Ecophysiological adaptability of four tree species in the southern subtropical evergreen broad-leaved forest to warming
Xu LI,, Ting WU, Yan CHENG, Na-Dan TAN, Fen JIANG, Shi-Zhong LIU, Guo-Wei CHU, Ze MENG, Ju-Xiu LIU,*Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China
National Natural Science Foundation of China(41977287) National Natural Science Foundation of China(41991285) Special Forestry Project of Guangdong Province (Monitoring and Research on the Impact of Environmental Change on wild Plant Diversity)
Abstract Aims The subject of this study was to investigate warming effects on leaf stomatal traits, anatomical structure and photosynthetic traits of four common tree species in subtropical evergreen broad-leaved forest of southern China, and to compare their physiological adaptability to warming. Our study aims to provide a theoretical basis for better predicting the tree growth of native forests in a warming climate. Methods One-year-old seedlings of Syzygium rehderianum, Ormosia pinnata, Castanopsis hystrix and Schima superba were selected and exposed to two levels of temperature (ambient temperature and infrared heater warming). Leaf stomatal traits, anatomical structure and photosynthetic characteristics were measured to represent the abilities of stomatal regulation, leaf tissue regulation and nutrient maintenance, respectively. Important findings For Syzygium rehderianum, warming decreased its leaf sponge tissue thickness, photosynthetic nitrogen-use efficiency (PNUE) and photosynthetic phosphorous-use efficiency (PPUE). Seedling of O. pinnata exposed to warming showed increased stomatal conductance, photosynthetic rate, PNUE and PPUE, but decreased stomatal density, leaf thickness and palisade tissue thickness. For C. hystrix, warming decreased the stomata size, but did not affect its photosynthetic rate. Seedling of Schima superba exposed to warming showed lower stomata density, leaf palisade tissue thickness, photosynthetic rate, PNUE and PPUE, but higher stomata size. These results suggested that O. pinnata, Syzygium rehderianum and Schima superba could reduce their leaf thickness to acclimate to warming conditions. The abilities of stomatal regulation, nutrient maintenance, photosynthetic rate and PNUE varied among these tree species. Warming would be beneficial for the growth of O. pinnata due to increased photosynthetic rate, PNUE and PPUE, while not for Syzygium rehderianum and Schima superba, the two dominant tree species of native forests. This study indicated that, with projected climate change, O. pinnata may replace Syzygium rehderianum and Schima superba as a new dominant tree species in the subtropical evergreen broad-leaved forest for its stronger adaptability to warming. Keywords:infrared heating;stomatal size;stomatal density;leaf anatomical structure;photosynthesis;subtropical tree species
PDF (2289KB)元数据多维度评价相关文章导出EndNote|Ris|Bibtex收藏本文 引用本文 李旭, 吴婷, 程严, 谭钠丹, 蒋芬, 刘世忠, 褚国伟, 孟泽, 刘菊秀. 南亚热带常绿阔叶林4个树种对增温的生理生态适应能力比较. 植物生态学报, 2020, 44(12): 1203-1214. DOI: 10.17521/cjpe.2020.0318 LI Xu, WU Ting, CHENG Yan, TAN Na-Dan, JIANG Fen, LIU Shi-Zhong, CHU Guo-Wei, MENG Ze, LIU Ju-Xiu. Ecophysiological adaptability of four tree species in the southern subtropical evergreen broad-leaved forest to warming. Chinese Journal of Plant Ecology, 2020, 44(12): 1203-1214. DOI: 10.17521/cjpe.2020.0318
CT, 角质层厚度; LT, 叶片厚度; LET, 下表皮厚度; PT, 栅栏组织; ST, 海绵组织厚度; UET, 上表皮厚度。 Fig. 1Leaf anatomical structure and stomatal characteristics of four tree species in southern subtropical evergreen broad-leaved forest.
新窗口打开|下载原图ZIP|生成PPT 图3增温对南亚热带常绿阔叶林4个树种的气孔导度(Gs)、气孔密度(SD)和气孔大小(SS)的影响(平均值+标准误差, n = 6)。*, p < 0.05; **, p < 0.01; ***, p < 0.001。
Fig. 3Effects of warming on stomatal conductance (Gs), stomatal density (SD), and stomatal size (SS) of four tree species in southern subtropical evergreen broad-leaved forest (mean + SE, n = 6).*, p < 0.05; **, p < 0.01; ***, p < 0.001.
Table 1 表1 表1增温(W)、树种(S)及其交互作用对南亚热带常绿阔叶林4个树种叶片解剖结构和光合特性的双因素方差分析 Table 1Effects of warming (W), tree species (S) and their interactions on the leaf anatomical structure and photosynthetic characters of four tree species in southern subtropical evergreen broad-leaved forest
新窗口打开|下载原图ZIP|生成PPT 图4增温对南亚热带常绿阔叶林4个树种叶片厚度(LT)、栅栏组织厚度(PT)和海绵组织厚度(ST)的影响的箱型图。图中的数据节点依次为上限、上四分位数、中位数、下四分位数和下限。圆圈为数据点。*, p < 0.05; **, p < 0.01; ***, p < 0.001; n = 9。
Fig. 4Box plots illustrating the effects of warming on leaf thickness (LT), palisade tissue thickness (PT) and sponge tissue thickness (ST) of four tree species in southern subtropical evergreen broad-leaved forest. Whiskers of box plots indicates upper extreme, upper quartile, median, lower quartile and lower extreme, respectively. Each circle represents one individual tree. *, p < 0.05; **, p < 0.01; ***, p < 0.001; n = 9.
图5
新窗口打开|下载原图ZIP|生成PPT 图5增温对南亚热带常绿阔叶林4个树种叶片上、下表皮厚度(UET、LET)和角质层厚度(CT)的影响的箱型图。图中的数据节点依次为上限、上四分位数、中位数、下四分位数和下限。圆圈为数据点。*, p < 0.05; **, p < 0.01; ***, p < 0.001; n = 9。
Fig. 5Box plots illustrating the effects of warming on leaf upper epidermis thickness (UET), lower epidermis thickness (LET) and cuticle thickness (CT) of four tree species in southern subtropical evergreen broad-leaved forest. Whiskers of box plots indicates upper extreme, upper quartile, median, lower quartile and lower extreme, respectively. Each circle represents one individual tree. *, p < 0.05; **, p < 0.01; ***, p < 0.001; n = 9.
新窗口打开|下载原图ZIP|生成PPT 图6增温对南亚热带常绿阔叶林4个树种的光合速率(Pn)、蒸腾速率(Tr)和水分利用效率(WUE)的影响(平均值+标准误差, n = 6)。*, p < 0.05; **, p < 0.01; ***, p < 0.001。
Fig. 6Effects of warming on photosynthetic rate (Pn), transpiration rate (Tr), and water use efficiency (WUE) of four tree species in southern subtropical evergreen broad-leaved forest in 2018 and 2019 (mean + SE, n = 6). *, p < 0.05; **, p < 0.01; ***, p < 0.001.
图7
新窗口打开|下载原图ZIP|生成PPT 图7增温对南亚热带常绿阔叶林4个树种的光合氮利用效率(PNUE)和光合磷利用效率(PPUE)的影响(平均值+标准误差, n = 6)。*, p < 0.05; **, p < 0.01; ***, p < 0.001。
Fig. 7Effects of warming on the photosynthetic nitrogen-use efficiency (PNUE) and photosynthetic phosphorous-use efficiency (PPUE) of four tree species in southern subtropical evergreen broad-leaved forest in 2018 and 2019 (mean + SE, n = 6). *, p < 0.05; **, p < 0.01; ***, p < 0.001.
以Pn与Gs线性回归的斜率作为植物的光合敏感性(Wu et al., 2018)。回归分析表明增温改变了4个树种的光合敏感性(表2), 增温下海南红豆和红锥的光合敏感性由显著相关(p < 0.05)变为不相关, 增温下红枝蒲桃和木荷的光合敏感性有降低的趋势, 但未达到显著水平。
Table 2 表2 表2增温和对照条件下南亚热带常绿阔叶林4个树种光合速率和气孔导度的关系(一元线性回归) Table 2Relationship between photosynthesis rate and stomatal conductance under control and warming environments of four tree species in southern subtropical evergreen broad-leaved forest (unary linear regression)
Table 3 表3 表3南亚热带常绿阔叶林4个树种叶片解剖结构特征与光合特征相关关系 Table 3Correlations between leaf anatomical structure and photosynthetic characters of four tree species in southern subtropical evergreen broad-leaved forest
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Nitrogen-total//Page AL. Methods of Soil Analysis, Part 2: Chemical and Microbiological Properties 1 1982
Photosynthesis and leaf nitrogen in five Amazonian tree species during early secondary succession 1 1996
... 由于在自然生态系统中常常缺乏可利用的N, 对植物的生长造成限制(Onoda et al., 2017), 因此具有较高PNUE的植物常常具有更高的生长速率(Robinson et al., 2001)及在生态系统中较强的竞争能力, 同时高PNUE也有利于植物的进化(Reich et al., 1994).而较低PNUE的植物叶片则常常具有较高的耐受环境胁迫的能力(Ellsworth & Reich, 1996; van Ommen et al., 2012)及较高的叶片寿命(Onoda et al., 2017), 能够使得叶片在整个生命周期中充分利用其内部的N进行光合作用(Escudero & Mediavilla, 2003).我们发现增温条件下红枝蒲桃和木荷的PNUE和PPUE降低, 红锥的PNUE和PPUE无显著变化, 而海南红豆的PNUE和PPUE升高, 这表明红枝蒲桃和木荷为适应高温环境, 采取了降低PNUE和PPUE的策略, 而海南红豆却表现出对高温环境的良好适应性, 在未来气候变暖的情况下在该生态系统中可能具有较强的竞争能力.基于鼎湖山站长期的原位监测也发现, 在全球气候变化下南亚热带常绿阔叶林有向灌丛化演替的趋势(Zhou et al., 2013).此外, 由于海南红豆是豆科植物, 较好的N吸收能力也可能是其PNUE升高的原因(Liu et al., 2013). ...
Decline in photosynthetic nitrogen use efficiency with leaf age and nitrogen resorption as determinants of leaf life span 1 2003
... 由于在自然生态系统中常常缺乏可利用的N, 对植物的生长造成限制(Onoda et al., 2017), 因此具有较高PNUE的植物常常具有更高的生长速率(Robinson et al., 2001)及在生态系统中较强的竞争能力, 同时高PNUE也有利于植物的进化(Reich et al., 1994).而较低PNUE的植物叶片则常常具有较高的耐受环境胁迫的能力(Ellsworth & Reich, 1996; van Ommen et al., 2012)及较高的叶片寿命(Onoda et al., 2017), 能够使得叶片在整个生命周期中充分利用其内部的N进行光合作用(Escudero & Mediavilla, 2003).我们发现增温条件下红枝蒲桃和木荷的PNUE和PPUE降低, 红锥的PNUE和PPUE无显著变化, 而海南红豆的PNUE和PPUE升高, 这表明红枝蒲桃和木荷为适应高温环境, 采取了降低PNUE和PPUE的策略, 而海南红豆却表现出对高温环境的良好适应性, 在未来气候变暖的情况下在该生态系统中可能具有较强的竞争能力.基于鼎湖山站长期的原位监测也发现, 在全球气候变化下南亚热带常绿阔叶林有向灌丛化演替的趋势(Zhou et al., 2013).此外, 由于海南红豆是豆科植物, 较好的N吸收能力也可能是其PNUE升高的原因(Liu et al., 2013). ...
Specific leaf area relates to the differences in leaf construction cost, photosynthesis, nitrogen allocation, and use efficiencies between invasive and noninvasive alien congeners 1 2008