StateKeyLaboratoryofSoilErosionandDrylandAgricultureontheLoessPlateau;
InstituteofSoilandWaterConservation;
TheChineseAcademyofSciences;
Yangling712100;
P.R.China;
NorthwesternAgriculturalResearchCenter;
MontanaStateUniversity;
4570Montana35;
KalispellMT59901;
USA;