Periodicals; 363.728
• DOI: 10.1016/j.wasman.2016.08.015
• Languages: English
• ISSNs: 0956-053X

Abstract

Highlights: Plant and soil bacterial communities at landfill were different from those at natural area. The engineered landfill was not restored similarly to natural area in 15 years. A lower plant but a higher soil bacterial diversity were observed at landfill. Soil bacterial community was driven by soil pH, moisture content, CEC, N and P. Abstract: Engineered sanitary landfills are becoming more and more common worldwide. Ecosystem restoration of capped sanitary landfills is essential to restore the disturbed environment. Comparing plant communities, as well as bacterial communities, in landfills and natural areas, offers an efficient way to assess the restoration status. However, such studies on the restored engineered landfills are limited. Here we present an ecological restoration case in an engineered landfill in a subtropical region. Part of the South East New Territories (SENT) landfill in Hong Kong was capped and restored, by using 16 plant species growing on top of the final cover soil, during 1997–1999. In 2014, plant survey and soil properties analyses were conducted in a restored site (AT) and a natural site (CT, an undisturbed area, serving as a control). The similarity between the biota communities (i.e., plant and soil bacteria) of the two sites was assessed. Plant and soil bacterial communities at AT were significantly different (R = 1, P < 0.01, ANOSIM) from those at CT. A lower plant diversity but a higher soil bacterial diversity were observed at AT. The soil bacterial community structure was potentially driven by soil pH, moisture content, cation exchange capacity (CEC), N, and P. The engineered landfill had not been restored to an ecosystem similar to the natural environment 15 years after restoration. Establishing similar soil properties in the landfill topsoil would be important to achieve a bacterial community similar to the natural area. This study can also offer a quick and inexpensive method for landfill engineers to assess the bacterial restoration of man-made ecosystems using plant and soil properties rather than DNA analyzing techniques.