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Remediation of Pb/Cd-Contaminated Forest Soils by Compost and Mycorrhizae:will it be a solution to the Forest Dieback?

Gunadasa HKSG1Nissanka SP2Perera SP3

1. Postgraduate Institute of Agriculture, University of Peradeniya, Sri Lanka2. Faculty of Agriculture, University of Peradeniya, Sri Lanka3. Rubber Research Institute, Agalawatta, Sri Lanka

摘要:Horton Plains is an upper montane forest in Sri Lanka that acts as the most important water catchment of the island.Soil pollution and forest dieback (FDB) have become the major threat for this sensitive natural ecosystem.Increasing vehicle emissions in the nearby cities and the rain polluted with Pb and Cd falling on forest soils has been the key focus of the study.In the experiment,twenty-four permanent plots were established within an area of 61-80% dieback severity and three soil amendments through addition of (a) compost,(b) montane mycorrhizae,and (c) compost and montane mycorrhizae,alongside the control made up the four treatments used in this study.Treatments were applied to five randomly selected Sysygium rotundifolium saplings of approximate height of 1m and 0.015m diameter breast height (DBH) residing in each plot.Soil organic matter content (SOM) and Pb and Cd were compared from soil samples collected at 0.2m depth.These comparisons were done for samples collected at three different stages and during the experimental period,the selected saplings were closely monitored and changes in health were accordingly recorded.The soil analysis shows clear indications of Pb and Cd contamination which impairs plant metabolism leading to dieback.Effect of standard compost and montane mycorrhizae on protecting saplings from Pb and Cd was significant (p = <0.001).Moreover,compost and mycorrhizae appeared to be effective in reducing the effect of Pb and Cd on sapling’s mortality.Significant decline of Cd (p = 0.01) and Pb (p = 0.01) with the increasing SOM level were observed.
会议名称:

2012 International Conference on Future Environment and Energy(ICFEE 2012)

会议时间:

2012-02-26

会议地点:

Singapore

  • 专辑:

    工程科技Ⅰ辑

  • 专题:

    环境科学与资源利用

  • 分类号:

    X53

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