| 湿地松种子萌发对模拟水分胁迫的响应 |
| |
| 引用本文： | 张聃,曹昀,郑林. 湿地松种子萌发对模拟水分胁迫的响应[J]. 水土保持研究, 2011, 18(1): 188-191 |
| |
| 作者姓名： | 张聃 曹昀 郑林 |
| |
| 作者单位： | 1. 江西师范大学地理与环境学院,南昌,330022
2. 江西师范大学地理与环境学院,南昌,330022;江西师范大学鄱阳湖湿地与流域研究教育部重点实验室,南昌,330022 |
| |
| 基金项目： | 国家科技支撑计划“沙化土地与水土流失区治理技术研究与示范(2007BAC23B03)” |
| |
| 摘 要： | 采用聚乙二醇(PEG-6000)高渗溶液人工模拟水分胁迫,研究湿地松(Pinus elliottii)种子对水分胁迫的生态响应。结果表明:随着水分胁迫的加重,湿地松种子的萌发率、相对萌发率、发芽势、发芽指数、幼苗高度、根长与生物量等指标均呈现不同程度的下降趋势;通过建立水分胁迫与种子萌发率的回归方程,求解得出湿地松种子萌发的耐旱临界值是-0.68MPa,耐旱极限值是-1.14MPa;水分胁迫对湿地松种子萌发初期影响较大,会延迟其萌发时间,分别为1～8d不等;幼苗的根系在轻中度水分胁迫下生长较为稳定,表现出对干旱的适应性;水势为-0.8MPa时湿地松种子进入浅度休眠状态来适应干旱环境,通过建立水势与生物量的回归方程预测在-1.07MPa下湿地松生物量降至为0。
|
| 关 键 词： | 湿地松 聚乙二醇 水分胁迫 种子萌发 |
Responses of Germination of Pinus Elliottii Seeds to Simulating Water Stress |
| |
| ZHANG Dan,CAO Yun,ZHENG Lin. Responses of Germination of Pinus Elliottii Seeds to Simulating Water Stress[J]. Research of Soil and Water Conservation, 2011, 18(1): 188-191 |
| |
| Authors: | ZHANG Dan CAO Yun ZHENG Lin |
| |
| Affiliation: | ZHANG Dan1,CAO Yun1,2,ZHENG Lin1,2(1.College of Geography and Environment,Jiangxi Normal University,Nanchang 330022,China,2.Key Laboratory of Poyang Lake Wetland and Watershed Research,Ministry of Education,China) |
| |
| Abstract: | The artificial water stress treatment was conducted with polyethylene glycol(PEG-6000) hypertonic solution,so that we can find the response of seeds of Pinus elliottii to water stress.The results indicate that: with water stress increased,P.elliottii seed germination rate,relative germination rate,germination potentiality,germination index,seedling shoot length and root length,biomass had a decreasing tendency in different degrees;By established linear regression equation of seed germination under water str... |
| |
| Keywords: | P.elliottii PEG-6000 water stress seed germination |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
|
