Age-related relationship between annual productivity and body size of trees : testing the metabolic theory

• Autorzy: Cheng D. , Zhong Q. , Wang G.
• Języki publikacji: EN

Abstrakty

EN

Metabolic theory of ecology predicts a 3/4 power relationship between annual productivity P[T] and body size M[T] (i.e., P [is proportional to] M[^3/4]), which has important implications to estimates of carbon fluxes, ecosystem health, global carbon budgets, and a variety of other phenomena. To test this prediction, we examined a large dataset for Chinese forests. Such dataset covers six major forest biomes and a total of 17 forest types grown across a range of annual temperature (-6.6 to 25.2[degrees]C), mean annual rainfall (27 to 2989 mm), elevation (10 to 4240 m a.s.l.), and stand age (3 to 350 yrs.). Reduced major axis (RMA) regression analyses were used to compare the P[T] versus M[T] scaling exponents and normalization constants (i.e., slopes and Y-intercepts of log-log linear relationships, respectively). Comparisons were made for ten different age-sequences (stand age ranges from 20 to 200 yrs). When stand age was less than 100 yrs, relationship of P[T] versus M[T] had similar scaling exponents ([alpha][RMA]>> 1.0), while the Y-intercepts decreased systematically. When stand age exceeded 140 yrs, scaling exponents decreased ([alpha][RMA] <0.86). Both the aboveground annual productivity and aboveground body size per individual tree (P[A] and M[A], respectively) showed the same behavior. We therefore conclude that the relationship of P[T] versus M[T] systematically declined with the stand age, and was inconsistent with the predictions of metabolic theory.

Słowa kluczowe

EN

age-sequence; annual productivity; community resource use; metabolic theory of ecology

PL

metaboliczna teoria ekologii; roczna wydajność; sekwencja wieku; zbiorowisko; zużycie zasobów

• Wydawca: Museum and Institute of Zoology, Polish Academy of Sciences
• Czasopismo: Polish Journal of Ecology
• Rocznik: 2009
• Tom: Vol. 57, nr 3
• Strony: 441--449
• Opis fizyczny: Bibliogr. 34 poz.,Tab., wykr.,

Twórcy

autor

Cheng D.

autor

Zhong Q.

autor

Wang G.

• College of Geographical Sciences, Fujian Normal University, Fuzhou, Fujian Province 350007, China,

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