文献类型：期刊文献

英文题名：The influence of vegetation structure on lift-off velocity of diaspores during secondary wind dispersal

作者：Tian, Liang[1,2] Liang, Wei[1] Liu, Zhimin[1] Liu, Minghu[3] Phartyal, Shyam S.[4] Zong, Lu[1,2] Qian, Jianqiang[5] Xin, Zhiming[3,6] Zhu, Jinlei[7] Ba, Chaoqun[1,2] Li, Xiangrong[1,2] Liu, Yuting[3] Wang, Jianjun[3] Zhai, Shanshan[1,2]

第一作者：Tian, Liang

通信作者：Liu, ZM[1]

机构：[1]Chinese Acad Sci, Inst Appl Ecol, Shenyang 110016, Peoples R China;[2]Univ Chinese Acad Sci, Beijing 100049, Peoples R China;[3]Chinese Acad Forest, Expt Ctr Desert Forestry, Dengkou 015200, Peoples R China;[4]Nalanda Univ, Sch Ecol & Environm Studies, Rajgir 803116, Bihar, India;[5]Henan Agr Univ, Zhengzhou 450046, Peoples R China;[6]Natl Forestry & Grassland Adm, Inner Mongolia Dengkou Desert Ecosyst Natl Observ, Dengkou 015200, Peoples R China;[7]Chinese Acad Forestry, Beijing 100091, Peoples R China

年份：2023

卷号：155

外文期刊名：ECOLOGICAL INDICATORS

收录：;EI(收录号：20234114854365);Scopus(收录号：2-s2.0-85173240821);WOS:【SCI-EXPANDED(收录号:WOS:001149639200001)】；

基金：We thank the Experimental Center of Desert Forestry, Chinese Academy of Forestry and the First Forestry Station for providing accommodation during the experiment. This work was supported by the National Natural Science Foundation of China (32171870, 42007427) .

语种：英文

外文关键词：Diaspore initiation; Secondary dispersal; Seed attributes; Vegetation coverage; Vegetation pattern

摘要：Lift-off velocity, the wind speed at which a diaspore starts moving during secondary wind dispersal, representing diaspore mobile capacity, may greatly depend on vegetation where dispersal takes place. However, how vegetation structure influences lift-off velocity and which is the most important vegetation attribute remain unknown. The vegetation with various attributes (four coverages-0, 10 %, 20 % and 30 %, three life-form compositions herb, shrub and herb + shrub, two vertical patterns-one and two layers, and two horizontal patterns-uniform and aggregated) were set up for the wind tunnel experiment. Diaspores of 30 species varied in wing loading, terminal velocity, mass, projected area, length, width, height, and shape index were selected to measure their lift-off velocity within various vegetation structures. Lift-off velocity significantly increased with the increasing vegetation coverage, in the case of any life-form composition, vertical pattern and horizontal pattern of vegetation. For the vertical pattern of vegetation, the lift-off velocity in one-layer vegetation was significantly higher than that in two-layer vegetation, but only for 10 % vegetation coverage. Both the life-form composition and the horizontal pattern of vegetation had no influences on lift-off velocity. The correlation between lift-off velocity and diaspore attributes (length, width, height, projected area, mass and wing loading) increased with vegetation coverage and the correlation in two-layer vegetation was larger than that in one-layer vegetation. Our results indicate that vegetation coverage is the key vegetation attribute determining lift-off velocity during secondary wind dispersal. Lift-off velocity is also influenced by diaspore traits, but their relationships tend to be regulated by vegetation attributes, especially the coverage and vertical pattern of vegetation. Our study demonstrates the important role of vegetation coverage in determining the second dispersal capacity, which is helpful to understand the dispersal strategies of plants in response to vegetation structure and succession.