摘要
为探讨雪灾对木质藤本幼苗更新的影响,研究了雪灾前后,云南哀牢山中山湿性常绿阔叶林木质藤本幼苗的组成、物种多样性与多度的变化、多度与冠层光照指数的关系。雪灾前(2014年)后(2016年)分别在林内设置20个4 m×4 m的样方,调查样方内木质藤本幼苗(高度或长度≤50 cm)的种类、数量、基径,并测定冠层光照指数。结果表明:①雪灾前后的木质藤本幼苗分别为502株(17种)、1022株(25种);木质藤本幼苗在雪灾前(2014年)的优势种为耐荫种,雪灾后(2016年)的优势种除了葡萄酸藤子外均为喜光的物种;②木质藤本幼苗在雪灾后(2016年)的多度、物种丰富度显著高于雪灾前(2014年)。在11种最常见木质藤本幼苗物种中,雪灾后(2016年)5个喜光种的多度显著高于雪灾前(2014年),而其他6个耐荫种的差异性不显著;③雪灾前后的冠层光照指数从1.58增加到2.88(t=-5.394,p<0.05),木质藤本幼苗的多度与冠层光照指数呈显著正相关(r=0.956,p<0.01)。
To explore the impact of snow damage on seedling regeneration of lianas,liana seedlings’composition,species diversity and abundance as well as the relationship between abundance and crown illumination index were studied in the mid-montane moist evergreen broadleaved forests of the Ailao Mountainin Yunnan Province before and after a snow damage.Twenty sample plots of 4 m×4 m were respectively established in the forest,before and after the snow damage(i.e.,in 2014 and 2016).The species,abundance and basal diameter were investigated for all liana seedlings≤50 cm in height or length,and the crown illumination index was measured for each sample plots.The results are as follows:(1)a total of 502(17 species)and 1022(25 species)liana seedlings were respectively recorded in 2014 and 2016.The dominant species in terms of the importance values of liana seedlings were shadetolerant in 2014,and light-demanding in 2016,except for Embelia procumbens.(2)The abundance and species richness of liana seedlings were significantly higher in 2016 than in 2014.Among the 11 most common species,the abundance of the five light-demanding species was significantly higher in 2016 than in 2014,while there was no significant difference in the other six shade-tolerant species.(3)The canopy illumination index increased from 1.58±0.37 in 2014 to 2.88±1.01 in 2016(t=-5.394,p=0.011);There is a significant positive correlation between the abundance of liana seedlings and the canopy illumination index(r=0.956,p<0.01).
作者
袁春明
杨国平
Yuan Chunming;Yang Guoping(Yunnan Academy of Forestry and Grassland,Kunming 650204,P.R.China;Xishuangbanna Tropical Botanical Garden,Chinese Academy of Sciences)
出处
《东北林业大学学报》
CAS
CSCD
北大核心
2023年第12期15-18,共4页
Journal of Northeast Forestry University
基金
国家自然科学基金项目(31760176、31160136)。
关键词
气候变化
雪灾
木质藤本
幼苗更新
亚热带湿性常绿阔叶林
Climate change
Snow damage
Lianas
Seedling regeneration
Subtropical moist evergreen broadleaved forest
