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此论文已被《生态学报》录用,现已优先出版,可查看文章PDF版本!
盘远方,陈兴彬,姜勇,梁士楚,陆志任,黄宇欣,倪鸣源,覃彩丽,刘润红.桂林岩溶石山灌丛植物叶功能性状和土壤因子对坡向的响应.生态学报,2018,(5).http://dx.doi.org/10.5846/stxb201701210173  
桂林岩溶石山灌丛植物叶功能性状和土壤因子对坡向的响应
Changes in leaf functional traits and soil environmental factors in response to slope gradient in Karst hills of Guilin
投稿时间:2017-01-21  修订日期:2017-10-17
DOI: 10.5846/stxb201701210173
关键词坡向梯度  土壤环境因子  植物叶功能性状  岩溶石山
Key WordsSlope gradient  soil environmental factors  plant leaf functional traits  Karst hills
基金项目广西壮族自治区中青年教师基础能力提升项目,ky2016YB062,桂林岩溶石山灌丛植物功能性状及多样性研究,2016/01⁃2017/12; 2017 年度自治区级大学生创新创业训练计划项目,201411000124,桂林岩溶石山青冈栎群落植物功能性状的尺度变化与关联,2017/03⁃2018/03
作者单位E-mail
盘远方 珍稀濒危动植物生态与环境保护省部共建教育部重点实验室 yuanfangpan124@163.com 
陈兴彬 江西省林业科学院 江西省植物生物技术重点实验室  
姜勇 广西师范大学 yongjiang226@126.con 
梁士楚 珍稀濒危动植物生态与环境保护省部共建教育部重点实验室  
陆志任 珍稀濒危动植物生态与环境保护省部共建教育部重点实验室  
黄宇欣 珍稀濒危动植物生态与环境保护省部共建教育部重点实验室  
倪鸣源 珍稀濒危动植物生态与环境保护省部共建教育部重点实验室  
覃彩丽 珍稀濒危动植物生态与环境保护省部共建教育部重点实验室  
刘润红 珍稀濒危动植物生态与环境保护省部共建教育部重点实验室  
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摘要:
植物功能性状反映了植物对生长环境的响应和适应,是连接植物与环境的桥梁,研究植物功能性状特征及其随坡向梯度的变化规律,对认识不同微气候生境下植物群落空间格局形成及适应机制具有重要意义。以桂林岩溶石山灌丛植物为研究对象,分析了灌木群落水平上植物叶功能性状与环境因子关系随阴坡-阳坡梯度的变化规律。结果表明:比叶面积为阴坡大于阳坡,叶干物质含量和叶片厚度为阳坡大于阴坡;土壤含水量、有机质含量、总有机碳含量和有效氮含量为阴坡大于阳坡,土壤温度和土壤全氮含量为阳坡大于阴坡;多元逐步回归分析表明,影响群落水平植物叶功能性状的主要环境因子随阴坡-阳坡梯度而发生显著的变化。在阴坡上,对比叶面积影响显著的是土壤有效氮含量,对叶干物质含量影响显著的是土壤温度和土壤总有机碳含量。而在阳坡上,对比叶面积影响显著的环境因子是土壤含水量和土壤pH值,对叶干物质含量影响显著的环境因子是土壤全氮含量,对叶片厚度影响显著的环境因子是土壤温度、土壤全氮含量和土壤全磷含量。同一叶功能性状在阴坡-阳坡梯度上受到不同环境因子的控制,同时各叶功能性状又能够对阴坡-阳坡所处特殊生境产生一定的适应性。
Abstract:
Plant functional traits, defined as morpho-physio-phenological traits, reflect the responses and adaptations of plants to the environment, and function as a bridge between the plant and factors of its environment. Varying leaf functional traits is an important strategy used by plants when adapting to changes in environmental gradient. Research on the relationship between shrub leaf functional traits and soil environmental factors in sloped (shady-sunny) gradients indicate that plants are able to respond and adapt to changes in the nature of spatial patterns at the levels of landscapes and microhabitats. In the present study, we explored how shrub leaf functional traits responded to soil environmental factors, and examined the correlation between changes in this relationship and slope gradient in the Karst hills of Guilin. Experiments were carried out at 24 sampling points with gradients sloping from the middle area of the hills to the foot of the hills (shady-sunny). In total, 24 plots (10 m × 10 m) were sampled. Individuals of shrub species with stem base diameter (SBD) ≥ 1 cm were identified, and the functional traits of these plants and the soil environmental factors of each plot were measured. We then carried out non-parametric Wilcoxon signed rank tests to assess differences in three shrub leaf functional traits (specific leaf area, SLA; leaf dry matter content, LDMC; and leaf thickness, LT) and in eight soil environmental factors (soil water content, SWC; soil temperature, Tem; pH; total organic carbon, TOC; soil organic matter, SOM; total nitrogen, TN; available nitrogen, AN; and total phosphorus, TP) along the slope gradient. Based on the results of this analysis, we used multiple stepwise regression analyses to determine the primary soil factors controlling variation in shrub leaf functional traits at the community level in relation to slope gradient. We observed that SLA in shady areas of the slope was greater than that in sunny areas of the slope, whereas LDMC and LT were higher in sunny areas of the slope. SWC, SOM, TOC and AN were higher in the shady areas of the slope, whereas Tem and TN were higher in sunny areas. Multiple regression analyses of leaf functional traits and soil factors indicated that, in shady areas of the slope, SLA was affected by AN, and that LDMC was primarily affected by Tem and TOC; however, there was no significant relationship between LT and soil environmental factors. In sunny areas of the slope, SWC and pH were the primary drivers of variation in SLA, whereas LDMC was affected primarily by TN. However, LT was affected by a combination of Tem, TN and TP. These results indicate that in different areas of the slope gradient (shady-sunny), the same leaf functional traits respond to different environmental factors, enabling adaptation to specific environmental conditions.
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