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Lin K.-M.,Fujian Agriculture and forestry University | Lin K.-M.,Fujian Chinese Fir Research Center | Zhang Z.-Q.,Shangrao Normal University | Ye F.-M.,Fujian Agriculture and forestry University | And 5 more authors.
Journal of Plant Resources and Environment | Year: 2010

Using mesh nylon bag method, decomposition characteristics and change dynamics of nutrient element (N, P, K and C) content of leaf litter of Cunninghamia lanceolata (Lamb.) Hook., Phoebe bournei (Hemsl.) Yang and Schima superba Gardn. et Champ. were comparatively analyzed under C. lanceolata artificial forest during 0-360 d decomposition process. The results show that, by decomposing for 360 d, the loss rate of dry weight of leaf litter of C. lanceolata, P. bournei and S. superba is 40. 6%, 42. 0% and 51. 6%, the average decomposition rate is 0. 001 3, 0. 001 6 and 0. 002 0 d-1, and the halftime (t0.5) for leaf litter decomposition is 537, 482 and 372 d, respectively. During the whole decomposition process, P content in leaf litter of three tree species appears generally a fluctuant and slow ascending trend; K content descends sharply in the early phase and then changes gently with decomposition time prolonging. Among leaf litters of three tree species, there is an obvious difference in N content change, in which N content in C. lanceolata leaf litter appears a slow ascending trend, and that in other two tree species generally appears increasing firstly and then decreasing with decomposition time prolonging. C content in leaf litters of three tree species basically shows an increasing trend in the early phase, a decreasing trend in the middle phase and a slight increasing trend in the later phase, and C/N ratio increases slightly in the early phase and decreases gradually in the later phase. The release rates and dynamic changes of nutrient elements (N, P, K and C) in leaf litters exist some differences among three tree species during decomposition process. In leaf litters of three tree species, the K release rate is higher with a similar change trend and a net release. The release rate of N, P and C in C. lanceolata leaf litter is generally lower than that of other two tree species. The leaf litter of S. superba exhibits a monotonously net release of N, P and C, but N, P and C in C. lanceolata leaf litter and P, C in P. bournei leaf litter are in slightly net enrichment in the early stage of decomposition, and then, N and C are generally in net release and P is in a wavy net release. It means that the decomposition of leaf litters of broad-leaved tree species (P. bournei and S. superba) is easier than that of coniferous tree species (C. lanceolata), and also the nutrient elements release more easily in the formers than in the latter under C. lanceolata artificial forest.

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