Effects of Post-1980 Warming on Cropping Systems in China
Dong, J., Liu, J., Tao, F., Xu, X. and Wang, J. 2009. Spatio-temporal changes in annual accumulated temperature in China and the effects on cropping systems, 1980s to 2000. Climate Research 40: 37-48.
Resuls indicate that "since the late 1980s, AAT10 has noticeably risen in most of China." More specifically, Dong et al. indicate that 1.22 x 1015 km2 of land moved from the potato accumulated temperature zone (ATZ) to the spring wheat ATZ, that 3.16 x 1015 km2 of land moved from the spring wheat ATZ to the winter wheat ATZ, and that 1.64 x 1015 km2 of land moved from the winter wheat ATZ to the rice ATZ. In addition, they determined that "because of improved thermal conditions since the late 1980s," farmers changed from a single crop per year to three crops in two years in many regions, while "the growth boundary of winter wheat moved northward."
With respect to the cropping index, which they define as the number of crops grown per year on a given area of land, the researchers from the Chinese Academy of Sciences state that "as a result of climate warming on a national scale, it is feasible for the cropping index to improve," and they report that, indeed, "cropping indices have improved in many regions since the 1980s," citing the studies of Yan et al. (2005) and Li et al. (2008). And because of this fact, they indicate that "to acquire higher yields of food and income, people have improved the cropping index in regions that had previously been difficult to crop and also in some areas where the index was low."
As a result, and in response to the past century's unprecedented increases in the twin evils of the radical environmentalist movement, it can be appreciated that rising levels of both the atmosphere's temperature and CO2 concentration have not in any way hurt the people of China. Quite to the contrary, in fact, they have actually improved the country's capacity to provide the great quantities of food needed to support its vast population.
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