Separate effects of human visitation and touch on plant growth and herbivory in an old-field community.
Separate effects of human visitation and touch on plant growth and herbivory in an old-field community.
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人类访问和接触对老田群落中植物生长和食草的单独影响。
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
B. Casper
中科院分区：
文献类型：
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作者：
J. Cahill;J. Castelli;B. Casper
虽然动物科学家早就意识到用于测量实验系统的方法会影响测量对象，但植物生态学家直到最近才承认常用的野外方法的类似混淆效应。在这里，我们展示了显着的影响，每周访问（走到一个焦点植物）和处理（采取形态措施）对植物生长和植食动物在一个老领域的社会。在所检查的三个物种中，罗布麻是受我们的治疗影响最严重的。对于罗布麻，每周访问导致初始和最终大小之间的正相关关系，这并没有发生在未访问的植物。访问也增加了叶草食动物，导致叶：茎生物量比降低。处理植物几乎增加了一倍的比例，个人与茎螟出现洞。在这项研究中，其他物种的生长，委陵菜和飞蓬philadelphicus，改变了访问或访问加处理。为了观察植物而访问植物，并在进行形态测量时触摸它们，可以产生重要的生物学后果。我们建议植物生态学家把重复进入自然系统作为一种研究方法，像所有其他实验方法一样受到同样的审查和证明。
Although animal scientists have long been aware that methods used to measure an experimental system can affect the subject of measurement, similar confounding effects of commonly used field methods have only recently been acknowledged by plant ecologists. Here we demonstrate significant effects of weekly visitation (walking up to a focal plant) and handling (taking morphological measures) on plant growth and herbivory in an old-field community. Of the three species examined, Apocynum cannabinum was the most severely affected by our treatments. For Apocynum, weekly visitations resulted in a positive relationship between initial and final size, which did not occur in the unvisited plants. Visitation also increased leaf herbivory, resulting in a reduced leaf:stem biomass ratio. Handling the plants nearly doubled the proportion of individuals with a stem borer emergence hole. Growth of the other species in this study, Potentilla recta and Erigeron philadelphicus, was altered by either visitation or visitation plus handling. Visiting plants in order to observe them and touching them as one would when making morphological measurements can have important biological consequences. We suggest that plant ecologists treat repeated entry into a natural system as a research method, subject to the same scrutiny and justification as all other experimental methods.