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    Estimating Aboveground Net Primary Production in Grasslands: A Comparison of Nondestructive Methods

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    Author
    Byrne, Kerry M.
    Lauenroth, William K.
    Adler, Peter B.
    Byrne, Christine M.
    Issue Date
    2011-09-01
    Keywords
    cost optimization
    double sampling
    handheld radiometer
    mixed-grass prairies
    point-frame
    shortgrass steppe
    
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    Citation
    Byrne, K. M., Lauenroth, W. K., Adler, P. B., & Byrne, C. M. (2011). Estimating aboveground net primary production in grasslands: a comparison of nondestructive methods. Rangeland Ecology & Management, 64(5), 498-505.
    Publisher
    Society for Range Management
    Journal
    Rangeland Ecology & Management
    URI
    http://hdl.handle.net/10150/642895
    DOI
    10.2111/REM-D-10-00145.1
    Additional Links
    https://rangelands.org/
    Abstract
    Aboveground net primary production (ANPP) is an important ecosystem property that is affected by environmental variability. ANPP in grasslands is typically measured by clipping peak live plant material. However, this method is time intensive (and therefore expensive), making it difficult to capture spatial and temporal variability. Additionally, it is impractical to use a destructive method to estimate ANPP in long-term, permanent plots. Thus, many double-sampling techniques have been developed to reduce costs and increase sample size. The objective of our study was to assess the accuracy and precision of nondestructive techniques to estimate ANPP as supplements to the traditional method of peak biomass harvest at two grassland sites. We harvested biomass and compared estimates from the same plots to 1) canopy interception using a point frame, 2) green cover estimates derived from a digital camera, and 3) reflectance measurements using a handheld radiometer. We calculated the optimum allocation of sampling effort to direct and indirect methods to minimize sampling cost yet achieve a desired precision. We found that the point frame technique explained the highest proportion of the variability in biomass at both sites (R2 = 0.91, 0.90). However, our cost-optimization analysis revealed that the radiometer technique, although less accurate (R2 = 0.38, 0.51), could achieve a desired precision for lower labor costs than the point frame. The radiometer and point frame methods will be a useful tool for grassland ecologists and rangeland managers who desire fast, nondestructive estimates of ANPP./La producción primaria neta PPN es una propiedad importante en el ecosistema que es afectada por la variabilidad medioambiental. La PPN en pastizales se mide normalmente por medio de cortes de la parte viva de la planta. Sin embargo, este método consume mucho tiempo (y es caro) haciendo difícil estimar la variabilidad espacial y temporal. Además, es impráctico usar métodos destructivos para estimar la PPN en el largo plazo en parcelas permanentes. Por esto, técnicas de doble muestreo se han desarrollado para reducir el costo y aumentar el taman ̃ o de muestra. El objetivo de nuestro estudio fue evaluar la eficacia y eficiencia de técnicas no destructivas para estimar la PPN como complementos del método tradicional de cosecha de la biomasa en dos tipos de pastizales. Se cosecho la biomasa y se comparo las estimaciones de las mismas parcelas para 1) intercepción del dosel con el método del punto, 2) estimación de la cubierta verde derivada de una cámara digital, y 3) medidas de reflejo usando un radiómetro manual. Calculamos la ubicación óptima de esfuerzo de muestreo por métodos directos e indirectos para reducir el costo de muestreo y lograr la precisión deseada. Encontramos que la técnica del punto explico la mayor proporción de la variabilidad de biomasa en ambos sitios (R2 = 0.91, 0.90). Sin embargo, el análisis optimización-costo revelo que la técnica del radiómetro aunque menos precisa (R2 = 0.38, 0.51) podría lograr la precisión deseada con menor costo que el punto. Los métodos del radiómetro y el punto serán herramientas útiles para ecólogos y manejadores de pastizales que requieren de estimaciones de PPN rápidas y no destructivas.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2111/REM-D-10-00145.1
    Scopus Count
    Collections
    Rangeland Ecology & Management, Volume 64, Number 5 (September 2011)

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