| 尕海湿地不同密度条件下垂穗披碱草根系分形结构 |
| |
| 引用本文： | 李雪萍,赵成章,任悦,张晶,雷蕾.尕海湿地不同密度条件下垂穗披碱草根系分形结构[J].生态学报,2018,38(4):1176-1182. |
| |
| 作者姓名： | 李雪萍 赵成章 任悦 张晶 雷蕾 |
| |
| 作者单位： | 西北师范大学地理与环境科学学院甘肃省湿地资源保护与产业发展工程研究中心; |
| |
| 基金项目： | 国家自然科学基金项目（41461013，91125014）；甘肃省生态学重点学科基金项目 |
| |
| 摘 要： | 根系分形结构影响根系的分布格局,是植物根系与胁迫生境相互适应的结果。采用全根挖掘和Win-RHIZO根系分析仪相结合的方法,按照垂穗披碱草种群密度设置Ⅰ(500—700株/m~2)、Ⅱ(300—500株/m~2)、Ⅲ(100—300株/m~2)3个密度梯度,研究了尕海湿地不同密度条件下垂穗披碱草(Elymus nutans)的根系分形结构。结果表明:随着垂穗披碱草种群密度的降低,湿地群落的高度、盖度、地上生物量及根系分形维数呈逐渐减小趋势,地下生物量与分形丰度逐渐增大;垂穗披碱草根系分形维数与分形丰度在高密度(Ⅰ)样地和低密度(Ⅲ)样地均呈极显著负相关关系(P0.01),在中密度(Ⅱ)样地呈显著负相关关系(P0.05),垂穗披碱草根系分形维数和分形丰度存在着"此消彼长"的权衡关系。在高密度湿地群落垂穗披碱草倾向于密集型根系构型构建模式,在低密度湿地群落选择扩散型的根系生长模式,体现了密度制约下高寒湿地植物种群应对资源多重竞争的生态适应机制。
|
| 关 键 词： | 密度 根系构型 垂穗披碱草 分形维数 分形丰度 尕海湿地 |
| 收稿时间： | 2017/1/20 0:00:00 |
| 修稿时间： | 2017/10/28 0:00:00 |
Fractal root systems of Elymus nutans under different density conditions in Gahai Wetland |
| |
| LI Xueping,ZHAO Chengzhang,REN Yue,ZHANG Jing and LEI Lei.Fractal root systems of Elymus nutans under different density conditions in Gahai Wetland[J].Acta Ecologica Sinica,2018,38(4):1176-1182. |
| |
| Authors: | LI Xueping ZHAO Chengzhang REN Yue ZHANG Jing and LEI Lei |
| |
| Institution: | College of Geography and Environmental Science, Northwest Normal University, Research Center of Wetland Resources Protection and Industrial Development Engineering of Gansu Province, Lanzhou 730070, China,College of Geography and Environmental Science, Northwest Normal University, Research Center of Wetland Resources Protection and Industrial Development Engineering of Gansu Province, Lanzhou 730070, China,College of Geography and Environmental Science, Northwest Normal University, Research Center of Wetland Resources Protection and Industrial Development Engineering of Gansu Province, Lanzhou 730070, China,College of Geography and Environmental Science, Northwest Normal University, Research Center of Wetland Resources Protection and Industrial Development Engineering of Gansu Province, Lanzhou 730070, China and College of Geography and Environmental Science, Northwest Normal University, Research Center of Wetland Resources Protection and Industrial Development Engineering of Gansu Province, Lanzhou 730070, China |
| |
| Abstract: | |
| |
| Keywords: | density root architecture Elymus nutans fractal dimension fractal abundance Gahai Wetland |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《生态学报》浏览原始摘要信息 |
| 点击此处可从《生态学报》下载免费的PDF全文 |
|
