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Position: Home > Articles > Study on Soil Seed Bank of Dacrydium pierrei Natural Regeneration in Bawangling,Hainan,China Forest Research 2018 (2) 83-91

海南霸王岭陆均松天然更新土壤种子库研究

作  者：
吴春燕;许洋瑜;陈永富;陈巧;洪小江;韩文涛;李晓成
关键词：
陆均松;土壤种子库;森林更新;种子寿命;霸王岭
摘  要：
[目的]了解自然条件下陆均松(Dacrydium pierrei Hickel)土壤种子库的组成和时空动态,揭示其天然林更新机制。[方法]从2014年4月开始,对海南霸王岭陆均松土壤种子库种子数量、成分类型、时空动态进行为期3年的观测,用地统计学等方法分析其与环境因子的关系。[结果](1)陆均松土壤种子库中完好种子、霉烂种子、空心种子、缺损种子占种子库种子总数的比例分别为0.48%、45.55%、29.68%、24.30%;(2)距母树不同距离所含种子数量与距离呈反"J"形曲线递减关系;(3)土壤种子库种子具有明显的空间格局;(4)种子数量垂直分布特征为:枯落物层(87.78%)>0~5 cm层(11.01%)>6~10 cm层(1.20%),0~5 cm土壤层种子分布急剧减少,至6~10 cm层几乎没有种子分布;(5)土壤种子库无活力种子的数量和比例都较高,最高的100%,有活力种子数量少且萌发率低(14%),种子寿命不到1 a。[结论]土壤种子库的上述特征表明:陆均松具有极大的天然更新障碍,陆均松土壤种子库完好种子数量少,种子质量差、萌发能力弱、寿命较短,种子大量集中在枯落物层,无法与土壤有足够的接触从而降低萌发率。
译  名：
Study on Soil Seed Bank of Dacrydium pierrei Natural Regeneration in Bawangling,Hainan,China
作  者：
WU Chun-yan;XU Yang-yu;CHEN Yong-fu;CHEN Qiao;HONG Xiao-jiang;HAN Wen-tao;LI Xiao-cheng;Research Institute of Forest Resource Information Techniques,Chinese Academy of Forestry;Hainan Bawangling National Nature Reserve;
关键词：
Dacrydium pierrei;;soil seed bank;;forest regeneration;;seed longevity;;Bawangling
摘  要：
[Objective]Understanding the composition,temporal and spatial dynamics of soil seed bank under natural conditions is important for revealing the mechanism of natural forest regeneration. [Method]The seed amount,type,temporal and spatial dynamics of soil seed bank of Dacrydium pierrei in Bawangling,Hainan were observed for3 years by geostatistics and other methods. The relationship between seed amount,type,temporal and spatial dynamics and environmental factors was analyzed. [Result](1) The proportions of sound seeds,mildewy seeds,hollow seeds,defective seeds in the soil seed bank of Dacrydium pierrei were 0. 48%,45. 55%,29. 68%,and24. 30% respectively.(2) The amount of seed followed a reversed ‘J'shape curve decreasing relationship with the distance from mother trees.(3) The seed of soil seed bank has obvious spatial pattern.(4) The pattern of vertical distribution of seed amount was litter layer(87. 78%) > 0-5 cm layer(11. 01%) > 6-10 cm layer(1. 2%),the distribution amount showed a sharp decrease in 0-5 cm layer,there was almost no seed to be distributed to the6-10 cm layer.(5) The amount and ratio of non-viable seeds was higher,reaching up to 100%,the amount of vi-able seeds was small,the germination rate was as low as 14%,and the seeds lifespan of D. pierrei in the seed bank is less than one year. [Conclusion]The characteristics of soil seed banks show it is very difficult for D. pierrei to complete natural regeneration.

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