• 研究报告:植物多样性 •

### 中国亚热带不同菌根树种的根叶形态学性状特征与生长差异: 以江西新岗山为例

1. 1.国家林业与草原局鄱阳湖流域森林生态系统保护与修复重点实验室, 南昌 330045
2.江西农业大学林学院, 南昌 330045
3.九连山森林生态系统国家定位观测研究站, 南昌 330045
• 收稿日期:2020-09-17 接受日期:2020-11-17 出版日期:2021-06-20 发布日期:2020-12-11
• 通讯作者: 卜文圣
• 作者简介:* E-mail: bws2007@163.com
• 基金资助:
国家自然科学基金(31760134);江西省青年科学基金(20202ACBL215005);中国国家留学基金(201908360227)

### Growth differences and characteristics of root and leaf morphological traits for different mycorrhizal tree species in the subtropical China: A case study of Xingangshan, Jiangxi Province

Yuanli Ouyang1,2,3, Cancan Zhang1,2, Xiaofan Lin1,2, Lixin Tian2, Hanjiao Gu1,2, Fusheng Chen1,2,3, Wensheng Bu1,2,3,*()

1. 1 Key Laboratory of State Forestry and Grassland Administration on Forest Ecosystem Protection and Restoration of Poyang Lake Watershed, Nanchang 330045
2 College of Forestry, Jiangxi Agricultural University, Nanchang 330045
3 Jiulianshan National Observation and Research Station of Forest Ecosystem, Nanchang 330045
• Received:2020-09-17 Accepted:2020-11-17 Online:2021-06-20 Published:2020-12-11
• Contact: Wensheng Bu

Abstract

Aims: Exploring the intraspecific and interspecific variations in plant functional traits is not only beneficial for understanding plant adaptation to different environmental factors, but also helpful as a reflection on the ecological strategy. However, the adaptation strategies of root and leaf morphological traits in the growth process of different mycorrhizal tree species need to be explored.

Methods: We studied seven arbuscular mycorrhizal (AM) tree species and seven ectomycorrhizal (EM) tree species in the Biodiversity-Ecosystem Functioning Experiment China Platform (BEF-China). We studied the characteristics of root and leaf morphological traits of different mycorrhizal tree species by measuring the following morphological traits and growth indices: specific leaf area, leaf dry matter content, specific root length, average diameter, the growth rate of tree height, the growth rate of basal diameter, and fine root biomass.

Results: We found that when compared with AM tree species, EM tree species had lower specific leaf area, average diameter of absorbing root, and growth rate (including tree height and basal diameter). EM species had a higher leaf dry matter content. There were no significant differences in the specific root length and fine root biomass between the two types of mycorrhizal tree species. There were significant differences in specific leaf area, leaf dry matter content, the growth rate of tree height, the growth rate of basal diameter and fine root biomass between tree species, mycorrhizal types and the interaction between the two. Additionally, tree species, root functional type, mycorrhizal type and the interaction between tree species with root functional types and mycorrhizal types had significant effects on root functional traits. The intraspecific variation of the aboveground growth indices of EM tree species was greater than that of interspecific variation, whereas the intraspecific variation was similar to the interspecific variations of the above-ground indices of AM tree species. Furthermore, the intraspecific variation was greater than the interspecific variation of fine root biomass for all tree species. Although the above-ground growth for two types of mycorrhizal tree species had a faster growth rate, they usually showed low leaf dry matter content. AM tree species had a high specific root length for absorbing roots, while EM tree species had a high average diameter for transporting roots. Low specific root length of the absorbing roots greatly increased the fine root biomass for all the tree species.

Conclusions: Therefore, there was a certain synergistic effect between root and leaf morphological traits on plant growth above ground. Transporting roots mainly played an important role in the above-ground growth of EM tree species. Whereas absorptive roots mainly were related to the above-ground growth of AM tree species. However, below ground growth was mainly related to the absorptive root for all tree species.