By Hormoz Bassirirad

ISBN-10: 3540241868

ISBN-13: 9783540241867

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1989) and Aber et al. (1990) observed a two-phase decay sequence; during the first phase (up to about 80 % mass loss), fractional mass loss was relatively constant, whereas during the second phase mass loss was imperceptible. They concluded that use of the exponential decay model would greatly overestimate the rate of decay of phase-2 material (humus or soil organic matter). Berg (1991) suggested that there is a maximum decomposition limit, beyond which the rate of decay is immeasurably slow. This explains the deep accumulations of undecomposed litter in undisturbed, nutrient-poor pine forests on northern islands (Wardle et al.

1999) found negligible microbial biomass at low (20 %) moisture compared with higher moisture levels, regardless of temperature. 8 °C warmer (Bottner et al. 2000). Irrigation of forests accelerated the decomposition of soil organic matter and the mineralization of C and N (Polglase et al. 1995), and stimulated N release from the forest floor (Kim and Burger 1997). The influence of moisture on the decomposition of soil organic matter appears to be greater at high temperatures (Douglas and Tedrow 1959; Zak et al.

I. A general model of the influences of abiotic variables. Soil Biol Biochem 9:33–40 Burger JA, Pritchett WL (1984) Effects of clearfelling and site preparation on nitrogen mineralization in a southern pine stand. Soil Sci Soc Am J 48:1432–1437 Burke IC (1989) Control of nitrogen mineralization in a sagebrush steppe landscape. E. Prescott Carreiro MM, Sinsabaugh RL, Repert DA, Parkhurst DF (2000) Microbial enzyme shifts explain litter decay responses to simulated nitrogen deposition. Ecology 81:2359–2365 Chadwick DR, Ineson P, Woods C, Piearce TG (1998) Decomposition of Pinus sylvestris litter in litter bags: influence of underlying native litter layer.

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Nutrient Acquisition by Plants: An Ecological Perspective (Ecological Studies, Vol. 181) by Hormoz Bassirirad

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