Table 1.
Effect of precipitation and cropping system of invasive and native weeds on soil TOC content and soil pH
| Treatments | TOC | Soil pH | |||||
|---|---|---|---|---|---|---|---|
| Precipitation level (P) | Aug | Oct | Dec | Aug | Oct | Dec | |
| PL | 8.29B | 17.0 A | 18.7B | 7.29B | 7.34B | 7.45 A | |
| PN | 10.1 A | 17.7 A | 20.3 A | 7.37 A | 7.43 A | 7.37B | |
| PH | 7.34 C | 15.7B | 19.1B | 7.36 A | 7.41 A | 7.44 A | |
| Cropping system (CS) | |||||||
| CK | 7.79B | 16.4B | 16.7 C | 7.33 | 7.38 | 7.42AB | |
| SC | 10.7 A | 18.1 A | 21.0 A | 7.31 | 7.36 | 7.37B | |
| WC | 7.65B | 16.3B | 19.9B | 7.33 | 7.38 | 7.41AB | |
| SC × WC | 8.16B | 16.5B | 20.0B | 7.39 | 7.44 | 7.47 A | |
| Interaction (P × CS) | |||||||
| PL | CK | 6.97f | 15.6ef | 15.9 | 7.19e | 7.24e | 7.44bc |
| PL | SC | 9.19b | 18.0b | 19.2 | 7.31 cd | 7.36 cd | 7.33 cd |
| PL | WC | 8.14cde | 16.9 cd | 20.4 | 7.31 cd | 7.36 cd | 7.44bc |
| PL | SC × WC | 8.85bc | 17.5bc | 19.5 | 7.35 cd | 7.39 cd | 7.58a |
| PN | CK | 8.17bcde | 17.0bcd | 17.1 | 7.33 cd | 7.39 cd | 7.26d |
| PN | SC | 16.3a | 21.4a | 24.5 | 7.27de | 7.33de | 7.38 cd |
| PN | WC | 7.73cdef | 16.4cde | 19.4 | 7.38bc | 7.43bc | 7.38 cd |
| PN | SC × WC | 8.22bcde | 16.1def | 20.3 | 7.51a | 7.58a | 7.45bc |
| PH | CK | 8.22bcd | 16.5cde | 17.0 | 7.47ab | 7.52ab | 7.56ab |
| PH | SC | 6.65f | 15.0f | 19.4 | 7.35 cd | 7.40 cd | 7.40c |
| PH | WC | 7.08ef | 15.6ef | 20.0 | 7.30 cd | 7.36 cd | 7.41c |
| PH | SC × WC | 7.41def | 15.7def | 20.1 | 7.31 cd | 7.35 cd | 7.39c |
| ANOVA | DF | P | P | P | P | P | P |
| P | 2 | 32.0** | 11.4** | 16.7*** | 5.74* | 6.80* | 6.80* |
| CS | 3 | 57.2*** | 19.8*** | 208** | 2.78NS | 2.50NS | 3.10* |
| P × CS | 6 | 56.5*** | 21.6*** | 45.7NS | 7.04*** | 7.40*** | 5.20*** |
Lowercase letters indicate significant for the interaction of precipitation levels and cropping system variability (p < 0.05)0.2 Uppercase letters indicate variability between nutrient levels and cropping system (p < 0.05). low precipitation (PL), normal precipitation (PN) and high precipitation (PH); control (CK); pot having no plant, invasive S. canadensis mono-cropping (SC), native Wedelia chinesis mono-cropping (WC) and invasive + native intercropping system (WC × SC)