A Mapping Table for Obtaining Plant Population Data

Abstract

Researchers and managers aliie are placing greater emphasis on understanding the life history characteristics of plants. Basic demographic data, including patterns of recruitment, reproduction, and survival, are central to understanding plant population dynamics. Such information, in combination with the proper correlative data, allows prediction of changes in plant populations in response to environment, competition, herbivory, or other factors (Schalll984). Applied uses of these data are many and varied. For example, acquiring detailed life history information on rare and endangered plants can help managers devise strategies for insuring their preservation. Mapping tables are routinely used for collecting plant demographicdata (Moore and Chapman 1986, Mackand Pyke 1983, Mack and Harper 1977), but seldom is detailed methodology presented. We describe the construction and use of an acrylic mapping table designed for obtaining basic demographic information from plant populations. Our primary objective was to design and construct a table that would allow accurate and precise relocation of mapping quadrats and plants using acetate sheets as “maps.” The table differs slightly from others that have been described: (1) It was designed so that permanent mapping quadrats were relocated from the positions of permanent corner stakes marked on acetate sheets, rather than from fitting table legs over permanently set stakes. This eliminates the necessity of precise stake locations which is often impossible in rocky soils. (2) The table was built with easy-toadjust legs so that its surface could be quickly leveled on uneven