[目的]研究10年生珍贵树种人工林凋落物归还动态及其持水能力.[方法]对广西观光木、香梓楠、灰木莲红椎混交林、西南桦、火力楠及黑木相思6种10年生珍贵树种人工林凋落物归还动态进行了为期1 a的定位研究,并分析了凋落物的持水特性.[结果]6种人工林凋落物归还均主要是叶子,观光木和黑木相思林归还动态呈双峰型季节变化；西南桦和香梓楠林为单峰型；灰木莲红椎混交林林为3峰型；火力楠则呈不规则型.其中最大峰值都出现在7月,1月份均出现最小值.6种林分凋落物持水率在30 min内迅速增大,0～8h,林分凋落物持水率有较明显的增长趋势,之后逐渐趋于饱和.[结论]观光木林、香梓楠林、灰木莲红椎混交林、西南桦林、火力楠及黑木相思林凋落物年归还量分别为7.17、7.78、10.42、6.04、7.59、6.78 l/(hm2·a).6种不同人工林凋落物吸水速率为观光木＞香梓楠＞灰木莲红椎混交林＞西南桦＞火力楠＞黑木相思.观光木、香梓楠、灰木莲红椎混交林、西南桦、火力楠及黑木相思林地凋落物最大持水率分别为470.10％ 、433.95％、405.86％、332.89％、304.50％及222.88％；最大持水量分别为2.53、1.92、2.21、0.77、1.23、0.46 mm.%[Objective ] Study the returned dynamics and water holding characteristics of litter of ten years old rare tree plantations. [ Method ] The dynamics and water holding characteristics of litters of six kinds of ten years old rare tree plantations as Tsoongiodendron odorum,Michelia hedyo-sperma, mixed forest of Magnoliaceae glanca and Castanopsis hystrix ,Betula alnoides, Michelia macclurei and Acacia melanoxylon in Guangxi were studied. [ Result ] The dynamics of littefall was mainly made of leaves, the monthly dynamics of total littefall of Tsoongiodendron odorum and Acacia melanoxylon showed the double-peak mode; Betula alnoides and Michelia hedyosperma showed the single-peak mode ; Michelia macclurei and mixed forest of Magnoliaceae glanca and Castanopsis hystrix showed the three-peak mode. Maximum values were appearing in July,while minimum values were in January. The water holding capacity ratio of litter in 6 types of forest increased rapidly in 30 minutes. In 0 - 8 h ,the water holding capacity ratio of litter had obvious rising tendency, after that, it reached saturation. [ Conclusion ] The order of water absorption rate of litter in the six tree species was Tsoongiodendron odorum > Michelia hedyosperma > mixed forest of Magnoliaceae glanca and Castanopsis hystrix > Betula alnoides > Michelia macclurei > Acacia melanoxylon. Maximum water holding capacity ratio of those six tree plantations were 470.10% ,433.95% , 405.86% ,332.89% ,304.50% and 222. 88% ,respectively. The most proportional water holding capacity were 2.53,1.92,2.21,0.77,1.23,0.46 mm, respectively.
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