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作 者 ：杨玉盛,郭剑芬,林鹏,陈光水,何宗明,谢锦升

期 刊 ：生态学报 2004年 24卷 2期 页码：201~208

关键词：养分释放；分解；凋落叶；格氏栲；杉木；天然林；人工林；

Keywords:nutrient release, decomposition, leaf-litter, Castanopsis kawakamii, Cunninghamia lanceolata, natural forest, monoculture plantation,

摘 要 ：通过对中亚热带格氏栲天然林 (natural forest of Castanopsis kawakamii,约 15 0 a)、格氏栲和杉木人工林 (monocultureplantations of C.kawakamii and Cunninghamia lanceolata,33年生 )凋落叶分解过程中养分动态的研究表明 ,各凋落叶分解过程中 N初始浓度均发生不同程度的增加后下降 ;除格氏栲天然林中其它树种叶和杉木叶 P浓度先增加后下降外 ,其它均随分解过程而下降 ;除杉木叶外 ,其它类型凋落叶的 Ca和 Mg浓度呈上升趋势 ;凋落叶 K浓度均随分解过程不断下降。养分残留率与分解时间之间存在着指数函数关系 xt=x0 e- kt。凋落叶分解过程中各养分释放常数分别为 :N (k N) 0 .6 78～ 4 .0 88;P (k P)0 .6 2 1～ 4 .30 8;K(k K) 1.4 0 8～ 4 .4 2 1;Ca (k Ca) 0 .799～ 3.75 6 ;Mg (k Mg) 0 .837～ 3.894。除杉木叶外 ,其它凋落叶分解过程中均呈 k K>k P>k N>k Mg>k Ca的顺序变化。各林分凋落叶的年养分释放量分别为N 10.73~48.19kg/(hm2·a), P 0.61~3.70kg/(hm2·a), K 6.66~39.61kg/(hm2·a), Ca 17.90~20.91kg/(hm2·a), Mg 3.21~9.85kg/(hm2·a)。与针叶树人工林相比，天然阔叶林凋落叶分解过程中较快的养分释放量再循环，这对地力维持有重要作用。

Abstract:Nutrient dynamics of decomposing leaf litter was studied in two 33-year-old plantations, Chinese fir (Cunninghamia lanceolata, CF) and Castanopsis kawakamii (CK), and compared with that of an adjacent natural forest of Castanopsis kawakamii (NF, ~150 year old) in Sanming, Fujian, China. During the decomposition, varying degree of initial increase followed by decrease of N concentrations was observed in leaf litter, while initial increase and then decrease of P concentration was only found in leaves of other...

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