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Riparian Plant Material Inputs to the Murray River, Australia

Composition, Reactivity, and Role of Nutrients

^a Cooperative Research Centre for Freshwater Ecology, Univ. of Canberra, ACT 2601 Australia
^b Ecochemistry Lab., Institute of Applied Ecology, Univ. of Canberra, ACT 2601 Australia
^c CSIRO, Land and Water. GPO Box 1666, Canberra, ACT, 2601

View larger version (36K): [in this window] [in a new window]   Fig. 1. Sampling sites along the Murray and Murrumbidgee rivers.

View larger version (47K): [in this window] [in a new window]   Fig. 2. Proximate organic components (% mass) in fresh material (dark shading), abscission material (light shading), and weathered material. Data are means ±2 standard errors.

View larger version (29K): [in this window] [in a new window]   Fig. 3. Principal components of riparian plant materials based on molecular proximate components, plus total carbon, nitrogen, and phosphorus. Codes for plant materials are given in Table 1. Zla represents the superposition of plant materials Ala, Bla, and Cla. Classification of plant materials (flexible unweighted pair-group method using arithmetic averages [UPGMA], ß = –0.1) shows the grouping of leaf litter compositions. Visually recognizable plant material circled in the ordination ([1] Eucalyptus leaf; [2] Eucalyptus bark and C. cunninghamiana seed cone; [3] Grasses; [4] Macrophytes; [5] Aquatic herbs; [6] Non-eucalypt leaves), are symbolized in the classification. TN, total nitrogen; TP, total phosphorus.

View larger version (32K): [in this window] [in a new window]   Fig. 4. (a–f) Isotopic ratios of 13C and 15N in riparian plant materials.

View larger version (32K): [in this window] [in a new window]   Fig. 5. Aerobic mineralization of plant materials, represented as cumulative biological oxygen demand (BOD) (M O2 consumed per M C in the original biomass) over time (d). Average measurement errors (standard error) were 0.005 to 0.015 mole/mole O2.C–1 for most plant materials, 0.025 mole/mole O2.C–1 for Typha sp., and 0.033 mole/mole O2.C–1 for Lolium sp.

View larger version (39K): [in this window] [in a new window]   Fig. 6. Aerobic mineralization of plant material: (a, d) Rate constants (k1 and k2), fractions of (b) reactive carbon (C1) and (e) refractory carbon (C2), and the reactive product (C.k) that represents the biodegradable carbon fractions during the (c) first and (f) second decay stages of decay.

View larger version (27K): [in this window] [in a new window]   Fig. 7. (a–d) Ratios of C/N relative to 13C in plant materials.

View larger version (18K): [in this window] [in a new window]   Fig. 8. (a, b) Total N and P in plant material. Means ± maximum and minimum values.