Litter cover as an index of nitrogen availability in rehabilitated mine sites

Matthew Todd, Pauline Grierson, M.A. Adams

    Research output: Contribution to journalArticle

    14 Citations (Scopus)

    Abstract

    The spatial heterogeneity of litter cover and bioavailability of nitrogen within a 9-year-old rehabilitated bauxite mine in south Western Australia was examined. Three replicate plots (6 m by 6 m) were each divided into 100 quadrats. Litter cover, vegetation distribution, and projected foliage cover were mapped, and litter (overstorey leaves, understorey leaves, and other assorted fractions) and soil (depth: 0-5, 5-10, and 10-30 cm) were sampled from within each quadrat. Litter distribution reflected projected foliage cover, and accumulated within microtopographic depressions. Distribution of soil nitrate (NO3-) reflected the distribution of litter. The N-15 natural abundance (delta(15)N) values of soil (0-5 cm) and the understorey litter fraction were significantly correlated (R-2 = 0.529, P <0.05), whereas carbon isotope composition (delta(13)C) of soil (0-5 cm) was significantly correlated with the distribution of the assorted litter fraction (R-2 = 0.296, P <0.05). It is concluded that site preparation practices that effect microtopography, such as contour ripping and revegetation along contours, will have a significant impact on nitrogen (N) distribution and bioavailability within rehabilitated mine sites.
    Original languageEnglish
    Pages (from-to)423-433
    JournalAustralian Journal of Soil Research
    Volume38
    DOIs
    Publication statusPublished - 2000

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