FcAtm.from.Dataframe: no visible binding for global variable
  'splinefun'
GaudinskiModel14 : LitterFlux: no visible global function definition
  for 'spline'
GaudinskiModel14 : RootFlux: no visible global function definition for
  'spline'
GaudinskiModel14 : fX: no visible global function definition for
  'spline'
MeanAge2: no visible global function definition for 'splinefun'
MeanAge3: no visible global function definition for 'pdf'
MeanAge3: no visible global function definition for 'splinefun'
MeanAge3 : E: no visible global function definition for 'splinefun'
MeanAge3 : E: no visible global function definition for 'integrate'
MeanAge3: no visible global function definition for 'dev.off'
MeanTT: no visible global function definition for 'splinefun'
MeanTT : p: no visible global function definition for 'integrate'
MeanTT: no visible global function definition for 'lines'
MeanTT: no visible global function definition for 'legend'
OnepModel: no visible global function definition for 'splinefun'
OnepModel14 : inputFlux: no visible global function definition for
  'spline'
OnepModel14 : fX: no visible global function definition for 'spline'
RothCModel: no visible global function definition for 'splinefun'
ThreepFeedbackModel: no visible global function definition for
  'splinefun'
ThreepFeedbackModel14 : inputFlux: no visible global function
  definition for 'spline'
ThreepFeedbackModel14 : fX: no visible global function definition for
  'spline'
ThreepParallelModel : inputrate: no visible global function definition
  for 'spline'
ThreepParallelModel : fX: no visible global function definition for
  'spline'
ThreepParallelModel14 : inputrate: no visible global function
  definition for 'spline'
ThreepParallelModel14 : fX: no visible global function definition for
  'spline'
ThreepSeriesModel: no visible global function definition for
  'splinefun'
ThreepSeriesModel14 : inputFlux: no visible global function definition
  for 'spline'
ThreepSeriesModel14 : fX: no visible global function definition for
  'spline'
TimeMap.from.Dataframe: no visible binding for global variable
  'splinefun'
TwopFeedbackModel: no visible global function definition for
  'splinefun'
TwopFeedbackModel : fX: no visible global function definition for
  'spline'
TwopFeedbackModel14 : inputFlux: no visible global function definition
  for 'spline'
TwopFeedbackModel14 : fX: no visible global function definition for
  'spline'
TwopParallelModel : inputrate: no visible global function definition
  for 'spline'
TwopParallelModel : fX: no visible global function definition for
  'spline'
TwopParallelModel14 : inputrate: no visible global function definition
  for 'spline'
TwopParallelModel14 : fX: no visible global function definition for
  'spline'
TwopSeriesModel: no visible global function definition for 'splinefun'
TwopSeriesModel14 : inputFlux: no visible global function definition
  for 'spline'
TwopSeriesModel14 : fX: no visible global function definition for
  'spline'
Yasso07Model: no visible global function definition for 'splinefun'
YassoModel: no visible global function definition for 'splinefun'
linesCPool: no visible global function definition for 'lines'
plotAndCheck: no visible global function definition for 'pdf'
plotAndCheck: no visible global function definition for 'dev.off'
plotC14Pool: no visible global function definition for 'lines'
plotCPool: no visible global function definition for 'lines'
res2fun: no visible global function definition for 'splinefun'
turnoverFit: no visible binding for global variable 'IntCal13'
turnoverFit: no visible binding for global variable 'Hua2013'
turnoverFit: no visible global function definition for 'tail'
turnoverFit: no visible global function definition for 'optimize'
turnoverFit: no visible global function definition for 'par'
turnoverFit: no visible global function definition for 'points'
turnoverFit: no visible global function definition for 'lines'
turnoverFit: no visible global function definition for 'legend'
turnoverFit: no visible global function definition for 'curve'
turnoverFit: no visible global function definition for 'abline'
BoundFc,data.frame-missing-missing-missing-character-missing: no
  visible binding for global variable 'splinefun'
BoundFc,data.frame-missing-missing-numeric-character-missing: no
  visible binding for global variable 'splinefun'
BoundInFlux,data.frame-missing-missing-missing-missing: no visible
  binding for global variable 'splinefun'
computeResults,MCSim : singleThreadParticleSimulator: no visible global
  function definition for 'integrate'
computeResults,MCSim : singleThreadParticleSimulator: no visible global
  function definition for 'runif'
getAccumulatedRelease,Model: no visible global function definition for
  'splinefun'
getMeanTransitTime,ConstLinDecompOp: no visible global function
  definition for 'splinefun'
getMeanTransitTime,ConstLinDecompOp: no visible global function
  definition for 'integrate'
initialize,BoundFc: no visible binding for global variable 'splinefun'
initialize,NlModel: no visible global function definition for
  'TransportDecompositionOperator.new'
Undefined global functions or variables:
  Hua2013 IntCal13 TransportDecompositionOperator.new abline curve
  dev.off integrate legend lines optimize par pdf points runif spline
  splinefun tail
Consider adding
  importFrom("grDevices", "dev.off", "pdf")
  importFrom("graphics", "abline", "curve", "legend", "lines", "par",
             "points")
  importFrom("stats", "integrate", "optimize", "runif", "spline",
             "splinefun")
  importFrom("utils", "tail")
to your NAMESPACE file.