Table 4. General information on Rice cropping system, Life span, Total annual rainfall (mm), Annual accumulated temperature (≥10°C), Area (kha) and Production (kt) for the study areas.

Provinces	Climate region	Rice cropping system	Life span	Total annual rainfall (mm)	Annual accumulated temperature (≥10 °C)	Planting Area in 2009(kha)	Percent age of China (%)	Production in 2009 (kt)	Percenta ge of China (%)
Heilongjiang (HLJ)	Temperate continental monsoon climate	Single cropping	May – Oct	450–650	2000–3700	2460.80	8.31	15745.00	8.07
Hunan (HN)	Subtropical monsoon climate	Double cropping	Mar – Aug, Jun – Nov	1200–1700	4500–6500	4047.20	13.66	25786.00	13.22
Jiangxi (JX)	Subtropical monsoon climate	Double cropping	Mar – Aug, Jun - Nov	1300–2000	4500–6500	3282.10	11.08	19059.00	9.77
Sichuan (SC)	Subtropical humid climate	Single cropping	Mar - Aug	950–1200 (Sichuan Basin)	4000–6000 (Sichuan Basin)	2027.10	6.84	15202.00	7.79
Guangxi (GX)	Subtropical monsoon climate	Double cropping	Mar – Aug, Jun - Nov	1300–2000	5800–9300	2125.00	7.17	11459.00	5.87