| 高黎贡山南段长蕊木兰天然更新研究 |
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| 引用本文： | 李贵祥,柴勇,和丽萍,赵欣凤,毕波,马赛宇,陈建洪.高黎贡山南段长蕊木兰天然更新研究[J].浙江农林大学学报,2021,38(1):219-224. |
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| 作者姓名： | 李贵祥 柴勇 和丽萍 赵欣凤 毕波 马赛宇 陈建洪 |
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| 作者单位： | 云南省林业和草原科学院，云南 昆明 650201 |
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| 基金项目： | 国家林业公益性行业科研专项(201304306)。 |
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| 摘 要： | 目的 长蕊木兰Alcimandra cathcartii为国家Ⅰ级保护植物。探究长蕊木兰天然更新的状况，更好地对长蕊木兰进行保护。 方法 通过设置样圆对长蕊木兰天然更新情况进行调查，研究长蕊木兰空间格局和更新。 结果 ①长蕊木兰种群内分布型的指标方差(S2)和平均数的比率(m)为4.14，显著大于1.00，表明长蕊木兰种群个体分布不均匀，在调查样圆内幼树的分布是集群型的。②长蕊木兰在8个样圆内的更新数量为67株，更新数量较少。从所更新的长蕊木兰幼苗径级分布来看，幼苗幼树、小树和中树更新比例分别为46.27%、32.83%和20.90%，其更新数量呈金字塔结构，说明长蕊木兰更新数量虽少，但结构相对较为稳定。③长蕊木兰在0°~90°、90°~180°、180°~270°和270°~360°方位角更新株数比例分别为26.86%、19.40%、20.90%和32.84%。各个角度范围内的更新株数有一定差异，但从不同方位角分布株数方差分析来看，在不同方位角上长蕊木兰更新分布株数差异不显著。④长蕊木兰的更新与母树距离具有一定的关系，在0~5、5~10、10~15、15~20、20~25、25~30 m距离范围内，所占的株数比例分别为11.94%、34.33%、23.88%、22.39%、5.97%、1.49%，其更新主要分布在距离母树5~20 m的范围，更新株数比例达80.60%。从离长蕊木兰母树不同距离范围的更新株数方差分析来看，离母树的不同距离范围与长蕊木兰更新分布株数差异显著。 结论 长蕊木兰更新数量较少，范围较窄，种群难以扩大，其种群扩大需要人工促进更新或人工更新。表7参17
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| 关 键 词： | 森林生态学 高黎贡山 长蕊木兰 空间格局 天然更新 |
| 收稿时间： | 2020-04-09 |
Natural regeneration of Alcimandra cathcartii in south section of Gaoligong Mountain |
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| LI Guixiang,CHAI Yong,HE Liping,ZHAO Xinfeng,BI Bo,MA Saiyu,CHEN Jianhong.Natural regeneration of Alcimandra cathcartii in south section of Gaoligong Mountain[J].Journal of Zhejiang A&F University,2021,38(1):219-224. |
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| Authors: | LI Guixiang CHAI Yong HE Liping ZHAO Xinfeng BI Bo MA Saiyu CHEN Jianhong |
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| Affiliation: | Yunnan Academy of Forestry and Grassland, Kunming 650201, Yunnan, China |
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| Abstract: | Objective This study aims to explore the natural regeneration status of Alcimandra cathcartii, a National GradeⅠProtection plant, in order to better protect this species. Method By setting sample circles to investigate the natural regeneration of A. cathcartii, the spatial pattern and regeneration of this species were studied. Result (1) The ratio of index variance (S2) to mean of the distribution pattern (m) was 4.14, which was significantly greater than “1.00”, indicating that the distribution of individuals was uneven, and the distribution of saplings in the survey circle was cluster type. (2) 67 regenerated plants were recorded in 8 sampling circles. According to the diameter class distribution of the seedlings, the regeneration proportion of young, small and medium trees was 46.27%, 32.83% and 20.90%, respectively. The regeneration number showed a pyramid structure, indicating that the structure was relatively stable although the regeneration number was small. (3) The proportion of regenerated plants at 0°?90°, 90°?180°, 180°?270° and 270°?360° was 26.86%, 19.40%, 20.90% and 32.84%, respectively. There were some differences in the number of regenerated plants in each angle range, but the variance analysis of the number of trees showed there was no significant difference in the number of regenerated plants in different azimuth angles. (4) The regeneration of A. cathcartii was correlated with the distance between mother trees. Within the distance of 0?5, 5?10, 10?15, 15?20, 20?25 and 25?30 m from mother trees, the proportion of regenerated plants was 11.94%, 34.33%, 23.88%, 22.39%, 5.97% and 1.49% respectively. The regeneration was mainly distributed in the range of 5?20 m from the mother tree, accounting for 80.60% of the total number of regenerated plants. The variance analysis showed there were significant differences between the distance from the mother tree and the regeneration distribution of A. cathcartii. Conclusion The regeneration number of A. cathcarti is small and the distribution scope is narrow, so it is difficult to expand the population. Artificial promotion is suggested for its population generation and expansion. Ch, 7 tab. 17 ref.] |
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| Keywords: | forest ecology Gaoligong Mountain Alcimandra cathcartii spatial pattern natural regeneration |
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