. Indagini ecologiche della tundra biome in Prudhoe Bay regione, Alaska. La tundra ecologia. 85. Tipo3 vegetazione di Carex aquatilis, Eriophorum angustifolium, Dryas integrifoliaa^7o'sei/SER/ Salix specie. La seguente chiave dicotomica, che si basa sulla pianta piuttosto "di geomorfologia habitat o parametri, illustra la semplicità del procedimento di identificazione: chiave per i più comuni tipi di vegetazione di Prudhoe Bay area 1. I licheni abbondanti ^â ¢ Licheni rare â ¢ â 2. Molti fruticose e crosta di licheni . Digitare 1 per la maggior parte dei licheni fruticose Tipo 2 3. Dryas e/o Salix spp. abbondanti . T

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. Ecological investigations of the tundra biome in the Prudhoe Bay region, Alaska. Tundra ecology. 85. Type3 vegetation of Carex aquatilis, Eriophorum angustifolium, Dryas integrifoliaa^7o'sei/era/ Salix species. The following dichotomous key, which is based on plant rather "than geomorphic or habitat parameters, illustrates the simplicity of the identification process: Key to the most common vegetation types of the Prudhoe Bay area 1. Lichens abundant ^⢠Lichens rare â¢'â 2. Many fruticose and crust lichens . Type 1 Mostly fruticose lichens Type 2 3. Dryas and/or Salix spp. abundant . Type 3 Dryas and/or Salix spp. rare ^ 4. Mosses rare Type 6 Mosses abundant ^⢠5. Drepanocladus species dominant . Type 4 Scorpidium dominant Type 5 We plan to develop a key to all vegetation types. Other functional keys using a variety of para- meters could be made, but we want to avoid mixing descriptors to reduce the problem of circular reasoning when maps are subsequently analyzed and used. Nevertheless, vegetation, habitat, and geomorphology are intimately inter- related, and it is difficult to map them separate- ly at this scale (1:3, 000) because of the fine mosaic and patterning of this tundra. But we believe our method will allow a separate analy- sis. We have set up and sampled a number of permanent vegetation plots in both disturbed and undisturbed areas. These plots will serve as baselines for any subsequent changes. We have also set up specimen plots of each vegetation type which can serve as training and reference samples for other potential vegetation users or mappers; these will also serve as permanent baseline plots. Mapping Method The maps were initially constructed in the laboratory using July 1972 CRREL, 1:3, 000, black-and-white, air photographs on which major landscape units were then outlined. These units were identified on the basis of uniform tone, texture, and pattern. Each of these units was visited in the field, their boundaries checked and chan

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• bookcentury1900
• bookcollectionbiodiversity
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