Research reveals that humans have changed natural vegetation six thousand years ago2018-11-13 20:25:32 133 ℃
This newspaper (reporter Huang Xin) Tongji University professor Weng Chengyu and PhD student Cheng Zhongjing found that at least in South China, humans were five or six thousand years ago. It has substantially changed the succession and evolution process of natural vegetation. This is the first time in the world that the strong evidence of early humans' natural ecosystems has been revealed with solid evidence. It also means that natural vegetation may have been changed as early as 6,000 years ago, or that true natural vegetation is no longer there. The results were recently published online in Nature-Earth Science.
Spores and pollen deposited in the ocean can reflect the evolution of terrestrial vegetation in the source area. The researchers analyzed several typical interglacial periods similar to today's warm environments and found similar vegetation. Evolution: In the early days, tropical coniferous forest components expanded rapidly, and temperate and subtropical pines decreased accordingly. By the end of the warm period, pines have prospered and tropical components have been reduced. This process is synchronized with changes in ocean surface temperature, starting at a sea surface temperature of 27 degrees Celsius, indicating temperature control.
However, in the current warm period, the expansion of the tropical component was interrupted and soon attenuated, and Song also recovered from expansion to recovery and expansion, and quickly reached its peak.
"This turn occurred about 6,000 years ago, when there was a high peak of charcoal that was closely related to human fire." Weng Chengyu said that the results of this study showed that the role of early human activities was It is greatly underestimated that the substantive impact of human beings is much earlier than the past.
Related paper information: DOI:10.1038/s41561-018-0250-1
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