本文选择川西亚高山针叶纯林和针阔混交林作为研究对象,并于2007年7月～12月采用收集框法研究了森林凋落物量以及N、P、K养分归还量。结果表明,混交林凋落量（2 090.47 kg·hm-2）比针叶林凋落量（1 189.59kg.hm-2）高出43%,林分凋落动态和归还动态呈单峰型,其高峰都出现在10月份。混交林中阔叶对凋落量的贡献达69%。同时,阔叶的养分归还量大于针叶的养分归还量。混交林和针叶林养分归还量都表现为N﹥K﹥P,针阔混交林凋落物养分归还量大于针叶林。在川西亚高山地区针阔混交林比针叶纯林具有更强的自肥能力。%In this paper, subalpine coniferous forest and coniferous and broad-leaved mixed forest in west- ern Sichuan were taken as the research object, and studies were made of litter production and nutrient（ N, P, K） return via collected litter of two forest types from January to December in 2007. The results indica- ted that mixed forest litter production （2 090. 47 kg · hm-2） was 43 % higher than coniferous forest litter production（ 1 189.59 kg · hm-2）, and the largest litter production happened in October. The contribu- tion of broad-leaved trees in mixed forest to the litter production was up to 69%. Meanwhile ,the nutrient return of the broad leaves was higher than that of the needle ones. And amount of nutrient return of two forest types showed the order in P 〉 K 〉 N. The litter nutrient return in coniferous and broad-leaved mixed forest was higher than that in coniferous forest. Therefore stronger self-fertility ability than coniferous forest. , subalpine mixed forest in western Sichuan had a
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