| 郑静楠,郑进烜,王 勇,吴富勤,董 磊,郭汝平,苏贤海.滇南苏铁种群结构与分布格局研究[J].林业调查规划,2023,48(6):108-113 |
| 滇南苏铁种群结构与分布格局研究 |
| Population Structure and Distribution Pattern of Cycas diannanensis |
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| DOI： |
| 中文关键词: 滇南苏铁 种群结构 分布格局 年龄结构 存活曲线 |
| 英文关键词: Cycas diannanensis community structure distribution pattern age structure survival curve |
| 基金项目:云南省第二次重点保护野生植物资源项目（000036Z00015）. |
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| 中文摘要: |
| 滇南苏铁(Cycas diannanensis)是云南特有种，为国家一级重点保护植物。通过样方法对滇南苏铁种群及其所在群落进行调查，分析其群落结构和物种多样性，以及其种群密度、年龄结构、存活曲线、空间分布格局与森林郁闭度的关系。结果表明，森林中林下植物主要伴生种与其群落物种的组成极具相关性，恐龙河州级自然保护区森林郁闭度整体为0.6以下的次生林是滇南苏铁生长的主要生境，共分布有61科127属196种维管束植物，滇南苏铁种群密度为0.23/m2；受不同森林郁闭度以及种间关系影响，滇南苏铁种群在Ⅰ~Ⅵ龄级整体表现出种群数量逐渐减少的趋势，年龄结构呈金字塔型，其存活曲线趋近于Deevey-II型；滇南苏铁种群呈聚集分布，各指标中k值随着森林郁闭度的增加而逐渐变小，说明其种群密度受森林郁闭度影响。 |
| 英文摘要: |
| Cycas diannanensis is an endemic species in Yunnan and a national first-class key protected plant. The C.diannanensis population and its community were investigated by sampling method, and its community structure and species diversity, as well as the relationship between population density, age structure, survival curve, spatial distribution pattern and forest canopy density were analyzed. The results showed that the main associated species of understory plants in the forest were highly correlated with the composition of their community species, and the secondary forest with an overall forest canopy density of less than 0.6 in Konglonghe Nature Reserve was the main habitat for C.diannanensis, where there were 196 species of vascular plants belonging to 127 genera and 61 families, and the population density of C.diannanensis was 0.23/m2; affected by different forest canopy density and interspecific relationship, the population showed a gradual decreasing trend from Ⅰ-Ⅵ age class, the age structure was pyramid, and the survival curve was close to Deevey-II type; the C.diannanensis population was clustered, and the k value in each aggregation degree index gradually decreased with the increase of forest canopy density, indicating that its population density was affected by forest canopy density. |
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