气候变化对北京地区小麦玉米两熟种植制度的影响

程延年

The Influence of Climatic Variation on the Double Cropping System of Winter Wheat and Maize in Beipng Region

Cheng Yannian

华北农学报 . 1994, (1): 18 -24 . DOI: 10.3321/j.issn:1000-7091.1994.01.004