Direct VA mycorrhizal inoculation of colonizing plants by pocket gophers (Thomomys talpoides) on Mount St. Helens.
Direct VA mycorrhizal inoculation of colonizing plants by pocket gophers (Thomomys talpoides) on Mount St. Helens.
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圣海伦斯火山上的袖珍地鼠 (Thomomys talpoides) 对定植植物进行直接 VA 菌根接种。
DOI：
10.1080/00275514.1988.12025615
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发表时间：
1988
期刊：
影响因子：
2.8
通讯作者：
J. Macmahon
中科院分区：
文献类型：
--
作者：
M. Allen;J. Macmahon
随机事件创造和调节了群落间的植被格局(格里森，1926)。从蚂蚁丘到灾难性火灾的干扰在时间和空间上都是不可预测的，并通过以干扰因素控制的模式启动演替来改变受影响的群落(例如，Loucks等人，1985)。通常，这些扰动过程是众所周知的(Pickett和White，1985)。相比之下，促进个体种子传播等促进演替的事件可能也同样重要，但很少有文献记载。演替可以由稀有丰度的生物体来调节(MacMahon，1981)。作为对这些小规模过程的响应，随着演替的进行，看起来在干扰后立即相当一致的地貌可能会形成不同的斑块。通常，触发这些模式发展的特定事件序列是未知的。1980年火山喷发造成的华盛顿州圣海伦斯火山爆炸区域是一个独特的机会，可以尝试描述规范社区恢复的事件。喷发的一个结果是，许多地区广泛覆盖着无菌的火山灰物质(通常超过20米)，没有幸存的植被。因此，从视觉上看，风景看起来相当一致。到1982年，成片的羽扇豆属羽扇豆属(Lupinus Lepdus Dougl.)出现在这些地区。其中一些斑块幸存下来，被不同种类的植被斑块取代(例如，Franklin等人，1985年)。其他植物没有存活下来，它们最初生长的地区后来也没有被殖民。在这里，我们提供一些数据来描述一些事件，这些事件可能解释其中一些补丁的差异生存。
Stochastic events create and regulate the patterns of vegetation across communities (Gleason, 1926). Disturbances that range from ant mounds to catastrophic fires are unpredictable both in time and space and alter the affected communities by initiating succession in patterns that are controlled by the disturbing agent (e.g., Loucks et al., 1985). Often these disturbance processes are well known (Pickett and White, 1985). By contrast, events that promote succession such as dispersal of individual seeds might be just as important but are rarely documented. Succession can be regulated by organisms with infrequent abundance (MacMahon, 1981). In response to these small-scale processes, landscapes that appear to be quite uniform immediately following disturbance may form distinct patches as succession proceeds. Frequently, the particular sequence of events that trigger the development of these patterns is unknown. The blast area of Mount St. Helens, Washington, caused by the 1980 volcanic eruption, represented a unique opportunity to attempt to describe events regulating community recovery. One result of the eruption was that many areas were covered extensively with sterile tephra material (often greater than 20 m) with no surviving vegetation. Thus, visually, the landscape appeared quite uniform. By 1982, patches of lupines (Lupinus lepidus Dougl.) appeared in these areas. Some of these patches survived, being replaced, in turn, by patches of diverse vegetation (e.g., Franklin et al., 1985). Other plants did not survive and the areas where they initially grew were not subsequently colonized. Here we present data to describe some events that might explain the differential survival of some of these patches.