Does clonal integration improve competitive ability?: A test using aspen (Populus tremuloides [Salicaceae]) invasion into prairie
Does clonal integration improve competitive ability?: A test using aspen (Populus tremuloides [Salicaceae]) invasion into prairie
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DOI：
10.3732/ajb.89.3.494
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发表时间：
2002-03-01
影响因子：
3
通讯作者：
Peltzer, DA
中科院分区：
文献类型：
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作者：
Peltzer, DA
许多克隆植物由许多相连的分株组成。分株间的整合还可以提高克隆植物对非生物胁迫的耐受能力或提高单个分株的竞争能力。在这里，我用一个现场实验，以确定是否克隆整合提高分株的性能，广泛的克隆树种入侵到原生草原。白杨（Populus tremuloides）在加拿大西部的南部林线中占主导地位，在母亲和女儿分株之间具有长寿命的地下连接，并且在干扰后通过重新发芽的根茎繁殖植被。我用了两种竞争疗法（邻居存在或不存在）和两个克隆整合处理（母株和子株之间的地下根状茎被切断或保持完整）对三个地点的12个复制杨子株进行邻居在2年后将杨子株的存活率提高了25-35%，但生长下降了接近20%克隆整合倾向于提高分株的存活率和生长。但这些趋势往往不显著，克隆整合并没有改变相邻植被竞争的影响，这表明分株之间的连接并不一定会提高杨树入侵原生草原的竞争能力。
Many clonal plants consist of many connected individual ramets. allowing them to share water and nutrients via physiological integration Integration among ramets may also improve the ability of clonal plants to tolerate abiotic stress or improve the competitive ability of individual ramets. Here I use a field experiment to determine whether clonal integration improves ramet performance for a widespread clonal tree species invading into native prairie. Aspen (Populus tremuloides) dominates the southern treeline in western Canada, has long-lived belowground connections between mother and daughter ramets, and reproduces vegetatively via resprouting rhizomes after disturbance. I applied two competition treatments (neighbors present or absent) and two clonal integration treatments (belowground rhizomes between mother and daughter ramets either severed or left intact) to 12 replicate Populus daughter ramets at each of three sites Neighbors improved the survivorship of Populus ramets by 25-35% after 2 yr, but decreased growth by similar to20% Clonal integration tended to improve ramet survival and growth. but these trends were often not significant Clonal integration did not alter the effects of competition from neighboring vegetation, suggesting that connections between ramets do not necessarily improve the competitive ability of Populus, invading into native prairie.