|
|||||
|
|
| 持久性土壤种子库种子萌发的个体竞争能力会衰减吗?——以紫茎泽兰为例 | |
| 引用本文： | 沈有信,赵春燕.持久性土壤种子库种子萌发的个体竞争能力会衰减吗?——以紫茎泽兰为例[J].植物生态学报,2012,36(8):754-762. |
| 作者姓名： | 沈有信 赵春燕 |
| 作者单位： | 中国科学院西双版纳热带植物园, 云南勐腊 666303 海口市环境科学研究院, 海口 570206 |
| 基金项目： | 中国科学院西部之光项目资助 |
| 摘 要： | 持久性土壤种子库(PSSB)是一种重要的植物生活史对策, 很多学者就这种对策对物种适应和进化的影响进行过推理。但种子在土壤中的长时间存留是一种风险行为, 所有的PSSB影响的推理都取决于一个假设, 即PSSB种子萌发的个体的竞争能力没有因为存留损耗而显著降低。为验证这一假设, 该文以紫茎泽兰(Eupatorium adenophorum)为研究材料, 比较了埋藏1年和3年的PSSB种子萌发的个体与同母体的当年新种子萌发的个体之间在无竞争和4种密度制约竞争条件下的株高和生物量的差异。结果显示, 无论株高还是生物量, PSSB种子萌发的个体较同母体的新种子萌发的个体均有所降低, 但在多数检测时间内的降低程度未达到显著水平, 表明紫茎泽兰PSSB种子萌发的个体相对于同母体的新种子萌发的个体的竞争能力无显著下降。 |
| 关 键 词： | 生物量 密度制约 持久性能力 种子储藏 活力耗损 |
| 收稿时间： | 2011-11-18 |
Will competitiveness of resulting plants of persistent soil seed bank decline? Example from Eupatorium adenophorum |
|
| SHEN You-Xin , ZHAO Chun-Yan.Will competitiveness of resulting plants of persistent soil seed bank decline? Example from Eupatorium adenophorum[J].Acta Phytoecologica Sinica,2012,36(8):754-762. | |
| Authors: | SHEN You-Xin ZHAO Chun-Yan |
| Affiliation: | Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla, Yunnan 666303, China Haikou Research Academy of Environmental Sciences, Haikou 570206, China |
| Abstract: | Aims It has been assumed that plants grown from persistent soil seed bank (PSSB) are not less competitive because of soil storage. Our objective was to determine whether the competitiveness of plants of PSSB will decrease. Methods We compared heights and biomass of Eupatorium adenophorum plants grown from fresh seeds and grown from one-year-old buried PSSB seeds with no competition (control) and competition with density of 0.25, 1, 4 and 8 plants·cm–2. We also compared plants grown from fresh seeds and three-year-old buried PSSB seeds with no competition (control) and competition with density of 0.10, 0.17, 0.60 and 2.17 plants·cm–2. The PSSB seeds and fresh seeds were germinated simultaneously, and seedlings were grown in garden pots up to 175 days. Plant height was measured every 15 days and biomass was measured every 30 days (3 replicates). Important findings The height and biomass of plants of one- and three-year-old buried PSSB seeds were lower than for plants germinated from fresh seeds in the control (no competition) and with competition at most measuring times. However, most differences were not statistically significant. |
| Keywords: | biomass density-dependence persistence seed storage vigor reduction |
| 本文献已被 CNKI 万方数据 等数据库收录！ | |
| 点击此处可从《植物生态学报》浏览原始摘要信息 | |
| 点击此处可从《植物生态学报》下载免费的PDF全文 | |
