【摘要】 本文应用¹⁵N示踪技术,在盆栽试验条件下,研究了新疆7种耕作土壤的供氮能力-A_N值,以及影响A_N值的某些因素。7种土壤A_N值的大小顺序为石河子潮土>水稻土>阿克苏潮土>灰钙土>灰漠土>棕钙土>灌淤土。土壤的A_N值与作物干物质产量、植株吸收总氮量、植株吸收土壤氮量以及土壤碱解氮含量有明显相关性（P<0.01）。供试作物种类对土壤A_N值有较大的影响,同一土壤上,种植甜菜所测得的A_N值明显高于种植其他作物测得的A_N值。更多还原

【Abstract】 The capacity of nitrogen supply in 7 kinds of soil and ralative factors in the semiarid zone in Xinjiang （Brown Calcium soil-BC, Grey Calcium soil-GC, Grey Desert soil-GD, Snihezhi Moisture Meadow soil-SM, Akeshu Moisture Meadow soil-AM, Paddy soil-P, and Warping soil-W） were studied by using ¹⁵N pot experiment for two years.The results are as follows:1.A_N values of 7 kinds of soil are 91-106 mgN/kg soil for BC, 102-134 mgN/kg soil for GC, 93-122 mgN/kg soil for GD, 290-316 mgN/kg soil for SM, 121-135 mgN /kg soil for AM, 165-169 mgN/kg soil for P, 93-98 mgN/kg soil for W. The order is: SM>P>AM>GC>GD>BC>W.2.A_N values of the above soils show significant correlation with the dry-matter yield of plants, the total amount of nitrogen absorbed by plants, the amount of soil nitrogen absorbed by plants and alkalizable nitrogen in the soil The higher the soil fertility is, the more the soil nitrogen is absorbed by plants. In the experiment, the amont of soil nitrogen absorbed from SM by plants is 2-3 times as much as from the others.3.A_N values vary significantly with crops grown in the same soil. Among the five crops, A_N values determinated in sugar beets is higher than those of the others. In the experiment, it has not significant effects on A_N values to supply different rates of urea nitrogen fertilizers.4.A_N values in the soil sampled and left alone for a year increase.更多还原