[Seed rain, soil seed bank, and natural regeneration of natural Toona ciliata var. pubescens forest].
[Seed rain, soil seed bank, and natural regeneration of natural Toona ciliata var. pubescens forest].
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发表时间：
2012-04
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通讯作者：
Hong-Lan Huang;Lu Zhang;Cheng-Kai Liao
中科院分区：
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作者：
Hong-Lan Huang;Lu Zhang;Cheng-Kai Liao
以天然红椿为试材。以江西九江山国家级自然保护区的毛竹林为研究对象，对2008 - 2011年的种子雨、土壤种子库、幼苗数量等进行了调查。森林种子雨从10月下旬到12月底分散。2010年不同样地种子雨强度大小顺序为下公塘观测站（320.3 +/-23.5种子x m（-2））>夏公塘保护站（284.7 +/-24.2种子x m（-2））>大丘田保护站（251.6 ± 24.7粒× m~（-2）），土壤中供种子萌发和再生的完整种子数分别为222.0，34.3，34.3，34.7，34.7，34.7，34.7，34.7，34.7，34.7，34.7，34.7，34.7，34.7，34.7，34.7，34.7，34.7，34.7，34.7，34.7，34.7，34.7，34.7，34.7，34.7，34.7，34.7，34.7，34.7，34.7，34.7，34.7，34.7，34.7，34.7，34.7，34.7，34.7，34.7，34.7，34.7，4.7，3和22.6种子× m（-2）。种子库储量受种子生产量、鸟类取食、种子生活力等因素的影响，其中，鸟类取食是种子库储量大幅下降的主要原因。由于种子耐贮性差，在贮藏过程中大量腐烂，土壤中的种子很难有效贮藏超过一个月。12月萌发的幼苗平均不到2株× m（-2），次年1月土壤种子储量最少（6.7-11.8粒× m（-2）），萌发幼苗平均为0.4-0.6株× m（-2），这与森林中天然幼苗稀少的分布相一致。种子雨储量少、土壤种子库种子活力低、成苗率低是影响红豆杉天然更新的重要因素。纤毛变种毛
Taking the natural Toona ciliata var. pubescens forest in the Jiujiangshan National Nature Reserve in Jiangxi Province of China as test object, an investigation was conducted on the seed rain, soil seed bank, and seedlings number in 2008-2011. The seed rain of the forest was dispersed from late October to the end of December. In 2010, the seed rain intensity in different sampling plots was in the order of Xiagongtang observatory (320.3 +/- 23.5 seeds x m(-2)) > Xiagongtang protection station (284.7 +/- 24.2 seeds x m(-2)) > Daqiutian protection station (251.6 +/- 24.7 seeds x m(-2)), and the quantity of the intact seeds in soil supplied for seed germination and regeneration was 222.0, 34.3, and 22.6 seeds x m(-2), respectively. The seed bank reserves was affected by the seed production amount, bird feeding, and seed viability, etc., of which, bird feeding was the prime factor for the substantial drop of the seed bank reserves. Due to the low resistance against storage and a large number of rot during storage, the seeds in soil could hardly be effectively stored beyond one month. The seedlings germinated in December were averagely less than 2 stands x m(-2), and the soil seed reserves in the next January was the least (6.7-11.8 seeds x m(-2)), with the germinated seedlings averagely 0.4-0.6 stands x m(-2), which was consistent with the rare distribution of natural seedlings in the forest. It was concluded that the small seed rain reserves, low seed vigor of soil seed bank, and low seedling establishment were the important factors impacting the natural regeneration of T. ciliata var. pubescens.