SUCCESSIONAL STATUS, SEED SIZE, AND RESPONSES OF TREE SEEDLINGS TO CO2, LIGHT, AND NUTRIENTS
SUCCESSIONAL STATUS, SEED SIZE, AND RESPONSES OF TREE SEEDLINGS TO CO2, LIGHT, AND NUTRIENTS
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DOI：
10.2307/1939505
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发表时间：
1993-01-01
期刊：
影响因子：
4.8
通讯作者：
MIAO, SL
中科院分区：
文献类型：
--
作者：
BAZZAZ, FA;MIAO, SL
我们研究了如何丰富的CO2大气中的光和营养物质的完全交叉设计，影响第一年的幼苗生长在6个新英格兰落叶林树种。耐荫性依次为灰桦（Betula populifolia）、白蜡（Fraxinus americana L.）红枫（Acer rubrum L.），红橡木（Quercus rubra L.），黄桦（Betula alleghaniensis布里顿）和条纹枫树（Acerpeneticum）。CO2浓度升高的环境显着刺激所有六个物种的幼苗生长。一般来说，这在弱光下更明显。低光高营养条件下的刺激作用最大。然而，个别物种对CO2水平升高的反应不同。在三个早期演替的物种，灰桦树，灰，红枫，幼苗生长在CO2浓度升高的条件下显着增加，发现只有高营养。在二氧化碳浓度升高的条件下生长的三种后期演替物种（红橡、黄桦和条纹枫）在弱光下的幼苗生长百分比比在强光下增加得更大。因此，对于早期演替的物种，提高CO2水平的幼苗生长的增强程度是更敏感的营养水平，而在后期演替的物种的增强是更敏感的光的水平。此外，具有大种子的物种（例如，红橡树）在低光下比具有小种子的物种（例如，这些结果强调了植物物种以及其他环境资源在改变植物对CO2浓度升高的反应中的重要性。考虑到在不同大小的林隙中观察到的光和营养环境，本实验的结果表明，幼苗更新在新英格兰落叶林可能会改变在未来的高CO2环境。
We studied how an enriched CO2 atmosphere in a fully crossed design of light and nutrients, influenced 1 st-yr seedling growth in six New England deciduous forest tree species. The species, in the order of increasing shade tolerance, were gray birch (Betula populifolia), ash (Fraxinus americana L.), red maple (Acer rubrum L.), red oak (Quercus rubra L.), yellow birch (Betula alleghaniensis Britton), and striped maple (Acerpensylvanicum). Elevated CO2 environments significantly stimulated the seedling growth of all six species. Generally this was more pronounced in low light. The greatest stimulation was found under the condition of low light and high nutrients. However, individual species responded differently to elevated CO2 levels. Among the three early-successional species, gray birch, ash, and red maple, a significant increase in seedling growth under elevated CO2 conditions was found only with high nutrients. The three late-successional species grown under elevated CO2 conditions (red oak, yellow birch, and striped maple) showed a greater percentage increase in seedling growth in low light than in high light. Thus, for the early-successional species, the degree of enhancement of seedling growth by elevated CO2 levels was more sensitive to nutrient levels, while in the late-successional species the enhancement was more sensitive to the level of light. Moreover, species with large seeds (e.g., red oak) exhibited a greater response to elevated CO2 levels under low light than species with small seeds (e.g., gray birch).The results emphasize the importance of plant species as well as other environmental resources in modifying the response of plants to elevated CO2. Considering the light and nutrient environment observed in forest gaps of various sizes, the results of the present experiment suggest seedling regeneration in New England deciduous forests may be altered in a future high CO2 environment.