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| 四种热带雨林树种幼苗比叶重,光合特性和暗呼吸对生长光环境的适应 | |
| 引用本文： | 冯玉龙,曹坤芳,冯志立,马玲.四种热带雨林树种幼苗比叶重,光合特性和暗呼吸对生长光环境的适应[J].生态学报,2002,22(6):901-910. |
| 作者姓名： | 冯玉龙 曹坤芳 冯志立 马玲 |
| 作者单位： | 1. 中国科学院西双版纳热带植物园昆明分部,昆明,650223河北大学生命科学学院,保定,071002 2. 中国科学院西双版纳热带植物园昆明分部,昆明,650223 3. 东北林业大学森林资源与环境学院,哈尔滨,150040 |
| 基金项目： | 中国科学院“百人计划”资助项目 |
| 摘 要： | 雾凉季研究了西双版纳热带雨林4种植物幼苗对生长光环境的适应，其中两个树种幼苗喜光（团花和滇南插柚紫），两个树种幼苗耐荫（滇南红厚壳和玉蕊）发现弱光环境中生长的4种植物比叶重、光合能力、光饱和点、光补偿点暗呼吸速度、叶绿素a/b比较低，叶绿素含量较高。玉蕊和滇南红厚壳幼苗的光合能力和呼吸速度 于团花树和滇南插柚紫。团花树和滇南插机紫的比叶重和光合作用的可塑性大于玉蕊和滇南红厚壳。高光强下生长的团花树和滇南插机紫增加叶氮分配给羧化酶的比较。减少分配给叶绿素的比例。滇南红厚壳和玉蕊适应弱光环境的能力略强于团花树和滇南插机紫，但适应强光的能力较差。研究结果支持树种的生理生态特性决定了其演替状况和生境选择的假说，单位干重叶的光合能力和呼吸速率并未表现出利于光适应的可塑性，表明4种植物生理适应能力较差，形态学上的适应在4种热带雨林树种幼苗光适应方面起到了重要的作用，叶氮分配也是它们光适应的策略之一。 |
| 关 键 词： | 热带雨林树种 幼苗 叶重 光合特性 生长光环境 适应 光适应 暗呼吸 |
| 文章编号： | 1000-0933(2002)06-0901-10 |
| 收稿时间： | 2001/10/7 0:00:00 |
| 修稿时间： | 2002/3/22 0:00:00 |
Acclimation of Lamina Mass Per Unit Area, Photosynthetic Characteristics and Dark Respiration to Growth Light Regimes in Four Tropical Rainforest Species |
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| FENG Yulong,CAO Kunfang,FENG Zhili and MA Ling.Acclimation of Lamina Mass Per Unit Area, Photosynthetic Characteristics and Dark Respiration to Growth Light Regimes in Four Tropical Rainforest Species[J].Acta Ecologica Sinica,2002,22(6):901-910. | |
| Authors: | FENG Yulong CAO Kunfang FENG Zhili and MA Ling |
| Affiliation: | Kunming Division; Xishuangbanna Tropical Botanical Garden; Chinese Academy of Sciences; Kunming; China |
| Abstract: | The morphological and physiological acclimation to three growth light regimes were explored in seedlings of four tropical rainforest tree species during the foggy and cool season in 2000 at Xishuangbanna, Yunnan province, China. The main purpose was to determine whether plasticity of photosynthetic capacity and lamina mass per unit area (indicating leaf thickness) was greater in light-demanding species than that in shade-tolerant species, and to determine the relative importance of morphological and physiological acclimation. In seedling stage, the two species, Anthocephalus chinensis (Lam.) Rich.ex Walp. and Linociera insignis C. B. Clarke, are high light-demanding, and the two other species, Calophyllum polyanthum Wall. ex Choisy and Barringtonia macrostachya (Jack) Kurz, were shade-tolerant, according to the seedlings distribution of the four species in rainforest. The growth light regimes used in this study were 50%, 25%, and 8% of the full sunshine, respectively. The 50% relative irradiance is much stronger than that measured in tropical rainforest, and 25% and 8% relative irradiance correspond with those measured in very large and small forest gaps, respectively. The typical rainforest understory light intensity was not used in this study because high light-demanding species could not grow well at this weak light intensity. All the seedlings of the four species could acclimate to the low growth light regimes used in this study through decreasing lamina mass per unit area, lamina area based photosynthetic capacity and dark respiration rate, light saturation point, light compensation point, and chlorophyll a/b ratio, and through increasing lamina area based chlorophyll content. Lamina area based respiration rates and photosynthetic capacity of the two shade-tolerant species were lower than those of the two light-demanding species. The plasticity of photosynthetic capacity and lamina mass per unit area of the two light-demanders was higher than that of the two shade-tolerant. For the two light-demanders, with the growth light eregimes increasing lamina area based chlorophyll content decreased, and lamina area based and chlorophyll based carboxylation efficiency increased significantly. This means that the two light-demanders increased the allocation proportion of lamina nitrogen to Rubisco, while decreased the nitrogen allocation to chlorophyll. Compared with the two light-demanders, under the low growth light regimes the two shade-tolerant was higher in lamina area based chlorophyll content, and was lower in chlorophyll a/b ratio, lamina area based photosynthetic capacity and dark respiration rates, light saturation point, light compensation point, and the increment of their lamina area based photosynthetic capacity was not significant with the increase of growth light regimes. This indicates that the capacity of acclimation to low light regimes for the two shade-tolerant was stronger than that for the two light-demanders, but the capacity of acclimation to high light regimes of the shade-tolerant was poorer than the two light-demanders. Physiological acclimation to growth light regimes for the four tropical rainforest species was poor as judged by the decrease of lamina mass based photosynthetic capacity and dark respiration rate with the increase of growth light regimes, which did not show the favorable plasticity for light acclimation. The results above suggest that morphological plasticity is very important to acclimation to growth light regimes for the four tropical rainforest species, and that lamina nitrogen allocation pattern is one of the strategies of light acclimation, too. And also the results support the hypothesis that ecophysiological traits of tree species determines their successional status and their seedling preferred habitats. |
| Keywords: | light acclimation plasticity lamina mass per unit area photosynthetic characteristics dark respiration rate tropical rainforest species |
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