植物生态学报 ›› 2019, Vol. 43 ›› Issue (2): 131-138.DOI: 10.17521/cjpe.2019.0291
收稿日期:
2018-11-14
接受日期:
2019-01-30
出版日期:
2019-02-20
发布日期:
2019-06-04
通讯作者:
张振振
基金资助:
ZHANG Zhen-Zhen1,*(),ZHAO Ping2,ZHANG Jin-Xiu1,SI Yao1
Received:
2018-11-14
Accepted:
2019-01-30
Online:
2019-02-20
Published:
2019-06-04
Contact:
ZHANG Zhen-Zhen
Supported by:
摘要:
植物导管结构特征对其自身的生存策略具有重要影响, 但目前对于亚热带常绿阔叶林树种这方面的认识仍然不足。为了研究这一地区的植物导管特征与叶片功能性状之间的关系, 该研究选择广东石门台自然保护区亚热带森林中两种优势种桂林栲(Castanopsis chinensis)和木荷(Schima superba), 通过比较旱季(10月至次年3月)两树种的导管形态特征、叶片形态特征、叶片生理特征来研究环孔材树种和散孔材树种的功能性状差异。用独立样本t检验对两个树种的这些性状进行差异性分析。结果表明: 1)木荷(散孔)导管密度显著高于桂林栲(环孔), 而桂林栲导管的直径远大于木荷导管的直径。2)木荷叶片含水量(LWC)、叶绿素a/b值显著大于桂林栲, 而气孔密度和比叶面积则显著低于桂林栲, 两者气孔导度和光合速率并没有显著差异。以上结果表明, 在亚热带森林中, 环孔材树种桂林栲在温度高湿度低的干旱条件下, 能够通过增加叶片比叶面积维持较高的光合能力, 而另一方面, 其叶片对干旱胁迫的耐受性较弱, 而散孔材木荷则具有较好的光能转化能力和干旱耐受能力, 这种差异性在降水格局变化逐渐加深的背景下, 可能会引起森林群落结构发生分化。
张振振, 赵平, 张锦秀, 斯瑶. 亚热带常绿阔叶林散孔材和环孔材树种导管及叶片功能性状的比较. 植物生态学报, 2019, 43(2): 131-138. DOI: 10.17521/cjpe.2019.0291
ZHANG Zhen-Zhen, ZHAO Ping, ZHANG Jin-Xiu, SI Yao. Conduits anatomical structure and leaf traits of diffuse- and ring-porous stems in subtropical evergreen broad-leaved forests. Chinese Journal of Plant Ecology, 2019, 43(2): 131-138. DOI: 10.17521/cjpe.2019.0291
树种 Species | 科 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 |
表1 广东省石门台两种亚热带森林优势树种的详细信息
Table 1 Community characteristics of the two dominant tree species of the subtropical forest in Shimentai of Guangdong Province
树种 Species | 科 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 |
图3 木荷和桂林栲的比叶面积(SLA), 叶片含水量(LWC), 气孔密度(Sd)和气孔大小(Ss)(平均值±标准误差)。*, p < 0.05; **, p < 0.01.
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.
图4 木荷和桂林栲的叶绿素(Chl)含量、Chl a/b、净光合速率(Pn)、气孔导度(Cond)、叶片蒸腾速率(Tr)和叶片瞬时水分利用效率(WUEi)(平均值±标准误差)。*, 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.
图2 木荷和桂林栲导管的密度和直径(平均值±标准误差)。**, 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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