桂林岩溶石山植物群落植物功能性状对不同坡向环境因子的响应
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摘要
该研究以桂林岩溶石山不同坡向的植物群落为对象,探讨植物功能性状(比叶面积、叶绿素含量、木材密度和环境因子随坡向的变化规律。结果表明:比叶面积和叶绿素含量为阴坡>半阴坡>阳坡,阴坡和半阴坡分别与阳坡差异性显著;木材密度为阴坡<半阴坡<阳坡,阴坡、半阴坡分别与阳坡差异性显著。土壤有机质含量表现为阴坡大于阳坡,且阴坡与阳坡差异性显著;土壤全磷、土壤有效磷均表现为阳坡含量最高,且阴坡与阳坡差异性显著;土壤有效钾、土壤全钾则分别为阴坡、半阴坡含量最高,土壤全钾含量在各坡向上差异均显著,而土壤有效钾则为阴坡、半阴坡与阳坡均差异性显著。回归分析表明群落水平比叶面积在阴坡和半阴坡上与土壤有机质含量呈显著负相关;群落水平叶绿素含量与土壤全磷含量和土壤有效钾含量在阴坡上呈显著正相关;在不同坡向梯度上群落水平木材密度与环境因子无相关性。群落水平上植物功能性状随坡向的变化规律,反映了岩溶石山植物群落构建过程中环境对功能性状的筛选效应。
In this study,we measured three plant functional traits( SLA,specific leaf area; CC,leaf total chlorophyll content; WD,wood density) and five environmental factors among different plant communities in karst hills of Guilin to explore the relationship between plant functional traits and environmental factors along the slope( shady,semi-shady,sunny) aspects. The results showed that SLA and CC showed a consistent changing pattern,that is,shady>semi-shape>sunny slope aspects,and significant differences were found between shady and sunny and semi-shady and sunny slope aspects. Whereas WD was shady < semi-shape < sunny slope aspects and there were also significant differences between shady and sunny and semi-shady and sunny slope aspects. TP and AP were less both the shady and semi-shady areas of the slope,whereas SOM,TK and AK were higher in shady and semi-shady areas of the slope. Simple regression analyses between plant functional traits and soil factors indicated that SLA was mainly affacted by SOM and showed a significant negetive changing pattern along the shady and semi-shady slope aspects; CC was significantly positively correlated with TP and AK in shady areas of the slopes while there was no significant correlation between WD and five environmental factors along the slope aspects. That community level plant functional traits change along the slope aspects reflected the environmental filtering effects in rebuilding process of vegetation community in karst hills of Guilin.
In this study,we measured three plant functional traits( SLA,specific leaf area; CC,leaf total chlorophyll content; WD,wood density) and five environmental factors among different plant communities in karst hills of Guilin to explore the relationship between plant functional traits and environmental factors along the slope( shady,semi-shady,sunny) aspects. The results showed that SLA and CC showed a consistent changing pattern,that is,shady>semi-shape>sunny slope aspects,and significant differences were found between shady and sunny and semi-shady and sunny slope aspects. Whereas WD was shady < semi-shape < sunny slope aspects and there were also significant differences between shady and sunny and semi-shady and sunny slope aspects. TP and AP were less both the shady and semi-shady areas of the slope,whereas SOM,TK and AK were higher in shady and semi-shady areas of the slope. Simple regression analyses between plant functional traits and soil factors indicated that SLA was mainly affacted by SOM and showed a significant negetive changing pattern along the shady and semi-shady slope aspects; CC was significantly positively correlated with TP and AK in shady areas of the slopes while there was no significant correlation between WD and five environmental factors along the slope aspects. That community level plant functional traits change along the slope aspects reflected the environmental filtering effects in rebuilding process of vegetation community in karst hills of Guilin.
引文
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