Responses of four succession tree species in low subtropics to enhanced UV-B radiation in the field
Responses of four succession tree species in low subtropics to enhanced UV-B radiation in the field
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DOI：
10.1007/s11099-008-0084-y
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发表时间：
2008-12
期刊：
影响因子：
2.7
通讯作者：
X. Cai;S. Peng;H. Xia;P. Zhao;F. Mason
中科院分区：
文献类型：
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作者：
X. Cai;S. Peng;H. Xia;P. Zhao;F. Mason
试验树种包括发生在亚热带森林群落的先锋树种马金相思、演替早期树种超级中国槐、中游植物演替中期树种中国马柳木和耐阴植物或演替后期树种中国隐树。与当前环境UV-B辐射水平（UV-B）比较，4种植物叶片净光合速率（PN）、蒸腾速率(E)和气孔导度（gs）变化范围从显著降低到无显著变化。UV-B增强后，4种树种叶片栅栏厚度和叶肉厚度均显著降低。除形态外，叶片海绵薄壁组织厚度均减少。对。UV-B增加了a的叶宽。但其叶长、叶厚和单位面积干质量不受影响。气孔宽度显著增加。UV-B对芒果叶表皮的影响。叶片背面表皮气孔宽度显著降低，气孔密度显著增加。中国人也被观察到了。植物下表皮气孔密度。增强的UV-B显著提高了胆红素含量。a的高度和分枝生物量。和s的高度。增强UV-B可明显减少超裸。通过聚类分析，4种植物对UV-B的敏感性可分为3类。锰对UV-B增强敏感；conconner表现出更强的忍耐力。
The tested tree species included pioneer speciesAcacia mangium, early succession stage speciesSchima superba, mesophyte intermediate-succession speciesMachilus chinensis, and shade-tolerant plant or late-succession speciesCryptocarya concinnawhich occur in the lower subtropical forest community. A comparison with the current ambient level of UV-B radiation (UV-B) showed the leaf net photosynthetic rate (PN), transpiration rate (E), and stomatal conductance (gs) of the four species ranged from significantly decreased to no significant change. Additionally, the thickness of palisade and mesophyll in leaves of four tree species were decreased sharply by enhanced UV-B. The thickness of spongy parenchyma in leaves was also decreased except forM. chinensis. UV-B increased the leaf width ofA. mangiumbut its leaf length, leaf thickness, and dry mass per unit area were not affected. Significantly increased stomata width was observed inA. mangiumleaf epidermis in response to UV-B. Significantly decreased stomata width and significantly increased stomata density of leaf abaxial epidermis inM. chinensiswere also observed. The stomata density of abaxial epidermis ofC. concinnawas remarkably increased by enhanced UV-B. The height and branch biomass ofA. mangiumand the height ofS. superbawere reduced visibly by enhanced UV-B. The four plant species could be classified into three groups of UV-B sensitiveness by hierarchical cluster analysis.A. mangiumwas sensitive to enhanced UV-B, whileC. concinnashowed more tolerance.