Growth analysis on the competition-density effect in Cunninghamia lanceolata stands

Abstract

Abstract: The competition density (C D) effect in Cunninghamia lanceolata stands was analyzed by using the reciprocal equation 1/ w=Aρ+B, where w and ρ represent mean stem volume and density,respectively,the C D curve given by the reciprocal equation on logarithmic coordinates shifted upward with time.With the increase of physical time t the biological time τ defined as the integral of λ(t) ,the growth coefficient in general logistic growth curve,tended to increase to the maximum.The coefficients A and B included in the reciprocal equation were calculated at each growth stage. With increasing τ, the coefficient A increased abruptly up to a maximum value,and then tended to decrease gradually to a constant level, whereas the coefficient B decreased exponentially,and tended to close to zero. The coefficient of growth λ(t) decreased with increasing stand age.

Key words: C-D effect, Reciprocal equation, Cunninghamia lanceolata

CLC Number:

S718.54

XUE Li, HAGIHARA Akio . Growth analysis on the competition-density effect in Cunninghamia lanceolata stands[J]. Chinese Journal of Applied Ecology, 2001, (2): 171-174.

References

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