Determination of production regions for pollution-free Chinese medicinal materials by geographic information system: Achyranthes bidentata (Niu Qi) in Tianjin as an example

Table 2 Ecological suitability of A. bidentata

Climate factors	AT (°C)	AAT (°C)	MTJA (°C)	TLTJ (°C)	MTJ (°C)	THTJ (°C)	AARH (%)	AASH (h)	AAP (mm)
	1200.7 ~ 8254.0	12.4 ~ 28.0	-3.8 ~ 17.4	-9.3	14.9 ~ 29.2	34.1	60.4 ~ 85.0	1047 ~ 2190	521 ~ 1803
Soil types	Crimson soil, red, yellow soil, yellow brown soil, and brown soil, brown, dark brown.

Note: AT (accumulated temperature exceeding 10°C); AAT (annual average temperature); MTJA (mean temperature in January); TLTJ (the lowest temperature in January); MTJ (mean temperature in July); THTJ (the highest temperature in July); AARH (annual average relative humidity); AASH (annual average sunshine hours); AAP (average annual precipitation).

ISSN: 1749-8546