nter-annual Dynamics of Leaf Litter Decomposition in Control-density Larix principis-rupprechtii Plantations

Abstract

Abstract: It is of vital importance to study the density effects on leaf litter substrate quality and their roles on decomposition rate in managed Larix principis-rupprechtii plantations.In 2000,the thinning experiment was done in four different densities.Decomposition rate,nutrient dynamics and chemical components of leaf litter were explored by litter bag method during 2009 to 2011.The results showed that:(1)Mass loss rate of inter-annual dynamics were shaped like inversed “V”.Highest-density standⅠ,induced by regulated thinning,showed obviously significance between other three-densities’ stands(Ⅱ,Ⅲ and Ⅳ ).It indicates that density has specific temporal effect on litter decomposition.(2)The density effect reflected by decomposition rates was consistent with ratio of lignin content to nitrogen and mass loss rate;therefore the ratio and mass loss rate could be used as predictors of leaf litter decomposition.Additionally,ash mass could be considered as a predictor of turnover period.(3)In the whole observation of 3 years,return pattern of N and K exhibited two-recycled accumulation-release mode ;P followed balanced fluctuation- accumulation mode;Mg indicated the continuous increased mode.However,return pattern of Ca was one-recycled release-accumulation mode.The paper was aimed at offering a theoretical basis for forest thinning management.

Key words: inter-annual dynamics, litter substrate quality, pre-commercial thinning, litter decomposition model

CLC Number:

S791.22

JIANG Ping, LIU Yong. nter-annual Dynamics of Leaf Litter Decomposition in Control-density Larix principis-rupprechtii Plantations[J]. FOREST RESOURCES WANAGEMENT, 2013, 0(1): 38-44.

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