Microhabitat Selection and the Successional Gradient of a Forest Grass
Microhabitat Selection and the Successional Gradient of a Forest Grass
复制标题
林草的微生境选择和演替梯度
作者：
S. Scheiner;J. A. Teeri
次生林演替涉及森林地面环境的巨大变化。人口的Danthonia spicata发生在网站代表一个70年的继承跨度火灾后，在下密歇根州北方的白杨松林。五个种群进行了研究，从网站的年龄0，26，32，44，和69年火灾后。四个种群位于被砍伐和烧毁的地点;一个种群位于自然烧毁的地点。在网站的环境测量结果显示，光，土壤水分和土壤养分方面存在很大的差异。我们调查了微生境选择在多大程度上是持久性的D。在70年的演替梯度中，穗花针茅的分布最为均匀。在三个地点，D.穗花植物种群所处的位置的平均光照水平高于该地点的平均值。在3周的无雨期内，观察到四个实验烧伤地点的植物发生在平均土壤水势低于平均土壤水势的地点。
Secondary forest succession involves large changes in the environment of the forest floor. Populations of Danthonia spicata occur in sites representing a 70-year span of succession following fire in the aspen–pine forests of northern lower Michigan. Five populations were studied from sites of ages 0, 26, 32, 44, and 69 years after fire. Four populations were in sites that were clear-cut and burned; one population occurred on the site of a natural burn. Environmental measurements in the sites revealed large differences with respect to light, soil water, and soil nutrients. We investigated the extent to which microhabitat selection was responsible for the persistence of D. spicata across the 70-year successional gradient. On three sites the D. spicata populations were in locations with a higher mean light level than the mean value for the site. During a 3-week period of no rain the plants in the four experimental burn sites were observed to occur in locations with a lower mean soil water potential than the ...