| 红河干热河谷木棉种群的天然更新 |
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| 引用本文： | 赵高卷,徐兴良,马焕成,黄冬,杨建军,舒媛媛,葛娈,平盼.红河干热河谷木棉种群的天然更新[J].生态学报,2016,36(5):1342-1351. |
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| 作者姓名： | 赵高卷 徐兴良 马焕成 黄冬 杨建军 舒媛媛 葛娈 平盼 |
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| 作者单位： | 西南林业大学国家林业局西南地区生物多样性保育重点实验室, 昆明 650224,中国科学院地理科学和资源研究所, 北京 100101,西南林业大学国家林业局西南地区生物多样性保育重点实验室, 昆明 650224,西南林业大学国家林业局西南地区生物多样性保育重点实验室, 昆明 650224,西南林业大学国家林业局西南地区生物多样性保育重点实验室, 昆明 650224,西南林业大学国家林业局西南地区生物多样性保育重点实验室, 昆明 650224,西南林业大学国家林业局西南地区生物多样性保育重点实验室, 昆明 650224,西南林业大学国家林业局西南地区生物多样性保育重点实验室, 昆明 650224 |
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| 基金项目： | 国家自然科学基金(31260175); 云南省高校科技创新团队建设项目 |
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| 摘 要： | 在以干热为显著特点的干热河谷,木棉成年树生长、开花良好。但其实生苗天然更新不良,其发生过程和影响因子至今尚不明确。通过对红河干热河谷木棉种群种子扩散特点、萌发策略和影响因素研究,在分析木棉实生天然更新困难影响因子的同时,对更新幼苗的发生进行了探讨。结果表明:单株木棉成年母树平均生产果实(358±46)个,单果和单株种子数分别为(274±45)粒和(98092±2540)粒,木棉种质资源丰富。种子的扩散范围广,而田间种子损失量大(损失比例为霉变54.0%、动物取食18.2%和搬运12.0%)。自然条件下种子活力在落种后10—35 d,种子含水量为2.1%—5.9%时为最佳,落种45 d后活力显著下降。干旱条件下木棉落种萌发成苗过程是天然更新的关键环节,其间水分因子起直接作用,连续数日20%—40%的土壤含水率能促进幼苗更新。适度覆土(1—2 cm)可起到改善落种的水分环境的作用,从而促进萌发。旱季降雨少,干旱持续时间长是阻碍更新幼苗向幼树转化的瓶颈。可见,地表种子存留量低、土壤含水量低、种子自然活力保存时间短、自然和人为干扰等环节限制了木棉种群成功的实生天然更新。
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| 关 键 词： | 木棉 天然更新 干热河谷 种子萌发 环境因子 |
| 收稿时间： | 2014/7/16 0:00:00 |
| 修稿时间： | 2015/12/12 0:00:00 |
Causes of difficulties with natural regeneration of a Bombax ceiba population in Hong-He dry-hot valleys (DHV) |
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| ZHAO Gaojuan,XU Xingliang,MA Huancheng,HUANG Dong,YANG Jianjun,SHU Yuanyuan,GE Luan and PING Pan.Causes of difficulties with natural regeneration of a Bombax ceiba population in Hong-He dry-hot valleys (DHV)[J].Acta Ecologica Sinica,2016,36(5):1342-1351. |
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| Authors: | ZHAO Gaojuan XU Xingliang MA Huancheng HUANG Dong YANG Jianjun SHU Yuanyuan GE Luan and PING Pan |
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| Institution: | Key Laboratory of State Forestry Administration for Biodiversity Conservation in Southwest China, Southwest Forestry University, Kunming 650224, China,Institute of Geographic Science and Natural Resource Research Chinese Academy of Sciences (CAS), Beijing 100101, China,Key Laboratory of State Forestry Administration for Biodiversity Conservation in Southwest China, Southwest Forestry University, Kunming 650224, China,Key Laboratory of State Forestry Administration for Biodiversity Conservation in Southwest China, Southwest Forestry University, Kunming 650224, China,Key Laboratory of State Forestry Administration for Biodiversity Conservation in Southwest China, Southwest Forestry University, Kunming 650224, China,Key Laboratory of State Forestry Administration for Biodiversity Conservation in Southwest China, Southwest Forestry University, Kunming 650224, China,Key Laboratory of State Forestry Administration for Biodiversity Conservation in Southwest China, Southwest Forestry University, Kunming 650224, China and Key Laboratory of State Forestry Administration for Biodiversity Conservation in Southwest China, Southwest Forestry University, Kunming 650224, China |
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| Abstract: | |
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| Keywords: | Bombax ceiba natural regeneration dry-hot valleys (DHV) seed germination environmental factors |
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