Jackson Stephen T, Smith Susan J
Department of Biological Sciences, Northern Arizona University, Flagstaff, AZ 86011-5640, USA.
Bilby Research Center, Northern Arizona University, Flagstaff, AZ 86011-5640, USA.
New Phytol. 1994 Sep;128(1):181-193. doi: 10.1111/j.1469-8137.1994.tb04001.x.
Modern pollen assemblages from 18 small ponds and wetlands on the spatially isolated and forested Kaibab Plateau were studied to determine how the pollen assemblages recorded vegetation patterns. Vegetation of the Plateau consists of an inner core of subalpine Picca/Abies forests, surrounded by mixed Abies/Picea/ Pseudotsuga/Pinus ponderosa forests, which are in turn surrounded by extensive Pinus ponderosa forests. The flanks of the Plateau are vegetated by Pinus edulis/Juniperus woodlands, with scattered Quercus populations. Arboreal pollen assemblages were dominated by Pinus (70-98 %), which was most abundant in the P. ponderosa forests. Picea, Abies, Pseudotsuga and Populus pollen were abundant only at sites in the mixed and subalpine conifer forests, where their combined abundance never exceeded 16% except at the site deepest in the subalpine forest (22%). Pollen percentages of Cupressaceae and Pinus Subsection Cembroides were highest in the outermost P. ponderosa forests (nearest the P. edulis/Juniperus woodlands) and in the mixed and subalpine conifer forests, where Quercus pollen was also highest. Percentage representation of the well-dispersed pollen of Quercus, Cupressaceae and Pinus Subsect. Cembroides was amplified at these latter sites by the poor pollen representation of the dominant Picca, Abies and Pseudotsuga trees. This effect is similar to that recorded in many pollen assemblages from arctic and alpine tundra regions.
对空间隔离且森林覆盖的凯巴布高原上18个小池塘和湿地的现代花粉组合进行了研究，以确定花粉组合如何记录植被模式。该高原的植被由亚高山云杉/冷杉森林的内核组成，周围环绕着冷杉/云杉/黄杉/西黄松混交林，而混交林又被广阔的西黄松森林所环绕。高原的边缘生长着矮松/杜松林地，并散布着栎属种群。木本花粉组合以松属为主（占70 - 98%），在西黄松森林中最为丰富。云杉、冷杉、黄杉和杨属花粉仅在混交林和亚高山针叶林的地点丰富，在这些地方，它们的总丰度除了在亚高山森林最深处的地点（22%）外，从未超过16%。柏科和单维管束松亚组的花粉百分比在最外层的西黄松森林（最靠近矮松/杜松林地）以及混交林和亚高山针叶林中最高，在这些地方栎属花粉也最高。在这些后一类地点，由于优势种云杉、冷杉和黄杉的花粉代表性较差，栎属、柏科和单维管束松亚组的易于扩散的花粉的百分比代表性得到了增强。这种效应与在北极和高山冻原地区的许多花粉组合中记录的效应相似。
