FIGURE 6.

Relationships between climate change, human subsistence, and proportions of fruit trees. (A) Quantitative reconstruction of Holocene temperature changes in the Northern Hemisphere (Marcott et al., 2013); (B) results of stable oxygen isotope measurements performed on ostracod values in sediment cores of Lake Qinghai (Liu X. Q. et al., 2007); (C) quantitative reconstruction of Holocene precipitation changes in northern China (Chen et al., 2015b); (D) pollen record of trees in sediment cores of Lake Qinghai (Liu et al., 2002); (E) normalized probability from radiocarbon dates of archeological sites in the NETP (5,500–2,000 BP); (F) proportions of fruit trees in the investigated sites in the NETP (green rectangles); (G) stable carbon isotope ratios (δ ¹³C) of human bones in the NETP and the adjacent Chinese Western Loess Plateau (Chen et al., 2015a).