Nitrogen Fertilization Restructured Spatial Patterns of Soil Organic Carbon and Total Nitrogen in Switchgrass and Gamagrass Croplands in Tennessee USA.

ABSTRACT: Nitrogen (N) fertilizers can potentially alter spatial distribution of soil organic carbon (SOC) and total nitrogen (TN)  concentrations in croplands such as switchgrass (SG: Panicum virgatum L.) and gamagrass (GG: Tripsacum dactyloides L.), but it remains unclear whether these effects are the same between crops and under different rates of fertilization. ¹³C and ¹⁵N are  two important proxy measures of soil biogeochemistry, but they were rarely examined as to their spatial distributions in soil. Based on a three-year long fertilization experiment in Middle Tennessee, USA, the top mineral horizon soils (0-15 cm) were collected using a spatially explicit design within two 15-m² plots under three fertilization treatments in SG and GG croplands. A total of 288

SUBMITTER: Li J 

PROVIDER: S-EPMC6985139 | biostudies-literature | 2020 Jan

REPOSITORIES: biostudies-literature