梵净山栲树群落的种子雨、种子库及更新  

NATURE OF SEED RAIN, THE SEED BANK AND REGENERATION OF A CASTANOPSIS FARGESII COMMUNITY ON FANJING MOUNTAIN

作　　者：刘济明[1] 钟章成[2] 

机构地区：[1]贵州大学林学系,贵阳550025 [2]西南师范大学生物系,重庆400715

出　　处：《植物生态学报》2000年第4期402-407,共6页Chinese Journal of Plant Ecology

基　　金：贵州省自然科学基金项目!( 93 -3 0 42 )

摘　　要：梵净山栲树 (Castanopsis fargesii)群落种子雨丰富 ,对群落更新发展有用的成熟有效种子 2 6 8.9粒·m- 2 。优势种及其它主要种类均有种子产生 ,为维持现存群落的稳定提供了重要基础。种子库中活力种子丰富 ,其数量达 375 4.3粒· m- 2 ,分属 30种植物 ,其中木本植物种子 18种 ,草本植物种子 12种。种子库中有现存植物种子 13种 ,群落演替前期各阶段产生的种子 17种。在种子库中 ,现存群落的优势种和其它主要树种均有活力种子存在 ,群落更新潜力好。在种子库中 ,现存植物产生的种子绝大多数分布于枯枝落叶层 ,只有少部分 (3种 )可分布到土壤层 ,演替前期各阶段产生的种子全部分布在土壤层中。随土壤深度增加 ,种子的种类和物种多样性指数均逐渐减小。从枯枝落叶层向下 ,种子库与现存群落的相似性逐渐减小。在天然情况下 ,种子库中优势种及其它主要种类的种子大量萌发出苗 ,现存群落更新良好 ,稳定性强。Heavy seed rain is observed in the Castanopsis fargesii community of Fanjing Mountain, with as much as 268.9 vi able seeds per square meter. As the main species of the community all contribute to this seed rain a foundation of regeneration in the community is ensured. The seed bank itself contains a large number of germinative seeds (3754 3 per squa re meter): these seeds belong to 18 woody species and 12 herb species. These spe cies represent 13 extant species vegetatively present in the community which and 17 species of earlier, seral species. The regenerative potential of the communi ty can be described as good as all the main species of the community which have germinative seeds in the seed bank. These are distributed largely in the litter layer, seeds of only 3 extant species were emerged from soil samples. In contras t all of the germinative seeds of the earlier seral species were distributed in the soil. In the soil, the species diversity index of germinative seed declined gradually with increasing soil depth. The similarity between the seed bank and t he present community similarly declined gradually from the litter layer down wit h depth into the soil. Under natural conditions, many germinative seeds of the m ain species of the present community in the seed bank germinate to contribute to the recruitment of seedlings. It is concluded that the present community regene rates well and is stable.

关 键 词：种子雨 种子库 更新 栲树 群落 天然萌发 

分 类 号：S792.170.4[农业科学—林木遗传育种]