摘要
茂兰喀斯特森林中华蚊母树群落 90 0 m2样地内共有种子植物 5 9种 ,其中 19种主要植物已繁殖产生种子。群落每年以种子雨形式向种子库输入种子 35 1.1粒· m- 2 ,其中对群落更新有用的成熟有效种子 15 0 .8粒·m- 2 。土壤种子库中活力种子丰富 ,共有 41种 2 5 10 .5～ 2 6 46 .8粒· m- 2 。种子库中活力种子的种类和数量均随时间的变化而变化 ,不同时间种子库的差异主要在于现存植物活力种子的变化。土壤种子库每年输出活力种子 171.9粒· m- 2 ,其中萌发输出 2 1.9粒· m- 2 ,动物采食输出 133.5粒· m- 2 ,病菌危害引起的输出为 3.2粒· m- 2 ,种子自然衰老引起的输出为 13.3粒· m- 2 。每年输出超过输入 2 1.1粒· m- 2 。演替前期植物种子没有输入 ,只有缓慢输出 ,但没有萌发输出。
species of spermatophyte were found in a 900m 2 sample plot of Distylium chinensis community in Maolan karst forest. Among the species, 19 critical species have being reproduced. Reproducing species input an average of 351.1 seeds·m -2 to the soil seed bank every year in seed rain. The number of viable seeds capable of contributing to community regeneration was 150.8 seeds·m -2 . Viable seeds of 41 species seeds were found, numbering 2510 5~2646 8 grains·m -2 in the soil seed bank. The kind and number of viable seeds in the seed bank changes with time, in a pattern that largely reflects the recent input of seed from (successionally changing) extant species. The loss of viable seeds from the soil seed bank was 171.9 grains·m -2 every year: these losses included 21.9 grains·m -2 to germination, 133.5 to predation, 3.2 to rot and 13.3 grains·m -2 to decrepitude. This loss of seeds is 21.1 grains·m -2 in excess of the annual seed rain input. At the successional stage sampled the early seral species no longer contribute to the seed rain but do add to the losses from the seed bank, though none of this loss is via germination.
出处
《植物生态学报》
CAS
CSCD
北大核心
2000年第3期366-374,共9页
Chinese Journal of Plant Ecology
基金
贵州省自然科学基金!( 93 -3 0 42 )
贵州大学基金资助项目
关键词
土壤种子库
活力种子
喀斯特森林
植物群落
Karst, Seed bank, Viable seed, Extant species, Seral earlier species
