Table 2.
Spearman correlation coefficients between soil physicochemical properties across all samples.
| TOC | TN | TP | TK | NN | AN | AP | TS | pH | |
|---|---|---|---|---|---|---|---|---|---|
| TOC | 1.000 | ||||||||
| TN | 0.792** | 1.000 | |||||||
| TP | 0.163 | 0.193 | 1.000 | ||||||
| TK | 0.171 | 0.333 | 0.067 | 1.000 | |||||
| NN | 0.356 | 0.277 | − 0.149 | − 0.079 | 1.000 | ||||
| AN | − 0.200 | − 0.269 | − 0.448* | 0.012 | 0.031 | 1.000 | |||
| AP | 0.568** | 0.639** | 0.271 | 0.472* | 0.069 | − 0.230 | 1.000 | ||
| TS | 0.411* | 0.232 | 0.004 | 0.125 | 0.287 | − 0.031 | 0.073 | 1.000 | |
| pH | 0.038 | 0.149 | 0.002 | 0.129 | 0.077 | 0.047 | 0.213 | − 0.390* | 1.000 |
Spearman correlation table is drawn based on SPSS (SPSS 19.0; IBM Inc., Armonk, USA)85.
TS total salt content, AP available phosphorus content, AN ammonium nitrogen content, NN nitrate nitrogen content, TP total phosphorus content, TN total nitrogen content, TK total potassium content, TOC total organic carbon content.
r-value represents Spearman correlation coefficient, between − 1 and 1, r < 0 is negative correlation, r > 0 is positive correlation *p < 0.05, **p < 0.01.