StateKeyLaboratoryofSoilErosionandDrylandAgricultureontheLoessPlateau;
InstituteofSoilandWaterConservation;
theChineseAcademyofSciences;
Yangling712100;
China//ChinaAgriculturalUniversity;
Beijing100083;
China;
AgriculturalResearchCenter;
MontanaStateUniversity;
KalispellMT59901;
USA;