3.2 Effects of soil water content and soil nutrient content on invasion by P. kansuensis
The RR value represents the response rate for P. kansuensisinvasion shown by the environment. The results showed that the response rate was significant for soil organic carbon (SOC), soil nitrogen (SN), and soil phosphate (SP); extremely significant for SW; but not significant for soil potassium (SK). Our results indicated that SW and soil nutrient content were the main factors determining invasion byP. kansuensis and that SW plays the most important role (Fig. 2).