贵州茂兰喀斯特山地顶部森林群落种子库研究

The Seed Bank of the Forest Community at the Pinnacles of Maolan Karst Hilly Area in Guizhou

在茂兰喀斯特森林山顶地段设置固定样地,定期观察植物的开花结实、种子雨、种子库的结构、组成及其萌发。结果表明:900m2样地内共有种子植物36种,其中21种已进入繁殖阶段,每年产生成熟种子520.9粒·m-2。种子雨量大,每年达910.3粒·m-2,其中对群落有用的成熟有效种子314.7粒·m-2。在天然萌发开始时的种子库中,有大量现存植物的活力种子,群落更新潜力很好。在天然情况下,1月上旬到5月中旬种子库中活力种子萌发。在天然萌发季节,900m2样地内每年共萌发出18种苗(7245株),当年存活幼苗2970株,群落更新良好。裸子植物华南五针松、短叶黄杉和翠柏在喀斯特山顶地段有良好的适应性,能长期稳定存在。

At the pinnacles of Maolan Karst hilly area,there are 36 spermatophyte species in the 900 m 2 sample plot among which 21 have being reproductived and produce ripe seeds by 520.9 seeds per square meter annually. The seed rain of the community is 910.3 seeds per square meter.The number of the germinative seeds in the seed rain which enable the community to regenerate is 314.7 seeds per square meter.The regenerative potential of the community is good because there are lots of germinative seeds of many existed plants in the seed bank at the beginning of the germination of the seed bank. In the natural environment,the germinative seeds in the seed bank germinate from the first ten days of Jan. to the second ten days of May. In the germination season,18 kinds of the germinative seeds in the 900 m 2 sample plot germinate to form seedling with the number 7 245. And the number of the survival seedling is 2 970.The community regenerate well. The gymnospermae, Pinus kwangtungensis,Pseudotsuga brevifolia and Calocedrus macrolepis, adapt themselves well to the pinnacles of Maolan Karst hilly area,and will exist for long time.