武夷山主要杉木伴生树种落叶分解速率的研究

STUDIES ON LITTER DECOMPOSITION OF MAJOR CHINESE FIR ASSOCIATATED SPIECES IN WUYI MT

在武夷山天然杉木混交林群落调查的基础上，选择了与杉木相容性大、联结系数高的毛竹、木荷等６种杉木伴生树种作落叶分解达率的比较研究，结果表明，各树种落叶经过一年的分解其干物质残留率分别为：甜槠２８．４％，丝栗拷３２．９％，毛竹３３．７％，米槠３５．６％，苦槠４０．１％，木荷４４．４％。落叶的主要养分元素浓度和残留率在分解过程中均有较大的波动，有些树种氮、磷、钙、镁等元素的含量出现绝对量的增加，但碳氮比值均随时间推移逐渐减小，其减小的比率顺序反映了不同树种落叶的分解达率。

After an extensive survey of the natural Chinese fir mixed forests in the Wuyi mountains, further comparative studies have been made on the litter decomposition of six major Chinese fir associated species. The resultS showed that the dry matter remnant ratio of leaf litter of Castanopsis eyresi, Castanopsis fargesii, phyllostachys pubescens, Castanopsis carlesii, Castanopsis sclerophylla and Schima superba were 28. 4 %, 32. 9%' 35. 7%, 40. 1 % and 44. 4 % respectively after decompsoed for one year. The concentration and remnant ratio of the nutrient elements in the litter variated significantly in the processes of the decomposition. However, the ratio of carbon and nitrogen reflected the differences of the decomposition rates among those species.