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1 研究材料与方法选择代表加拿大亚伯达地区土壤特点的6个试验样地(5个旱地、1个水浇地),样地的基本情况见表1.各样地原作物种类:LD和TB是小麦休闲;LI是禾
MATERIALS AND METHODS Selection of 6 plots (5 drylands and 1 irrigated land) representative of the soil characteristics of Alberta, Canada, are summarized in Table 1. The original crop types were LD and TB is wheat recreation; LI is Wo