Paleoenvironmental information recorded by pollen in B-3GC gravity core in Okinawa Trough |
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Authors: | Changqing Song Xiangjun Sun Saito Yoshiki |
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Institution: | (1) National Natural Science Foundation of China, 100085 Beijing, China;(2) Open Lab of Marine Geology, Tongji University, 200039 Shanghai, China;(3) Institute of Botany, Chinese Academy of Sciences, 100093 Beijing, China;(4) Geological Survey of Japan, Higashi 1-1-3, Tsukuba, 305-8567 Ibaraki, Japan |
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Abstract: | Based on pollen records in B-3GC gravity core, environmental change since 9500 aBP of Okinawa Trough and its adjacent islands
was derived. The result showed that the most time during this period was in a warm temperate climate except in middle Holocene
(6800-4400 aBP) that was under subtropical climate control. During 9500–8300 aBP and 3100–2000 aBP periods, it appeared colder
and drier than the rest time. The original area of pollen sources surrounding Okinawa Trough was covered by evergreen and
deciduous broadleaf forest alternatively with mixed broad-leaf-conifer forest distributed in high mountainous areas. Usually,
these three kinds of forests existed at the same time with difference in altitude. Pollen from subtropical and tropical plants
increased obviously in about 5000–6000 aBP, reflecting a great lifting of vegetation zone and expansion of evergreen broad-leaf
forest in the study area. However, there was a slight descending of plant zone and shrinking of evergreen broadleaf forest
during 9500-8300 aBP and 3000-2000 aBP. During the remaining periods vegetation zone was higher than the present but in a
limited range. |
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Keywords: | environmental change Holocene pollen Okinawa Trough |
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