Soil physical and chemical properties, soil temperature and humidity, and companion species in four habitats (Experiment 2)
Soil physical and chemical properties showed little difference among different habitats; however, the soil total nitrogen levels in farmland ecotones and roadsides were higher and lower, respectively, than those in other habitats. The contents of available phosphorus and available potassium in grasslands were lower than those in other habitats. Soil organic matter content in grasslands was higher than that in other habitats (Table 1).
In SP, the soil temperature of farmland was significantly higher than in other habitats, and that of grassland was significantly lower than in other habitats; in GP, the soil temperatures of grassland and roadside were significantly lower than those of other habitats; in FFP, the roadside temperature was significantly lower than those of other habitats. The soil moisture in different habitats showed significant differences in different periods, and the values of soil moisture were ranked as follows: grassland > farmland ecotone> residential area> roadside (Fig. 3).
The types of companion species in farmland ecotones, residential areas and roadsides were similar and quite different from those of grassland (Table 2).