The litter amounts and decomposition dynamics of six years ole Pinus kesiya var.langbianensis plantation in Qingshuihe of Pu' er city were studied.The results indicated that the annual litter amounts increased as the planting space became denser, the seasonal dynamics model of litter of all the studied five stands of different planting densities are all single peak type.The litter produced in March and April accounts for 68.31 ％ ～ 73.51 ％ of the total amount of the whole year.The nutrient returns from litter are closely related with the amount of litter, the nutrient return of total nitrogen and total magnesium were respectively the highest and the lowest.The return amount order of five macro-elements is N＞P＞Ca＞K＞ Mg.The litter decomposition speed in dry season is slow, while the decomposition speed in wet season is fast, the decomposition course within a year showed the regular of first-slow-then-quick , the decomposition dynamics is basic anastomotic with temperature and rainfall of the study area.%经对普洱市清水河5种不同密度6年生思茅松人工林的凋落物量及分解动态进行研究,结果表明:思茅松人工林年凋落物量随密度增大而递增;5种思茅松人工林月凋落规律相似,呈单峰型变化,在全年间,3～4月的凋落物量占全年的68.31%～73.51%,其余各月比较低;思茅松人工林凋落物归还养分的多少与凋落物量密切相关,人工林全N的归还量最高,全Mg的归还量最低,5种大量元素归还量的顺序为:N＞P＞Ca＞K＞Mg;思茅松人工林凋落物分解分两个阶段,旱季凋落物分解速度相对较慢,雨季凋落物快速分解,整个分解阶段呈现"由慢到快"的规律,年分解率受当地气温和降水的影响较大.
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