Palynological Evidence for Early Holocene Aridity in the Southern Sierra Nevada, California
Palynological Evidence for Early Holocene Aridity in the Southern Sierra Nevada, California
复制标题
加利福尼亚州内华达山脉南部全新世早期干旱的孢粉学证据
DOI：
10.1016/0033-5894(85)90054-7
复制
发表时间：
1985
影响因子：
2.3
通讯作者：
R. S. Thompson
中科院分区：
文献类型：
--
作者：
O. Davis;R. Scott Anderson;Patricia L. Fall;M. K. O'Rourke;R. S. Thompson
Balsam Meadow的沉积物产生了加州南部内华达州山脉11,000年的花粉记录。Balsam Meadow图分为三个区域。(1)Artemisia带（11，000 -7000年B. P.）其特点是山艾属植物（蒿属）和其他非树木花粉的百分比高于现代当地植被。这一时期的植被可能与内华达州山脉东坡的现代植被相似，气候比今天干燥。(2)松属花粉在7000 ~ 3000年B. P.的含量超过80%。当时的气候比蒿属地区的气候要潮湿。(3)冷杉（冷杉，柏科，橡树）的百分比增加后3000年B. P.在冷杉带的现代植被的网站开发和目前的冷湿气候制度的建立。1200年B. P.后火灾频率下降反映在宏观木炭丰度下降和浓度增加的冷杉和松murrayana针。
Sediments of Balsam Meadow have produced a 11,000-yr pollen record from the southern Sierra Nevada of California. The Balsam Meadow diagram is divided into three zones. (1) The Artemisia zone (11,000–7000 yr B.P.) is characterized by percentages of sagebrush (Artemisia) and other nonarboreal pollen higher than can be found in the modern local vegetation. Vegetation during this interval was probably similar to the modern vegetation on the east slope of the Sierra Nevada and the climate was drier than that of today. (2) Pinus pollen exceeded 80% from 7000 to 3000 yr B.P. in the Pinus zone. The climate was moister than during the Artemisia zone. (3) Fir (Abies, Cupressaceae, and oak (Quercus) percentages increased after 3000 yr B.P. in the Abies zone as the modern vegetation at the site developed and the present cool-moist climatic regime was established. Decreased fire frequency after 1200 yr B.P. is reflected in decreased abundance of macroscopic charcoal and increased concentration of Abies magnifica and Pinus murrayana needles.