Trends in Moisture Index, Farmland Area, and Their Combined Effects on Grain Production in Northern China

Table 5

Grain production changes from farmland conversion from the late 1980s to 2008.

Humid zone	Grain production change
	Conversion of farmland to urban areas		Conversion of farmland to other land		Conversion of other land uses to farmland
	Tons	Percent (%)	Tons	Percent (%)	Tons	Percent (%)
Humid	−14,593,629	−76.4	−38,795,588	−67.2	46,928,732	58.9
Semiarid	−3,305,860	−17.3	−12,558,400	−21.7	17,639,600	22.1
Arid	−1,205,870	−6.3	−6,411,010	−11.1	15,108,800	19.0
Total	−19,105,359	100	−57,764,998	100	79,677,132	100