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Vegetation and climate change in Mia...

Jarvis, Devra Ivy.

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Vegetation and climate change in Mianning County, southwestern Sichuan Province, China.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Vegetation and climate change in Mianning County, southwestern Sichuan Province, China./
Author:	Jarvis, Devra Ivy.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 1993,
Description:	254 p.
Notes:	Source: Dissertation Abstracts International, Volume: 54-08, Section: B, page: 4054.
Contained By:	Dissertation Abstracts International54-08B.
Subject:	Paleoecology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9401439

Vegetation and climate change in Mianning County, southwestern Sichuan Province, China.
Jarvis, Devra Ivy.

Vegetation and climate change in Mianning County, southwestern Sichuan Province, China. - Ann Arbor : ProQuest Dissertations & Theses, 1993 - 254 p.

Source: Dissertation Abstracts International, Volume: 54-08, Section: B, page: 4054.

Thesis (Ph.D.)--University of Washington, 1993.

Late Quaternary vegetational and climatic changes, interpreted from pollen records at mid-elevations in southwestern Sichuan Province, China, give a picture of prehistoric landscapes. From 11,000 to 10,000 yr B.P., Betula and deciduous oak taxa, indicating a cold and dry climate, dominated the pollen rain. Between 10,000 and 9100 yr B.P., Cedrus, Abies, Tsuga, and mesic deciduous taxa increased in abundance, suggesting wetter climatic conditions than earlier. From 9100 to 7800 yr B.P., Tsuga increased, the pollen of mesic deciduous taxa became more abundant, and evergreen oaks increased at the expense of deciduous oaks, indicating a change to warmer and wetter climatic conditions. From 7800 to 4000 yr B.P., pollen of sclerophyllous evergreen taxa increased relative to pollen of mesic deciduous taxa, an indication that rainfall distribution was becoming more seasonal. By 4000 yr B.P. sclerophyllous evergreen taxa dominated the vegetation indicating a climate with a severe spring drought that is characteristic of the region today. At about 1000 yr B.P., disturbance types became obvious in the pollen rain probably due to increased human activities. Extrapolations from NCAR CCM simulations are in general agreement with the climate changes inferred from the Lake Shayema pollen record. The spatial and temporal resolution of model simulations, however, is insufficient to register a weakening of the monsoon system at about 7000 yr B.P. as recorded by the pollen record.Subjects--Topical Terms:

608789
Paleoecology.

Vegetation and climate change in Mianning County, southwestern Sichuan Province, China.
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245 1 0 $a Vegetation and climate change in Mianning County, southwestern Sichuan Province, China.
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300 $a 254 p.
500 $a Source: Dissertation Abstracts International, Volume: 54-08, Section: B, page: 4054.
500 $a Chairperson: Estella B. Leopold.
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520 $a Late Quaternary vegetational and climatic changes, interpreted from pollen records at mid-elevations in southwestern Sichuan Province, China, give a picture of prehistoric landscapes. From 11,000 to 10,000 yr B.P., Betula and deciduous oak taxa, indicating a cold and dry climate, dominated the pollen rain. Between 10,000 and 9100 yr B.P., Cedrus, Abies, Tsuga, and mesic deciduous taxa increased in abundance, suggesting wetter climatic conditions than earlier. From 9100 to 7800 yr B.P., Tsuga increased, the pollen of mesic deciduous taxa became more abundant, and evergreen oaks increased at the expense of deciduous oaks, indicating a change to warmer and wetter climatic conditions. From 7800 to 4000 yr B.P., pollen of sclerophyllous evergreen taxa increased relative to pollen of mesic deciduous taxa, an indication that rainfall distribution was becoming more seasonal. By 4000 yr B.P. sclerophyllous evergreen taxa dominated the vegetation indicating a climate with a severe spring drought that is characteristic of the region today. At about 1000 yr B.P., disturbance types became obvious in the pollen rain probably due to increased human activities. Extrapolations from NCAR CCM simulations are in general agreement with the climate changes inferred from the Lake Shayema pollen record. The spatial and temporal resolution of model simulations, however, is insufficient to register a weakening of the monsoon system at about 7000 yr B.P. as recorded by the pollen record.
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650 4 $a Ecology. $3 516476
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