摘要 | 以分布于云南省宾川县鸡足山的珍稀香花植物管花木犀(Osmanthus delavayi Franch.)种群为对象,通过群落调查和土壤分析,解析土壤养分对其种群空间分布的影响。结果显示:管花木犀群落共记录维管植物78种,隶属于36科58属。管花木犀在乔木层和灌木层的重要值分别为21.41%和38.64%,占据优势地位。土壤有机质、全氮、全磷、全钾、速效氮和速效钾含量均呈现中等空间变异强度,其中全磷含量变异系数最高(35.98%)。克里格插值显示:土壤各养分含量在研究区西北部较高,并向东南方向递减。多元逐步回归分析表明:土壤速效钾含量对管花木犀个体数有极其显著负效应(p<0.001),对平均地径有极显著负效应(p<0.01);土壤有机质含量对个体数有极显著正效应。综上,在土壤养分方面,“低钾、高有机质”的土壤微生境是管花木犀种群适宜生存与更新的关键条件。
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Abstract | Taking the population of the rare fragrant plant Osmanthus delavayi Franch. distributed in Jizu Mountain, Binchuan County, Yunnan Province as the research object, the effects of soil nutrients on its population spatial distribution were analyzed through community investigation and soil analysis. The results show that a total of 78 vascular plant species are recorded in the O. delavayi community, belonging to 58 genera of 36 families. The importance values of O. delavayi in the arbor layer and shrub layer are 21.41% and 38.64% respectively, indicating its dominant position. The contents of soil organic matter, total nitrogen, total phosphorus, total potassium, available nitrogen, and available potassium all exhibit moderate spatial variation, among which total phosphorus content has the highest coefficient of variation (35.98%). The Kriging interpolation shows that soil nutrient contents are relatively high in the northwest of the study area and gradually decrease towards the southeast. The stepwise multiple regression analysis indicates that soil available potassium content has a very highly significant negative effect (p<0.001) on the individual number of O. delavayi and a highly significant negative effect (p<0.01) on the mean ground diameter; soil organic matter content has a highly significant positive effect on the individual number. In conclusion, in terms of soil nutrients, the soil microhabitat characterized by “low potassium and high organic matter” is a key condition for the suitable survival and regeneration of the O. delavayi population. |
| 关键词 | 管花木犀; 土壤养分; 空间分布; 保护 |
| Key words | Osmanthus delavayi Franch.; soil nutrient; spatial distribution; conservation |
| 作者 | 李倩, 李金凤, 王钥元, 段一凡 |
| 所在单位 | 南京林业大学 木犀属植物栽培品种国际登录中心, 江苏 南京 210037 |
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| 基金项目 | 江苏省高校优势学科建设工程项目(PAPD) |