Elevated temperature and CO2 interactively modulate sexual competition and ecophysiological responses of dioecious Populus cathayana

编号 010026602

推送时间 20201123

研究领域 森林生态 

年份 2020 

类型 期刊 

语种 英语

标题 Elevated temperature and CO2 interactively modulate sexual competition and ecophysiological responses of dioecious Populus cathayana

来源期刊 Forest Ecology and Management

期 第266期

发表时间 20210201

关键词 Nitrogen use efficiency;  Sexual competition;  Climate change;  Non-structural carbohydrates;  Structural carbohydrates;  Photosynthetic capacity; 

摘要 It remains unclear how global climate change affects dioecious plants that may be especially vulnerable to climate drivers, because they often exhibit skewed sex ratios and eco-physiological specialization in certain microhabitats. In this study, female and male saplings of Populus cathayana were employed to explore sex-specific responses and the effects of sexual competition under elevated temperature (ET), elevated CO2 (EC) and combination of elevated temperature and CO2 (ETC). The results demonstrated that elevated temperature and CO2 interactively modulated sexual competition and responses of P. cathayana. Moreover, competition patterns affected the eco-physiological responses of P. cathayana to climate change treatments. Under both intra- and inter-sexual competition, biomass components, photosynthetic parameters and carbon-related metabolites of females were most strongly affected by ET, while males exhibited a higher photosynthesis and resource use efficiency, and a better biomass accumulation and carbon balance mechanism when compared to females when experiencing intra-sexual competition under EC. The competitive pressure of females on males in inter-sexual competition was intensified by ET, while it was alleviated by ETC. We conclude that climate change drivers and competition patterns differently regulate the sex-specific responses and competitive intensity of males and females, which may have a crucial effect on sex ratios, spatial sexual segregation, biomass production and carbon sequestration in dioecious species in the future.

服务人员 王璐

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