地形和光照因子对白云山国家森林公园苔藓植物功能性状的影响

Effects of topographic and light factors on bryophytes functional traits in Baiyun Mountain National Forest Park

为探讨地形和光照因子对白云山国家森林公园苔藓植物功能性状的影响,测定了监测样地中52种苔藓植物的8种功能性状指标,包括株高、叶面积、叶长宽比、叶中部细胞长、叶中部细胞宽、蒴柄长、孢子直径和孢子外壁厚度,并结合地形因子数据(海拔、凹凸度、坡度和坡向)和光照因子数据(叶面积指数、冠层覆盖度、平均叶倾角、冠层下散射辐射、冠层下直接辐射和总透光比),采用冗余分析法和Pearson相关分析法分析影响苔藓植物功能性状的主要驱动因子。结果表明,苔藓植物功能性状的叶中部细胞宽和叶面积差异最明显,最小值分别是5.05μm和0.32 mm 2,最大值分别是23.00μm和2.69 mm 2。海拔和坡向是影响白云山国家森林公园苔藓植物功能性状最关键的2个地形因子,平均叶倾角和冠层下直接辐射是影响该区域植物功能性状最主要光照因子,海拔和凹凸度为显著负相关,叶面积指数与海拔为极显著负相关。

To explore the effect of topographic and light factors on the functional traits of bryophytes in Baiyun Mountain National Forest Park,the 8 kinds of function indicators of 52 species of bryophytes in a fixed monitored sample plot were measured,including stem length,leaf area,leaf length to width ratio,middle cell length,middle cell width,capsule length,spore diameter and spore thickness.In combination with the statistics of topographic factors(elevation,slope,aspect and convex and concave)and light factors(leaf area index,canopy cover,average leaf angle,scattered radiation,direct radiation and total transmittance ratio of light),the main driving factors affecting the functional traits of bryophytes were analyzed by redundancy analysis(RDA)and Pearson correlation analysis.The results showed that the difference of middle cell width and leaf area was the most obvious.The minimum values of the two traits were 5.05μm and 0.32 mm 2,and the maximum values were 23.00μm and 2.69 mm 2.Elevation and aspect were the two most important topographic factors affecting the functional traits of bryophytes in Baiyun Mountain National Forest Park,while the average leaf angle and the direct radiation were the most important light factors affecting the functional traits of bryophytes in this area.There was a significant negative correlation between elevation and convexity,and a negative correlation between LAI and elevation.