植物生态学报 ›› 2017, Vol. 41 ›› Issue (9): 985-994.doi: 10.17521/cjpe.2017.0005

• 研究论文 • 上一篇    下一篇

秦王川盐沼湿地芦苇比叶面积与叶片热耗散的关联性分析

李群, 赵成章*(), 赵连春, 王建良, 张伟涛, 姚文秀   

  1. 西北师范大学地理与环境科学学院, 甘肃省湿地资源保护与产业发展工程研究中心, 兰州 730070
  • 收稿日期:2017-01-07 修回日期:2017-07-09 出版日期:2017-09-10 发布日期:2017-10-23
  • 通讯作者: 赵成章 E-mail:zhaocz601@163.com
  • 基金资助:
    国家自然科学基金(41461013和91125014)

Empirical relationship between specific leaf area and thermal dissipation of Phragmites australis in salt marshes of Qinwangchuan

Qun LI, Cheng-Zhang ZHAO*(), Lian-Chun ZHAO, Jian-Liang WANG, Wei-Tao ZHANG, Wen-Xiu YAO   

  1. College of Geography and Environmental Science, Northwest Normal University, Research Center of Wetland Resources Protection and Industrial Development Engineering of Gansu Province, Lanzhou 730070, China
  • Received:2017-01-07 Revised:2017-07-09 Online:2017-09-10 Published:2017-10-23
  • Contact: Cheng-Zhang ZHAO E-mail:zhaocz601@163.com

摘要:

植物比叶面积(SLA)与叶片热耗散的关联性分析, 对于探究植物光合产物积累与耗散及其适应特殊生境有重要意义。该研究以秦王川国家湿地公园芦苇(Phragmites australis)种群为研究对象, 根据距离水域的远近分别依次设置3个试验样地: I (离水域25-40 m, 土壤含水量(SM) 28.94%)、II (离水域10-25 m, SM 45.97%)、III (离水域0-10 m, SM 76.81%), 研究了秦王川盐沼湿地芦苇SLA与叶片热耗散的关系。结果表明: 随着土壤含水量的增加, 湿地植被群落的高度和地上生物量呈现逐渐增加的趋势, 土壤电导率和光合有效辐射呈显著减小的趋势; 叶面积、净光合速率和蒸腾速率均呈增加的趋势, 叶厚度呈减少的趋势, SLA呈现先增加后减小的趋势, 叶干质量呈现先减少后增加的趋势; 从样地I到样地III, 调节性能量耗散的量子产额(Y(NPQ))、非光化学淬灭系数呈减少的趋势, 实际光合效率、光化学淬灭系数呈增加的趋势, 非调节性能量耗散的量子产额呈先增加后减少的趋势; 在样地I和III, 芦苇SLAY(NPQ)呈极显著负相关关系(p < 0.01), 在样地II, SLAY(NPQ)显著负相关(p < 0.05)。随土壤含水量的梯度性变化, 芦苇种群通过调整叶片构建模式从而适时调整SLA的大小以改变叶片热耗散, 实现对植物吸收光能的有效利用, 反映了植物为适应特殊生境通过改变表型调控叶片热耗散实现自我保护的机制。

关键词: 比叶面积, 热耗散, 调节性能量耗散的量子产额, 芦苇, 秦王川, 盐沼湿地

Abstract:
Aims The correlation between specific leaf area (SLA) and thermal dissipation reflects not only the accumulation and dissipation of plant photosynthesis, but also plants’ adaptation to their habitats and changing environment. The objective of this study is to examine the correlation between SLA and thermal dissipation of reed (Phragmites australis) under different soil moisture conditions and salt contents.Methods Our study site was located in the National Wetland Park in Qinwangchuan, Gansu Province, China. Our sampling site extends from the edge to the central of a salt marsh where the reed was the single dominant species. The study site was divided into three zones based on the distance from the water. Within each zone, six 2 m × 2 m sampling plots were randomly located to select six reed individuals in each plot (total = 18). Vegetation height, aboveground biomass, soil moisture, and soil electrical conductivity (EC) were measured, with the six reed individuals taken to the laboratory to measure leaf thickness. Leaf net photosynthetic rate (Pn), transpiration rate (Tr), and other parameters of the reeds were also measured in each plot prior to harvesting. Quantitative measures of chlorophyll fluorescence were taken after 30-min dark adaptation. Quadrat survey method was used to model the empirical relationship between the transpiration rate and leaf characteristics.Important findings Vegetation height and aboveground biomass increased with soil moisture content, but EC and photosynthetically active radiation decreased. Leaf area, Tr and Pn increased along the gradient, leaf thickness showed decreasing, but the increasing trend of SLA switched to a decreasing trend, while leaf dry mass presented an opposite trend. From plot I to III, the quantum yield of regulated energy dissipation (Y(NPQ)) and non-photochemical quenching decreased, the actual photochemical efficiency of PSII and photochemical quenching increased, and quantum yield of non-regulated energy dissipation increased before decreasing. There appeared a highly significant negative correlation (p < 0.01) between SLA and Y(NPQ) at plot I and III, and a less significant negative correlation (p < 0.05) at plot II. Along the soil moisture gradient, reed seemed using light effectively by changing leaf thermal dissipation through adjusting their leaf size and SLA—A potential self-protection mechanism in light of adapting the habitat.

Key words: specific leaf area, thermal dissipation, the quantum yield of regulated energy dissipation, Phragmites australis, Qinwangchuan, salt marshes