Crop Yield and Temperature Changes in North China during 601–900 AD

Table 1

The provincial crop taxes recorded in 749 AD [28].

Provinces	Jingji	Guannei	Henan	Hebei	Hedong	Huainan	Shannan	Longyou
Crop taxes (Dan*)	6688,110	8650,645	22467,641	21029,894	18544,405	5610,276	3064,740	763,868
Proportions (%)	7.70	9.96	25.88	24.22	21.36	6.46	3.53	0.88

Note. *Dan is an ancient weight unit of grain in China.