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| 桉树人工林更新方式对林下植物功能群的影响 |
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尤业明1,2,3, 陈永康1,2,3, 朱宏光1,2,3, 刘 通1,2,3, 温远光1,2,3, 黄雪蔓1,2,3*
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1. 广西大学 林学院 广西森林生态与保育重点实验室, 南宁530004;2. 广西大学 亚热带农业生物资源保护与
利用国家重点实验室, 南宁 530004;3. 广西友谊关森林生态系统定位观测研究站, 广西 凭祥 532600
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| 摘要: |
| 该研究综合运用野外调查和室内分析的方法,评估桉树人工林林下植物功能群的组成、分布及更新方式和相关环境因子之间的关系。结果表明:林分更新5 a后,除了非禾本科杂草功能群外,其他林下植物功能群的物种丰富度均呈现不同程度的增加,但与对照组(砍伐迹地)相比,其差异程度均不显著(P>0.05); 与对照组相比,藤本和蕨类功能群的相对多度也出现增加趋势,但禾本科草本功能群显著减少(P< 0.05); 木本、藤本和蕨类功能群的相对盖度也呈现增加趋势,但禾本科草本功能群与对照组相比显著减少(P< 0.05); 主成分分析(PCA)发现萌芽更新或植苗更新林的林下植物功能群组成和分布与对照组相比均发生了显著的变异,但不同更新方式(萌芽和植苗)下其林下植物功能群组成和分布差异不明显; 通过冗余分析(RDA)确定了冠层透光系数、土壤孔隙度、坡向和土壤氮磷比是影响该林地林下植物功能群的主要因子,它们的叠加效应能解释大于75%的林下植物功能群的变异,最终模型通过排序得到冠层透光系数是影响该林地林下植物功能群的最主要因子。短期的研究发现萌芽和植苗这两种不同的更新方式对桉树林下植物功能群的影响有限,这可能与这两种更新方式形成的林冠结构和土壤理化性质差异性较小有关。 |
| 关键词: 桉树人工林, 更新方式, 植物功能群, 物种丰富度, 冗余分析(RDA) |
| DOI：10.11931/guihaia.gxzw201801013 |
| 分类号:Q948.11, S719 |
| 文章编号:1000-3142(2019)01-0126-10 |
| Fund project:国家自然科学基金(31560201); 广西自然科学基金(2015GXNSFBA139111,2016GXNSFBA380222); 广西高等学校重大科研项目(201201ZD001)[Supported by the National Natural Science Foundation of China(31560201); Guangxi Natural Science Foundation(2015GXNSFBA139111, 2016GXNSFBA380222); Major Scientific Research Program of Guangxi Colleges and Universities(201201ZD001)]。 |
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| Effects of different regeneration modes on understory plant functional group in Eucalyptus plantations |
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YOU Yeming1,2,3, CHEN Yongkang1,2,3, ZHU Hongguang1,2,3, LIU Tong1,2,3,
WEN Yuanguang1,2,3, HUANG Xueman1,2,3*
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1. Guangxi Key Laboratory of Forest Ecology and Conservation, College of Forestry, Guangxi University, Nanning 530004, China;2. State
Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangxi University, Nanning 530004, China;3. Guangxi Youyiguang Forest Ecosystem Research Station, Pingxiang 532600, Guangxi, China
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| Abstract: |
| We evaluated the relationships between composition, distribution and regeneration modes of understory plant functional groups and environmental factors, through the combination methods of field investigation and analyzed experimental to elucidate the changing rules of understory plant functional group in two different regenerated Eucalyptus plantations and the related influencing factors. Our results indicated that the species richness of understory plant functional groups in forest generated after five years increased but not significantly(P>0.05)compared to control plots(cut-over land)except for forbs. The 5-year forest regeneration caused increasing of relative abundance of vines and ferns, but that of grass was significantly decreased(P<0.05). The relative coverage had a great resemblance to relative abundance, which exhibited increasing in woody plants, vines and ferns in 5-year regeneration forest, but decreasing in grass(P<0.05). Principal component analysis(PCA)showed that the composition and distribution of understory plant functional groups significantly changed in sprouting regeneration forest and planting regeneration forest compared to control plots. Redundancy analysis(RDA)revealed that canopy light transmittance, slope aspect, soil porosity and N/P ratios were key factors in regulating plant functional groups in Eucalyptus plantations, and the accumulative effects explained more than 75.0% of total variations in understory plant functional groups. The sequencing mode analysis suggested that canopy light transmittance was the most significant factor in affecting understory plant functional groups in Eucalyptus plantations. We found in short-term studies that sprouting and planting regeneration had limited effects on the understory plant functional groups in Eucalyptus plantations, and which may be caused by similar canopy structure and soil physicochemical properties. |
| Key words: Eucalyptus plantation, regeneration mode, plant functional groups, species richness, redundant analysis(RDA) |
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