Table 1 Significant impact factors list.
Sequence number | Ecological factors | Abbreviation | Correlation coefficient ofatractylodin content |
|---|---|---|---|
1 | Soil type(based on FAO-90) | SoilType | 0.530 |
2 | Soil clay content(0–30 cm topsoil) | SoilClay | 0.519 |
3 | Soil organic carbon content(0–30 cm topsoil) | SoilCarbon | 0.465 |
4 | The mean precipitation in May | Prec5 | 0.449 |
5 | Cation exchange capacity of the soil(0–30 cm topsoil) | SoilCation | 0.444 |
6 | The mean precipitation in October | Prec10 | 0.441 |
7 | Seasonal precipitation variation coefficient | PrecVari | 0.377 |
8 | Soil available water content level | SoilWater | 0.351 |
9 | The mean precipitation in April | Prec4 | 0.346 |
10 | Aspect | Aspect | 0.301 |
11 | The mean precipitation in September | Prec9 | 0.295 |
12 | Mean annual precipitation | PrecAnnu | 0.289 |
13 | Standard deviation of the seasonal changes in temperature | TempDevi | 0.283 |
14 | Humid index | HI | 0.273 |
15 | The range of mean annual temperature | TempRange | 0.265 |
16 | Monthly mean of temperature difference between day and night | TempDiff | 0.255 |
17 | The mean precipitation in March | Prec3 | 0.247 |
18 | The mean precipitation in November | Prec11 | 0.244 |
19 | The mean temperature in December | Tmean12 | 0.233 |
