As a joint researcher of the Group for Integrated Survey of the Loess Plateau, Chinese Academy of Sciences (CISLP, CAS), the first author participated in investigation and data collection for a project, Rational Utilization of Agricultural Climate Resources in the Loess Plateau, during 1986–91, which enabled us to conduct this research. Thanks are also due to the Toka Foundation of Education and Cultural Exchange, Japan, which provided financial aid for this project.
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