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    A novel protocol for assessment of aboveground biomass in rangeland environments

    Access Status
    Open access via publisher
    Authors
    Mundava, C.
    Schut, A.
    Helmholz, Petra
    Stovold, R.
    Donald, G.
    Lamb, D.
    Date
    2015
    Type
    Journal Article
    
    Metadata
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    Citation
    Mundava, C. and Schut, A. and Helmholz, P. and Stovold, R. and Donald, G. and Lamb, D. 2015. A novel protocol for assessment of aboveground biomass in rangeland environments. Rangeland Journal. 37 (2): pp. 157-167.
    Source Title
    Rangeland Journal
    DOI
    10.1071/RJ14072
    ISSN
    1036-9872
    School
    Department of Spatial Sciences
    URI
    http://hdl.handle.net/20.500.11937/3888
    Collection
    • Curtin Research Publications
    Abstract

    Current methods to measure aboveground biomass (AGB) do not deliver adequate results in relation to the extent and spatial variability that characterise rangelands. An optimised protocol for the assessment of AGB is presented that enables calibration and validation of remote-sensing imagery or plant growth models at suitable scales. The protocol combines a limited number of destructive samples with non-destructive measurements including normalised difference vegetation index (NDVI), canopy height and visual scores of AGB. A total of 19 sites were sampled four times during two growing seasons. Fresh and dry matter weights of dead and green components of AGB were recorded. Similarity of responses allowed grouping into Open plains sites dominated by annual grasses, Bunch grass sites dominated by perennial grasses and Spinifex (Triodia spp.) sites. Relationships between non-destructive measurements and AGB were evaluated with a simple linear regression per vegetation type. Multiple regression models were first used to identify outliers and then cross-validated using a ‘Leave-One-Out’ and ‘Leave-Site-Out’ (LSO) approach on datasets including and excluding the identified outliers. Combining all non-destructive measurements into one single regression model per vegetation type provided strong relationships for all seasons for total and green AGB (adjusted R2 values of 0.65–0.90) for datasets excluding outliers. The model provided accurate assessments of total AGB in heterogeneous environments for Bunch grass and Spinifex sites (LSO-Q2 values of 0.70–0.88), whereas assessment of green AGB was accurate for all vegetation types (LSO-Q2 values of 0.62–0.84). The protocol described can be applied at a range of scales while considerably reducing sampling time.

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