格氏栲天然林与人工林枯枝落叶层和粗木质残体有机化学组成研究

对福建省三明市格氏栲天然林及在其采伐迹地上营造的33年生格氏栲人工林和杉木人工林这3种林分的枯枝落叶层及粗木质残体物质化学组成进行研究．结果表明：在分解过程中3种林分枯叶和枯枝水溶性物质和纤维素含量不断下降，而枯枝中苯醇溶性物质和粗蛋白质含量有所上升．除半纤维素和纤维素外，3种林分粗木质残体水溶性物质、木质素和粗蛋白质含量均为L层〉F层，而苯醇溶性物质含量为L层〈F层．格氏栲天然林枯叶和枯枝水溶性物质、木质素、粗蛋白质、半纤维素和纤维素总贮量最高，而苯醇溶性物质总贮量以格氏栲人工林的最高．3种林分F层枯叶和枯枝有机物质的总贮量高于L层．与2种人工林相比，格氏栲天然林粗木质残体中各种有机物质贮量均最高．

Organic Components of the Forest Floor and Coarse Woody Debris in Natural and Monoculture Plantation Forests of Castanopsis kawakamii

Concentrations and storages of organic matter in the forest floor and coarse woody debris(CWD)were studied in a natural forest of Castanopsis kawakamii(NF)and adjacent monoculture plantations of C.kawakamii(CK)and Chinese fir(Cunninghamia lanceolata,CF)in Sanming,Fujian,China.The results showed that concentrations of water soluble compounds and cellulose in leaf and twig litter of the L layer decreased during the decomposition,while increases of concentrations of alcohol soluble compounds and coarse protein were found in twig litter.Concentrations of water soluble compounds,lignin and coarse protein of CWD were higher in L layer than those in F layer.The trend was reverse for concentration of alcohol soluble compounds.Maximum storage of water soluble compounds,lignin,coarse protein,hemicellulose and cellulose were observed in leaf and twig litter of the forest floor in the NF,while the forest floor of the CK had the greatest amount of alcohol soluble compounds.The two layers could be arranged in this order with respect to storage of organic components in leaf and twig litter:F layer>L layer.Stocks of organic components in CWD were greater in the NF than the other two plantations.