英语科普：新石器时代人是最早的伐木工
时间：2012-08-11 06:16:29
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During the
Neolithic1 Age（新石器时代） (approximately 10000-6000 BCE), early man evolved from hunter-gatherer to farmer and agriculturalist, living in larger, permanent settlements with a variety of
domesticated2 animals and plant life. This transition brought about significant changes in terms of the economy, architecture, man's relationship to the environment, and more. Now Dr. Ran Barkai of Tel Aviv University's Department of
Archaeology3 and Ancient Near Eastern Civilizations has shed new light on this
milestone4 in human evolution, demonstrating a direct connection between the development of an agricultural society and the development of woodworking tools.
"Intensive woodworking and tree-felling was a phenomenon that only appeared with the
onset5 of the major changes in human life, including the transition to agriculture and permanent villages," says Dr. Barkai, whose research was published in the journal PLoS One. Prior to the Neolithic period, there is no evidence of tools that were powerful enough to cut and carve wood, let alone fell trees. But new archaeological evidence suggests that as the Neolithic age progressed, sophisticated carpentry developed alongside agriculture.
Evolution of axes
The use of
functional7 tools in relation to woodworking over the course of the Neolithic period has not been studied in detail until now. Through their work at the archaeological site of Motza, a neighbourhood in the Judean Hills, Dr. Barkai and his fellow researchers, Prof. Rick Yerkes of Ohio State University and Dr. Hamudi Khalaily of the Israel
Antiquity8 Authority, have
unearthed9 evidence that increasing sophistication in terms of carpentry（木工手艺） tools corresponds with increased agriculture and permanent settlements.
The early part of the Neolithic age is divided into two distinct eras -- Pre-Pottery Neolithic A (PPNA) and Pre-Pottery Neolithic B (PPNB). Agriculture and domesticated plants and animals appear only in PPNB, so the transition between these two periods is a
watershed10 moment in human history. And these changes can be tracked in the woodworking tools which belong to each period, says Dr. Barkai.
Within PPNA, humans remained gatherers but lived in more permanent settlements for the first time, he says. Axes associated with this period are small and delicate, used for light carpentry but not suited for felling trees or other massive woodworking tasks. In PPNB, the tools have evolved to much larger and heavier axes, formed by a technique called polishing. The researchers' in-depth analysis of these tools shows that they were used to cut down trees and complete various building projects.
"We can document step by step the transition from the absence of woodworking tools, to delicate woodworking tools, to heavier woodworking tools," Dr. Barkai says, and this follows the "actual transition from the hunter-gatherer lifestyle to agriculture." He also identifies a trial-and-error phase during which humans tried to create an axe6 strong enough to undertake larger woodworking tasks. Eventually, they succeeded in creating a massive ground stone axe in PPNB.
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