• 论文与研究报告 •

外来树种火炬树入侵的生理生态特性——与同属本地种盐肤木的比较

1. 鲁东大学生命科学学院 烟台 264025
• 收稿日期:2016-03-21 修回日期:2017-02-06 出版日期:2017-05-25 发布日期:2017-06-22
• 通讯作者: 柏新富
• 基金资助:
国家自然科学基金青年项目（31300465）。

Eco-Physiological Characteristics of the Exotic Plant Rhus typhina in Comparison with Its Indigenous Congeners Rhus chinensis

Bu Qingmei, Hou Yuping, Fang Hongkun, Zhang Zhiliang, Bai Xinfu

1. School of Life Sciences, Ludong University Yantai 264025
• Received:2016-03-21 Revised:2017-02-06 Online:2017-05-25 Published:2017-06-22

Abstract: [Objective] Rhus typhina is an exotic tree species widely planted in the Yellow River basin and North China, but there is still controversy about whether it is an invasive plant. This paper explores the eco-physiological mechanism of R. typhina invasion by comparing it with its indigenous congeners Rhus chinensis in terms of their photosynthetic performance, resource-use efficiency, and construction cost to provide a reference for the comprehensive prevention and control of R. typhina, or planting. [Method] In this study, the photosynthetic performance parameters of R. typhinaand R. chinensis were measured with a TPS-2 photosynthetic system; the light use efficiency (LUE) and water use efficiency (WUE) were calculated according to the related parameters. The total nitrogen content of leaves was analysed with a Vario Micro Cube element analyzer. The gross calorific value was evaluated with a C2000 oxygen bomb calorimeter, and the leaf photosynthetic nitrogen use efficiency (PNUE) and construction cost were thus calculated. [Result] The apparent quantum efficiency (AQY), maximum net photosynthetic rate (Pmax) and respiratory rate in R. typhina were higher than those of its indigenous congeners R. chinensis, but the differences were significant (P<0.05) only in September. The light saturation and compensation point and chlorophyll content were not significantly different (P>0.05) between the two species. The LUE and PNUE of R. typhina were significantly higher than those of R. chinensis(P<0.05) in September, but the WUE of the latter was significantly higher than that of the former in July. The gross caloric value, mass-based (CCmass) and area-based (CCarea) leaf construction cost were all lower in R. typhina than in its indigenous congeners R. chinensis, but the reverse was the case in terms of the specific leaf area (SLA). Furthermore, the two-factor analysis of variance showed that the differences of the photosynthetic performance indices, resource-use efficiency indicators and leaf construction cost between the two species were insignificant (P >0.05), but differences in the indexes among different measurement periods were very significant (P<0.01). It is therefore concluded that although the photosynthetic capacity, resource-use efficiency inR. typhina is higher compared with R. chinensis at the later stage of the annual growing season (September), there is no significant difference in those indexes between the two species as a whole. [Conclusion] Compared with its indigenous congeners R. chinensis, R. typhina has some characteristics of invasive plants in physiological and ecological property, but the competitive advantage only appeared in the later stage of the annual growing season.