Liana Diversity and Its Relationship with Host Trees in the Yuanjiang Dry-Hot Valley, Yunnan, China
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摘要: 木质藤本是森林生态系统的重要组分。本研究在元江干热河谷地区随机设置了30个20 m×20 m的样方，调查样方中胸径≥0.5 cm的木质藤本多样性及其与宿主树木之间的关系。结果显示：30个样方中记录到胸径≥0.5 cm的木质藤本植物共945株（隶属于22种20属11科），其中，豆科木质藤本的丰富度和多度最高；胸径≤2 cm的木质藤本占个体总数的63.7%；茎缠绕类木质藤本的个体数最多。样方中胸径≥5 cm的树木共有1060株（隶属于38种31属16科），36.0%的树木上至少附藤1株。不同径级和不同树皮粗糙度的树木被木质藤本侵扰的百分比之间存在极显著差异（P<0.001）。随着宿主树木平均枝下高的增加，附藤率呈下降趋势。76.5%的木质藤本选择离其根生长点最近的树木进行攀援。表明元江干热河谷中的木质藤本以小径级占优势，树木胸径、枝下高、树皮粗糙度和木质藤本根生长点到树木的距离是影响木质藤本侵扰树木的重要因素，支持木质藤本对宿主树木的侵扰具有选择性的假说。研究结果对中国西南干热河谷退化植被的恢复与物种多样性保护具有重要意义。Abstract: Lianas constitute an important component of forest ecosystems. In this study, we investigated liana diversity and their relationship with host trees in 30 plots (20 m×20 m) set in a dry-hot savanna valley of Yuanjiang county, Yunnan Province, Southwest China. In total, 945 liana individuals with diameters at breast height (DBH) ≥0.5 cm were recorded, representing 22 species in 20 genera and 11 families. Legume lianas were the most abundant. Stem twining was the most predominant climbing mechanism. The DBH of 63.7% of liana individuals was ≤2 cm. We also recorded 1060 host trees with DBH ≥5 cm, belonging to 38 species in 31 genera and 16 families, 36.0% of which were climbed by at least one liana. There were significant differences in the percentage of trees infested by lianas among different tree size and bark roughness (P<0.001). With the increase in average branch-free bole height, the percentage of tree infestation by lianas decreased. In addition, 76.5% of lianas selected the nearest tree to climb. These results indicated that in the Yuanjiang dry-hot valley, lianas with small DBH were dominant. Tree size, branch-free bole height, bark roughness, and distance from liana rooting point to the closest host tree were the most important factors influencing host tree selection, supporting the hypothesis that lianas exhibited host preference. These findings are important for the rehabilitation of degraded ecosystems and biodiversity conservation in the dry-hot valleys of southwestern China.
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Keywords:
- Dry-hot valley /
- Host-tree /
- Lianas /
- Liana-tree interactions /
- Species diversity
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