Spatial variability in litterfall, litter standing crop and litter quality in a tropical rain forest region

Parsons, Scott A., Congdon, Robert A., Shoo, Luke P., Valdez-Ramirez, Vanessa, and Williams, Stephen E. (2014) Spatial variability in litterfall, litter standing crop and litter quality in a tropical rain forest region. Biotropica, 46 (4). pp. 378-386.

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Abstract

Understanding the spatial variability in plant litter processes is essential for accurate comprehension of biogeochemical cycles and ecosystem function. We assessed spatial patterns in litter processes from local to regional scales, at sites throughout the wet tropical rain forests of northern Australia. We aimed to determine the controls (e.g., climate, soil, plant community composition) on annual litter standing crop, annual litterfall rate and in situ leaf litter decomposability. The level of spatial variance in these components, and leaf litter N, P, Ca, lignin, α-cellulose and total phenolics, was determined from within the scale of subregion, to site (1 km transects) to local/plot (~30 m2). Overall, standing crop was modeled with litterfall and its chemical composition, in situ decomposability, soil Na, and topography (r2 = 0.69, 36 plots). Litterfall was most closely aligned with plant species richness and stem density (negative correlation); leaf decomposability with leaf-P and lignin, soil Na, and dry season moisture (r2 = 0.89, 40 plots). The predominant scale of variability in litterfall rates was local (plot), while litter standing crop and α-cellulose variability was more evenly distributed across spatial scales. Litter decomposability, N, P and phenolics were more aligned with subregional differences. Leaf litter C, lignin and Ca varied most at the site level, suggesting more local controls. We show that variability in litter quality and decomposability are more easily accounted for spatially than litterfall rates, which vary widely over short distances possibly in response to idiosyncratic patterns of disturbance.

Item ID: 36197
Item Type: Article (Refereed Research - C1)
Keywords: Australia, climate, decomposition, litter quality, litter standing crop, litterfall, spatial variability, tropical rain forest
ISSN: 1744-7429
Funders: Earthwatch Institute, Skyrail Rainforest Foundation, Queensland Government Smart State, Marine and Tropical Sciences Research Facility (MTSRF), James Cook University School of Marine and Tropical Biology, Queensland Parks and Wildlife Service (QPWS)
Date Deposited: 12 Nov 2014 11:00
FoR Codes: 06 BIOLOGICAL SCIENCES > 0602 Ecology > 060208 Terrestrial Ecology @ 100%
SEO Codes: 96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960806 Forest and Woodlands Flora, Fauna and Biodiversity @ 100%
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