Study on Mire Development and Paleoenvironment Change since 8.0 ka B.P. in the Northern Part of the Sangjiang Plain
2003, 23 (1):
The paper makes relative high-resolution approach on the relationship among mire development, paleoenvironment change and human activity since 8.0 ka B.P. in the northern part of the Sanjiang plain. The model of the climate change can be reconstructed as high temperature period at 8000-5590 a B.P., warm period at 5590-1851 a B.P., slowly dropping period in temperature at 1851-1110 a B.P.,rapidly dropping period in temperature at 1110-649 a B.P., dropping in temperature and then warming period at 649-0 a B.P. The vegetation succession can be divided into five stages in proper corresponding period above-mentioned, i.e. temperate deciduous broad-leaved foreste, needle-broad-leaved mixed forest and grassland, needle-broad-leaved mixed forest dominated by deciduous broad-leaved trees and grassland, broad-leaved forest dominated by Betula, needle-broad-leaved mixed forest and needle-broad-leaved mixed forest dominated by Pinus and grassland. The close relationship was found between mire development and paleoenvironment change in the five periods in proper corresponding period above-mentioned in the given order, i.e.the breeding and germinating development of paludification process period, the vigorous development period, slow development and shriveling period, fluctuation period, shriveling period. On the whole, the mire has been in the stage of eutrophic mire stage. Although the environment changed frequently since 8.0 k a B.P., it was still favorable to the formation and development of eutrophic mire. The mire development and paleoenvironment change were mainly driven by nature environment factor, but the human activities gave a strong influence on them too. In 1851-1317a B.P., 649-309 a B.P. and 309 a B.P.-0, the mire was degraded by the human activities, i.e. agricultural production, deforestation and mire exploitation. The mire-profile of 30th team, Qindeli farm can be considered as the standard profile since 8.0 ka B.P. in this region.
Related Articles |