Table 1 Basic information of flue-cured tobacco planting sites.

Sites	Jianshui (JS)	Luxi (LX)	Mile (ML)	Shiping (SP)
Elevation	1217–2051	1491–2071	1206–2154	1380–2198
Longitude	23.39–24.05	24.19–24.72	23.90–24.56	23.40–24.03
Latitude	102.38–103.13	103.39–104.01	103.16–103.63	102.22–102.67
Soil type	Red soil, yellow soil, paddy soil	Red soil, yellow soil, paddy soil	Red soil, yellow soil, clay soil, purple soil	Red soil, yellow soil, paddy soil
Tobacco area (ha)	5866.67	11,866.67	11,866.67	6833.33
Tobacco area ratio (%)	13.04	26.37	26.37	15.19
Field rainfall (mm)	573.38 ± 4.47	662.01 ± 3.73	579.13 ± 1.30	589.45 ± 5.18
Field temperature (℃)	18.1 ± 0.16	14.8 ± 0.10	16.5 ± 0.19	17.1 ± 0.23
Field sunshine hours (h)	623.40 ± 1.01	605.14 ± 0.82	625.11 ± 0.37	626.04 ± 0.76
Field relative abundance (%)	76.60 ± 0.05	78.81 ± 0.04	77.25 ± 0.05	76.97 ± 0.03
Clay (%)	54.46 ± 2.25	61.42 ± 1.26	59.18 ± 1.20	55.24 ± 2.38
pH	6.19 ± 0.16	6.69 ± 0.10	6.29 ± 0.11	5.52 ± 0.15
SOM (g/kg)	19.80 ± 1.81	25.65 ± 1.25	24.40 ± 1.16	23.78 ± 1.40
AN (mg/kg)	90.35 ± 7.82	102.47 ± 4.60	105.85 ± 4.49	109.17 ± 6.53
AP (mg/kg)	32.59 ± 5.01	30.78 ± 3.02	31.64 ± 3.45	37.45 ± 5.69
AK (mg/kg)	203.57 ± 16.84	218.60 ± 11.34	201.60 ± 10.16	188.72 ± 14.26
CL^-1 (mg/kg)	11.78 ± 2.39	5.69 ± 0.67	7.69 ± 0.77	12.00 ± 1.74

The elevation, the longitude and the latitude is the range value of the sampling samples in Jianshui (JS), Luxi (LX), Mile (ML) and Shiping (SP) these four study sites. Soil type is determined by the classification of Chinese Soil Taxonomy (CST); Tobacco area is the planting area of flue-cured tobacco in Jianshui (JS), Luxi (LX), Mile (ML) and Shiping (SP) these four study sites; Tobacco area ratio is the proportion of the above planting areas that accounted for the total planting area in Hani-Yi Autonomous Prefecture of Honghe in 2015; the field rainfall, field temperature, field sunshine hours and field relative humidity mean the variation of rainfall, temperature, sunshine hours and relative humidity in the field time (from May to August). Soil clay, soil pH, soil organic matter (SOM), soil alkali-hydrolyzed nitrogen (AN), soil available phosphorus (AP), available potassium (AK) and soil chlorine content (SCL), these data in the table are the means ± standard error.

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