Soil and Plant Tissue Analysis of Sericea Lespedeza (Lespedeza cuneata) Invasion Around Lake Issaqueena, SC.

Sericea lespedeza (Lespedeza cuneata), an exotic invasive plant, is native to Japan. This study was conducted to determine the chemical composition of sericea lespedeza as well as soil and landscape characteristics that correlate with invasion of sericea lespedeza around Lake Issaqueena, SC. Geographic Information Systems (GIS) and Light Detection and Ranging (LiDAR) were used to determine the pattern of invasion and to quantify landscape metrics. Plant and soil chemical properties were measured to determine the elemental cycling. Sericea lespedeza was distributed on both sides of the lake in Pacolet and Madison soil map units (Fine, kaolinitic, thermic Typic Kanhapludults) on average slopes of 17.5%. It was particularly common along roads and trails with a preferred mean canopy cover of <50%. Plant tissue analysis revealed statistically higher concentrations of macronutrients (N, P, K, Mg, Ca and S) and selected micronutrients (S and B) in leaves compared to stems and roots. In contrast, micronutrients (Cu, Mn and Fe) were significantly higher in stems and roots. Chemical composition of the above-ground biomass was comparable to other common forages. Soil analysis results showed no statistical difference between control and invaded plots for measured soil chemistry parameters. Lake watersheds maybe particularly susceptible to the invasion of Sericea lespedeza due to microclimate and recreational use.