Chin J Plant Ecol ›› 2019, Vol. 43 ›› Issue (2): 131-138.doi: 10.17521/cjpe.2019.0291

• Research Articles • Previous Articles     Next Articles

Conduits anatomical structure and leaf traits of diffuse- and ring-porous stems in subtropical evergreen broad-leaved forests

ZHANG Zhen-Zhen1,*(),ZHAO Ping2,ZHANG Jin-Xiu1,SI Yao1   

  1. 1 School of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, Zhejiang 231004, China
    2 South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China
  • Received:2018-11-14 Accepted:2019-01-30 Online:2019-06-04 Published:2019-02-20
  • Contact: ZHANG Zhen-Zhen E-mail:zhangzhen@zjnu.cn
  • Supported by:
    Supported by the National Natural Science Foundation of China(41630752);Supported by the National Natural Science Foundation of China(41701226);the Zhejiang Province Public Welfare Technology Application Research Project(GF19C030003)

Abstract: <i>Aims</i>

The conduits characters are critical for plants to develop their survival strategies. Our current knowledge in this regard remains limited for the subtropical forest. In this study, we set a study objective to quantify the relationship between the conduits characters and the leaf functional traits of the dominant species in the region.

<i>Methods</i>

Two dominant species, Castanopsis chinensis and Schima superba, in a subtropical forest in Shimentai Nature Reserve were selected to compare their differences in functional traits, including conduits anatomical structure, the leaf morphological characteristics, and leaf physiological characteristics. The study was conducted during the dry season (October to March of the following year) for quantifying the ring-porous and diffuse-porous species. A series of t-tests were performed to quantify the statistical differences of all traits between the two species.

<i>Important findings</i>

We found that the density of conduits of S. superba (diffuse-porous) was significantly higher than that of C. chinensis (ring-porous), while the diameter of conduits for C. chinensis was much larger than that of S. superba. The leaf water content and the Chlorophyll a/Chlorophyll b ratio were much higher for S. superba than that of C. chinensis; the stomatal density and specific leaf area (SLA) tended to be higher in C. chinensis. In addition, it appeared that the differences in leaf specific net photosynthetic rates and the leaf stomatal conductance were not significant between S. superba and C. chinensis. These results indicated that the ring-porous species C. chinensis maintain a high photosynthetic capacity by maintaining a higher SLA at the expense of low leaf water content in responding to the water stress. The diffuse-porous species S. superba, meanwhile, tended to maintain a high capability of light transform under drought. These functional differences might be responsible for the succession pathways under the gradual changes of global precipitation for the region.

Key words: ring-porous, diffuse-porous, leaf trait, survival strategy, subtropical forest

Table 1

Community characteristics of the two dominant tree species of the subtropical forest in Shimentai of Guangdong Province"

树种
Species

Family
相对覆盖度
Relative
coverage
相对密度
Relative
density
相对频度
Relative
frequency
重要值
Important
value
样本量
Sample
size
树高(平均值±
标准误差)
Tree height
(mean ± SE) (m)
桂林栲
Castanopsis chinensis
壳斗科 Fagaceae 0.22 0.06 0.04 0.32 137 13.2 ± 2.1
木荷 Schima superba 山茶科 Theaceae 0.15 0.03 0.02 0.20 69 15.4 ± 1.3

Fig. 1

Microscopic images of conduits in Schima superba and Castanopsis chinensis."

Fig. 3

Specific leaf area (SLA), leaf water content (LWC), stomatal quantity (Sd) and size (Ss) of Schima superba and Castanopsis chinensis (mean ± SE). *, p < 0.05; **, p < 0.01."

Fig. 4

Leaf chlorophyll (Chl) content, Chl a/b, net photosynthetic rate (Pn), stomatal conductance (Cond), leaf transpiration rate (Tr) and instantaneous water use efficiency (WUEi) for Schima superba and Castanopsis chinensis (mean ± SE). *, p < 0.05; **, p < 0.01."

Fig. 2

Mean (± SE) of conduit density and diameter for Schima superba and Castanopsis chinensis. **, p < 0.01."

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