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桂西南岩溶区8 种适生植物光合性状的变异与关联

Variation and correlation of the photosynthetic traits of 8 adaptive plants in the karst region of Southwest Guangxi

摘要:为探究岩溶植物的光合生理适应机制,采用 Li-6400XT 便携式光合作用测量系统,对广西平果市岩溶区 8 种适生植物的叶片净光合速率(Pn)、气孔导度(Gs)、胞间 CO2 浓度(Ci)、蒸腾速率(Tr)、水分利用效率(WUE) 和气孔限制值(Ls)等光合特征参数进行了测定分析。结果表明:6 个光合特征参数在种内和种间均存在不同程度的 变异,且种内变异均大于种间变异。Gs 和 Tr 的变化主要来源于种间变异(46.72% ~ 49.76%),而 Pn、Ci、WUE和 Ls 变化主要来源于种内变异(48.66% ~ 64.50%)。在生活型水平,Pn、Gs 和 Tr 的种内变异表现为常绿植物小于落叶 植物,而 Ci、WUE 和 Ls 则相反。各参数的种间变异均表现为落叶植物大于常绿植物。无论在种内还是种间, Gs的 总体变异程度最大,其次是Tr和Pn,再次是Ls和WUE,Ci最小。Pn、Gs和Tr三者之间呈显著正相关关系(P<0.01); Ls 与 WUE 呈显著正相关关系(P<0.05),与 Gs 和 Ci 呈显著负相关关系(P<0.05)。这种关系与全球尺度基本一致, 反映了植物对资源的权衡策略,验证了岩溶植物叶经济谱(LES)的存在。常绿植物具有较高的 Ls、WUE 和较低的 Gs、Tr、Ci 及 Pn,在 LES 中的位置更靠近具有高 WUE、低蒸腾、低光合等特点的缓慢投资-收益型物种的一端,而 落叶植物与之相反,位于低 WUE、高蒸腾、高光合等特点的快速投资-收益型物种的一端,表明植物通过性状间 的协同与权衡,采取了不同的生存策略适应变化的环境。研究结果为后续筛选适生物种,加速植被恢复演替进程提 供了科学依据。

英文摘要:In order to explore the photosynthetic physiological adaptation mechanism of karst plant, Li-6400XT portable photosynthesis system were used to detect the leaf photosythetic parameters of eight karst adaptable plants in Pingguo City, Guangxi, including net photosynthetic rate (Pn), stomatal conductivity (Gs), intercellular CO2 concentration (Ci), transpiration rate (Tr), water use efficiency (WUE) and stomatal limitation value (Ls). Statistical methods, such as Pearson correlation analysis, principal component analysis (PCA), and permutational multivariate analysis of variance (PERMANOVA) were used in this study. The results showed the six photosynthetic parameters had different variation within and between species, and all the intraspecific variations were greater than the interspecific. Change of Gs and Tr mainly originated from interspecific variation (46.72% - 49.76%), while that of Pn 、Ci 、WUE and Ls mainly from intraspecific variation (48.66% - 64.50%). At the life form level, the intraspecific variations of Pn、Gs and Tr of evergreen plants were less than those of deciduous plants, but the intraspecific variation of Ci、WUE and Ls of evergreen plants was higher. Interspecific variations of all the parameters of deciduous plants were greater than those of evergreen plants. Gs variation was the greatest both at the intraspecific and the interspecific level, followed by Tr and Pn, while Ls and WUE, and Ci variation were the least. There were significant positive correlations among Pn、Gs and Tr (P<0.01). Ls was significantly positively correlated with WUE (P<0.05), but negatively with Gs and Ci (P<0.05). The correlations among these photosynthetic parameters are basically consistent with the global scale, which reflects the diverse trade-off strategies of plants to environment resources. The results also verified the leaf economics spectrum (LES) of karst plant. Evergreen plants were located at the slow investment-return end of the LES with high values of Ls, WUE and low values of Gs、Tr、Ci and Pn. On the contrary, deciduous plants were located at the quick investment-return end of the LES with low value of WUE and high value of Pn and Tr. The results reflect karst plant adapt to changing environment with different adaptation strategies by trade-offs or co-ordinations among traits, and provide scientific basis for selecting adaptive tree species and accelerating the succession process of vegetation restoration in the karst area.

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[V1] 2022-08-05 16:38:28 chinaXiv:202208.00044V1 下载全文
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