祁连山中部优势灌木物种叶功能性状参数变化特征

Abstract

PDF HTML阅读 XML下载 导出引用 引用提醒 祁连山中部优势灌木物种叶功能性状参数变化特征 DOI: 10.5846/stxb202104020859 作者: 作者单位: 作者简介: 通讯作者: 中图分类号: 基金项目: 国家自然科学基金项目（31901130）；重点生态保护修复治理专项资金（张山水胡办【2018】20号）；甘肃省引导科技创新发展专项资金（2017zx-10）；甘肃省自然科学基金（20JR5RA277） Temporal variation of leaf functional traits of dominant shrub species in the middle section of Qilian Mountains Author: Affiliation: Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:植物叶功能性状是连接植物与外界环境的重要桥梁，是探索植物适应环境、进行全球气候变化研究的指标，也是生态水文模型重要的输入参数。通过高时间分辨率样品的采集结合图像处理技术，对祁连山中部优势物种金露梅（Dasiphora fruticosa）和鬼箭锦鸡儿（Caragana jubata）叶功能性状变化特征进行研究，结果表明：叶面积（LA）从生长初期到生长末期发生明显变化，且2020年6-7月初灌木叶面积变化最为明显；比叶面积（SLA）分别在76-157 cm2/g之间和120-217 cm2/g之间，金露梅SLA平均值（123 cm2/g）<鬼箭锦锦鸡儿SLA平均值（176 cm2/g）；在生长初期金露梅的叶面积指数（LAI）明显大于鬼箭锦鸡儿，金露梅和鬼箭锦鸡儿的叶面积指数随时间的变化都符合三次函数；生物量与基径和高度的乘积呈显著性相关，最优回归模型均为幂函数；地上生物量与叶功能性状参数在不同阶段的模拟方程均不同，地上总生物量与叶生物量在生长期的最优选择模型分别呈S型函数和幂函数，金露梅的单株地上生物量在不同阶段与SLA的最优模型均为对数函数。 Abstract:Leaf functional traits are important bridge between plants and their external environment. They are not only indexes to explore the adaptation of plants to the environment and to study global climate changes, but also important input variables for eco-hydrological models. We selected dominant shrub species Dasiphora fruticosa and Caragana jubata in the middle section of Qilian Mountains as our study objects. The change characteristics of leaf functional traits were studied by collecting lead sample in high time resolution. Results showed that the leaf area (LA) changed significantly from early June to early July 2020, The specific leaf area (SLA) of Dasiphora fruticosa and Caragana jubata was between 76-157 cm2/g and 120-217 cm2/g, respectively. The mean SLA of Dasiphora fruticosa (123 cm2/g) was less than that of Caragana jubata (176 cm2/g). The leaf area index (LAI) of Dasiphora fruticosa was significantly higher than that of Caragana jubata during the growing period. The changes of leaf area index of them with time was optimally expressed by the cubic function. The optimal relationship between biomass of shrub and the product of base diameter and height was power function. Expressions of aboveground biomass per plant and leaf functional parameters in different growing phases were different, the optimal model selected between aboveground biomass per plant and leaves biomass was S function for Dasiphora fruticosa and power function for Caragana jubata. Aboveground biomass per plant of Dasiphora fruticosa with of the SLA in different stages could be simulated by logarithmic function, while other leaf functional traits could be simulated by cubic functions. 参考文献 相似文献 引证文献