Soil Biological and Chemical Properties in Restored Perennial Grassland in California

摘要: Restoration of California native perennial grassland is often initiated with cultivation to reduce the density and cover non-native annual grasses before seeding perennials. Tillage known adversely impact agriculturally cultivated land; thus changes in soil biological functions, as indicated by carbon (C) turnover C retention, may also be negatively affected these restoration techniques. We investigated a restored fourth year after planting Nassella pulchra, Elymus glaucus, Hordeum brachyantherum ssp .c alifornicum for total nitrogen (N), microbial biomass C, respiration, CO2 concentrations atmosphere, surface efflux CO2, root distribution (0- 15-, 15- 30-, 30- 60-, 60- 80-cm depths). A comparison was made between untreated plots without plant still maintained tillage herbicide. In uppermost layer 15-cm depth), respiration were lower tilled, bare than soils, from surface. Root length near bunchgrasses at greater depths grass‐dominated areas; similar but less pronounced trend observed biomass. Few differences or chemical properties occurred below depth, except that depths, concentration atmosphere vegetation, possibly reduced production due lack respiration. Similar microbiological layers depth suggest deeper microbiota rely on more recalcitrant sources are removal layer, even 6 years. Without primary production, procedures extended periods herbicide applications led net losses during plant-free periods. However, 4 years grasses, activity nearly same former conditions represented grassland, suggesting high resilience temporary disturbance caused tillage.