01742naa a2200181 a 450000100080000000500110000800800410001902400410006010000190010124501120012026000090023252012100024165000190145165000130147065300130148370000200149677300440151615216172024-01-08       1975    bl uuuu     u00u1 u    #d7 ahttps://doi.org/10.2307/19353052DOI1 aWIEGERT, R. G.  aAnnual production and disappearance of destritus on three South Carolina old fields.h[electronic resource]  c1975  aAbstract: Aboveground vegetative production was measured for two consecutive years in three South Carolina old fields beginning with a 1—yr mixed forb field, a 12—yr broomsedge (Andropogon) field, and a 12—yr Lespedeza field. Vegetative production was periodically harvested and corrected for mortality between sampling periods. Total aboveground production by the vegetation was mixed forb, 1,321 and 1,447 kcal/m2; broomsedge, 898 and 1,297 kacl/m2; and lespedeza, 4,467 and 4,490 kcal/m2 for the 2 yr, respectively. Close approximations of the annual vegetative production by each field were obtained by multiplying the average annual standing crop of detritus by the mean annual detritus disappearance rate. Summing the maximum standing crops of each species, a practice often used to avoid underestimation of the annual production, may in some circumstances lead to serious overestimation of production. Comparisons of specific productivity parameters determined for the three South Carolina fields with those determined for a 30—yr—old field in Michigan differed widely between all four fields except for the ratios of total vegetative production/maximum standing crops of green materials.  aDecomposição  aPastagem  aRestolho1 aMCGINNIS, J. T.  tEcologygv. 56, n. 1, p. 129-140, 1975.